Synthesis and structure of an aryl­selenenium(II) cation, [C34H41N4Se+]2[Hg(SeCN)4]2−, based on a 5-tert-butyl-1,3-bis­(1-pentyl-1H-benzimidazol-2-yl)benzene scaffold

Rani, V.; Singh, H.B.; Butcher, R.J.

doi:10.1107/S2056989018006394

research communications

CRYSTALLOGRAPHIC
COMMUNICATIONS

ISSN: 2056-9890

Volume 74| Part 6| June 2018| Pages 786-790

https://doi.org/10.1107/S2056989018006394

Open

access

Synthesis and structure of an arylselenenium(II) cation, [C₃₄H₄₁N₄Se⁺]₂[Hg(SeCN)₄]²⁻, based on a 5-tert-butyl-1,3-bis(1-pentyl-1H-benzimidazol-2-yl)benzene scaffold

Varsha Rani,^a Harkesh B. Singh ^a and Ray J. Butcher ^b ^*

^aDepartment of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India, and ^bDepartment of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
^*Correspondence e-mail: rbutcher99@yahoo.com

Edited by M. Zeller, Purdue University, USA (Received 16 March 2018; accepted 25 April 2018; online 15 May 2018)

In the title salt, bis{[5-tert-butyl-1,3-bis(1-pentyl-1H-benzimidazol-2-yl)benzene]selenium} tetrakis(selenocyanato)mercury, (C₃₄H₄₁N₄Se)₂[Hg(SeCN)₄], the arylselenenium cations, [C₃₄H₄₁N₄Se]⁺, are linked through [Hg(SeCN)₄]²⁻ anions by C—H⋯N hydrogen bonds. In the cation, the geometry around the Se atom in the 5-tert-butyl-1,3-bis(1-pentyl-1H-benzimidazol-2-yl)benzene scaffold is T-shaped, resulting from the coordination of Se by the C atom of the central aromatic ring and the N atoms of both of the benzimidazole moieties. The trans Se—N bond lengths are almost equal [2.087 (3) and 2.099 (3) Å] and the Se—C bond length is 1.886 (3) Å. The N—Se—N angle is 159.29 (11)°. The geometry around the Hg^II atom in the [Hg(SeCN)₄]²⁻ anion is distorted tetrahedral, with Se—Hg—Se angles ranging from 88.78 (3) to 126.64 (2)°. In [Hg(SeCN)₄]²⁻, the Hg—Se bonds are unsymmetrical [2.5972 (4) and 2.7242 (5) Å]. One of the pentyl substituents is disordered over two equivalent conformations, with occupancies of 0.852 (8) and 0.148 (8).

Keywords: crystal structure; arylselenenium(II) cation; tetraselenocyanatemercury(II) anion.

CCDC reference: 1839609

1. Chemical context

Over the past two decades, organochalcogen chemistry has gained the attention of synthetic chemists because of its promising utility in biomimetic chemistry (Mugesh & Singh, 2000 ; Zhao et al., 2012 ; Bhuyan & Mugesh, 2012 ), synthetic organic chemistry (Back 1999 ; Singh & Wirth, 2012 ; Chivers & Laitinen, 2015 ) and material science (Manjare et al., 2014 ; Kremer et al., 2015 ). The first stable selenenium cation complex, [2,6-(Me₂NCH₂)₂C₆H₃Se]⁺[PF₆]⁻, was isolated while attempting the synthesis of the respective oxides from the reaction of 2,6-bis[(dimethylamino)methyl]phenyl methyl selenide with t-BuOCl (Fujihara et al., 1995 ). In the literature, examples of arylselenenium(II) cations are limited to a basic scaffold, the [2,6-bis(dimethylaminomethyl)phenyl]selenenium moiety, which is stabilized by different counter-anions [Cl⁻, Br⁻, I⁻ (Pop et al., 2014 ) and HF₂⁻ (Poleschner & Seppelt, 2004 )].

Our group has been active in the area of synthesis and isolation of novel, unstable arylchalcogen derivatives featuring intramolecular interactions (E⋯D; E = S, Se, Te and D = N, O) between chalcogen heteroatoms by using either one or two coordinating groups (Zade et al., 2004a ,b ; Selvakumar et al., 2011a ,b ,c ,d ; Singh et al., 2011 ; Prasad et al., 2016 ). Recently, and for the first time, we have shown the use of the bis-benzimidazole group to isolate an organometallic derivative of a non-transition metal where 1,3-bis(N-substituted benzimidazol-2′-yl)benzene has been used as a pincer ligand with chalcogens (Rani et al., 2018a ).

As far as the synthesis of transition metal complexes with the bis-benzimidazole group is concerned, there are several reports in the literature for platinum(II) pincer complexes with similar kinds of scaffolds. Some of these were investigated for their photoluminescence properties (Wang et al., 2014 ; Dorazco-González, 2014 ; Chan et al., 2016 ). Recently, we also reported some palladium(II) pincer complexes with a 1,3-bis(N-substituted benzimidazol-2′-yl)benzene-based ligand. In all the cases, we found that the transition metal complexes were quite stable and in no case was auto-ionization observed (Rani et al., 2018b ).

In an attempt to synthesize {4-(tert-butyl)-2,6-bis(1-pentyl-1H-benzo[d]imidazol-2-yl)phenyl}(selenocyanato)mercury (3), [4-tert-butyl-2,6-bis(1-pentyl-1H-benzimidazol-2-yl)phenyl]mercury(II) chloride (1) was reacted with potassium selenocyanate in 1,4-dioxane under reflux conditions. It was observed that, instead of the formation of the desired compound, the reaction leads to the isolation of an arylselenenium(II) cation via auto-ionization (Scheme 1). The procedure for the synthesis of complex 1 will be reported elsewhere. A plausible mechanism for the formation of complex 2 is shown in Scheme 2. Organomercury complex 1 reacts with potassium selenocyanate to form the desired product 3 with potassium chloride as a by-product. However, if complex II is unstable, mercury may be eliminated in elemental form via a reductive elimination pathway to form intermediate III. Strong secondary bonding interactions between Se⋯N atoms may facilitate auto-ionization and the formation of an arylselenenium cation with CN⁻ as the counter-anion IV. In the presence of a polar protic solvent, there is the possibility of decomposition of organomercury complex 1 to give the free ligand along with HgCl₂ and Hg(OMe)₂ as by-products.

HgCl₂ reacts with an excess of KSeCN to form K₂[Hg(SeCN)₄] (Space & Armeanu, 1930 ). Two selenenium cations can then associate with the [Hg(SeCN)₄]²⁻ anion to form complex 2. Since we only used one equivalent of potassium selenocyanate for the reaction, the product was obtained in low yield (11%).

2. Structural commentary

The title compound, 2, crystallizes in the monoclinic space group C2/c. The asymmetric unit contains a selenenium cation along with half of a [Hg(SeCN)₄]²⁻ anion with the Hg atom located on a crystallographic twofold axis (Fig. 1). In the cation, the coordination geometry around Se is T-shaped with each Se atom bonded to the central carbon atom of the aromatic ring and intramolecularly coordinated to the two N atoms. This coordination gives rise to a heptacyclic framework. The tetracyanoselenomercurate anion [Hg(SeCN)₄]²⁻ is sandwiched between two arylselenenium cationic units. The observed Se—C bond length is 1.886 (3) Å, which is comparable with that found for a NCN pincer-based selenenium cation [2,6-(Me₂NCH₂)₂C₆H₃Se]⁺[PF₆]⁻ (1.874 Å; Furukawa et al., 1995 ), and an OCN pincer-based selenenium cation [2-NO₂,6-(C₆H₅N=CH)C₆H₃Se]⁺[Br₃]⁻ (1.84 Å). The Se3—N1 and Se3—N2 bond lengths are almost equal [2.087 (3) and 2.099 (3) Å]. The Se—N distances are shorter than the sum of the van der Waals radii for Se and N [Σ_rvdw(Se,N) 3.45 Å] and longer than the covalent radii [Σ_rcov(Se,N) 1.91 Å] (Bondi, 1964 ). This implies stronger intramolecular Se⋯N interactions in the selenenium cation. The N1—Se3—N2 bond angle is found to be 159.29 (11)°. In related molecules (Rani et al., 2017a ,b ,c ), in the absence of coordinated Hg or Se atoms, the benzimidazole arms are twisted significantly out of the plane of the central phenyl ring. However, in the present structure, as a result of the interaction with Se, the two benzimidazole arms are almost in the plane of the central phenyl ring [dihedral angles of 3.10 (16) and 7.18 (19)°]. The Se atom is displaced by 0.116 (4) Å from the plane of the central phenyl ring. The atoms involved in the chelating system (N2, C11, C6, C1, C2, C11A, N1) form a plane (r.m.s deviation for fitted atoms of 0.0182 Å) with the Se in this plane [deviation from the plane of 0.011 (2) Å].

Figure 1
A view of the structure of the title compound, showing the atom-labelling scheme and the disorder in the pentyl side chain. Displacement ellipsoids are drawn at the 50% probability level. Symmetry code for generating equivalent atoms: 1 − x, y, $[{3\over 2}]$ − z.

In the anion, the mercury atom is coordinated by four selenocyanate anions (two are crystallographically unique) and the geometry around the mercury atom is distorted tetrahedral with Se—Hg—Se angles ranging from 88.78 (3) to 126.64 (2)°. The tetracyanoselenomercurate anion [Hg(SeCN)₄]²⁻ acts as a bridging moiety between two selenenium cationic units. The Se3⋯Se2(−x, −y, 1 − z) distance is 4.189 (2) Å and the C1—Se3⋯Se2(−x, −y, 1 − z) angle is 163.40 (9)°, which indicates that there is a weak secondary interaction between the two different kinds of Se atoms in the cation and anion (Se3 and Se2). In the [Hg(SeCN)₄]²⁻ anion, two sets of Hg—Se bonds exist. One set is shorter [2.5972 (4) Å] and the other set is longer [2.7242 (5) Å]. The Hg–SeCN moieties are not linear, with Hg—Se—C angles of 101.31 (14) and 101.43 (11)°.

3. Supramolecular features

In the crystal, the molecules are arranged in a parallel fashion along the b-axis direction as shown in Fig. 2. These parallel units are stacked together by C18—H18A⋯N1S and C18A—H18C⋯N2S interactions (numerical details are given in Table 1) and π–π stacking interactions between the benzimidazole rings (centroid–centroid distances = 3.535 Å).

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C18—H18A⋯N1Sⁱ	0.99	2.62	3.568 (5)	160
C18A—H18C⋯N2S	0.99	2.38	3.324 (8)	159
C18B—H18F⋯N2S	0.99	2.22	3.06 (6)	142
Symmetry code: (i) $[-x+{\script{1\over 2}}, y+{\script{1\over 2}}, -z+{\script{3\over 2}}]$ .

Figure 2
Packing diagram viewed along the b axis. C—H⋯N interactions linking the cations and anions are shown as dashed lines. Only the major disorder component is shown for clarity.

4. Database survey

There are no structural reports in the literature on a [phenylenebis(benzimidazole)]selenenium cation. However, there have been several reports of structures containing [Hg(SeCN)_x]²⁻ moieties [CICLOP, Brodersen et al. 1984 ; LENHES, Li et al., 2006a ; LENHES01, Sun et al., 2005 ; MURQOH, Li et al., 2006b ; PUMVAU, Kushch, et al., 1998 ; WUYGUU, Sun et al., 2013 ; YIHKUV, Shibaeva et al. 1994 ; YIHKUV01, Shibaeva et al. 1997 ]

5. Synthesis and crystallization

To a solution of 1 (0.2 g, 0.269 mmol) in 1,4-dioxane (30 ml) was added potassium selenocyanate (0.039 g, 0.270 mmol) dissolved in MeOH. The reaction mixture was stirred for 6 h under a nitrogen atmosphere and refluxed. The reaction mixture was filtered and the precipitate was washed with dioxane. Colourless prism-shaped crystals of 2 were obtained by layering a MeOH solution with diethyl ether at room temperature.

Yield 11% (0.058 g, 0.036 mmol); m. p. turned blackish after 423 K was reached. FT–IR (KBr) (cm⁻¹): 3059 (w), 2957 (s), 2931 (s), 2869 (s), 2124 (s, needle-like, C≡N), 1614 (m), 1464 (s), 1458 (s), 1440 (s), 1330 (w), 1288 (w), 1273 (w), 1154 (w), 1137 (w), 1011 (w), 892 (w), 746 (s). ESI–MS: m/z calculated for C₃₄H₄₁N₄Se: 585.2496. Found: 585.2552.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. The H atoms were positioned geometrically and allowed to ride on their parent atoms, with C—H distances ranging from 0.95 to 0.99 Å. U_iso(H) = xU_eq(C), where x = 1.5 for methyl H atoms and 1.2 for all other C-bound H atoms. One of the pentyl substituents is disordered with an occupancy ratio of 0.852 (8):0.148 (8). It was refined as two equivalent conformations using SAME and SIMU instructions (SAME 0.01 and SIMU 0.01).

Table 2
Experimental details

Crystal data
Chemical formula	(C₃₄H₄₁N₄Se)₂[Hg(CNSe)₄]
M_r	1789.84
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	100
a, b, c (Å)	12.7788 (15), 27.276 (3), 20.180 (3)
β (°)	95.591 (2)
V (Å³)	7000.4 (15)
Z	4
Radiation type	Mo Kα
μ (mm⁻¹)	5.37
Crystal size (mm)	0.24 × 0.23 × 0.19

Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2002 )
T_min, T_max	0.267, 0.336
No. of measured, independent and observed [I > 2σ(I)] reflections	46553, 9030, 8196
R_int	0.095
(sin θ/λ)_max (Å⁻¹)	0.676

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.040, 0.097, 1.03
No. of reflections	9030
No. of parameters	463
No. of restraints	147
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	1.97, −2.10
Computer programs: APEX2 (Bruker, 2005 ), SAINT and XPREP (Bruker, 2002), SHELXT (Sheldrick, 2015a ), SHELXL2018 (Sheldrick, 2015b ) and SHELXTL (Sheldrick, 2008 ).

Supporting information

CCDC reference: 1839609

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S2056989018006394/zl2726sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989018006394/zl2726Isup2.hkl

checkCIF report

Computing details top

Data collection: APEX2 (Bruker, 2005); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT, SADABS and XPREP (Bruker, 2002); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2018 (Sheldrick, 2015b); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Bis{[5-tert-butyl-1,3-bis(1-pentyl-1H-benzimidazol-2-yl)benzene]selenium} tetrakis(selenocyanato)mercury top

Crystal data top

(C₃₄H₄₁N₄Se)₂[Hg(CNSe)₄]	F(000) = 3528
M_r = 1789.84	D_x = 1.698 Mg m⁻³
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
a = 12.7788 (15) Å	Cell parameters from 9623 reflections
b = 27.276 (3) Å	θ = 2.4–28.8°
c = 20.180 (3) Å	µ = 5.37 mm⁻¹
β = 95.591 (2)°	T = 100 K
V = 7000.4 (15) Å³	Prism, colorless
Z = 4	0.24 × 0.23 × 0.19 mm

Data collection top

Bruker APEXII CCD diffractometer	8196 reflections with I > 2σ(I)
ω scans	R_int = 0.095
Absorption correction: multi-scan (SADABS; Bruker, 2002)	θ_max = 28.7°, θ_min = 3.2°
T_min = 0.267, T_max = 0.336	h = −17→17
46553 measured reflections	k = −36→36
9030 independent reflections	l = −26→27

Refinement top

Refinement on F²	147 restraints
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.040	H-atom parameters constrained
wR(F²) = 0.097	w = 1/[σ²(F_o²) + (0.0353P)² + 29.0826P] where P = (F_o² + 2F_c²)/3
S = 1.03	(Δ/σ)_max = 0.002
9030 reflections	Δρ_max = 1.97 e Å⁻³
463 parameters	Δρ_min = −2.10 e Å⁻³

Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Hg1	0.500000	0.26306 (2)	0.750000	0.02668 (6)
Se1	0.34755 (3)	0.22031 (2)	0.67740 (2)	0.03961 (11)
Se2	0.60087 (4)	0.33443 (2)	0.68639 (3)	0.06039 (16)
C1S	0.3559 (3)	0.15796 (14)	0.7105 (2)	0.0329 (8)
N1S	0.3565 (3)	0.11791 (14)	0.7281 (2)	0.0530 (11)
C2S	0.5511 (4)	0.32426 (16)	0.6025 (3)	0.0527 (14)
N2S	0.5206 (5)	0.3180 (2)	0.5468 (3)	0.0818 (18)
Se3	0.35746 (3)	0.55143 (2)	0.44746 (2)	0.02529 (8)
C1	0.3163 (3)	0.49229 (12)	0.48583 (17)	0.0246 (7)
N1	0.4520 (2)	0.50194 (11)	0.40157 (15)	0.0268 (6)
N2	0.2460 (2)	0.57747 (10)	0.50876 (15)	0.0266 (6)
C2	0.3607 (3)	0.44802 (12)	0.46652 (17)	0.0253 (7)
N3	0.1405 (2)	0.56201 (11)	0.58694 (16)	0.0266 (6)
C3	0.3253 (3)	0.40392 (13)	0.49273 (18)	0.0274 (7)
H3	0.355121	0.373771	0.480319	0.033*
N4	0.5031 (2)	0.42500 (11)	0.39049 (15)	0.0258 (6)
C4	0.2474 (3)	0.40351 (12)	0.53656 (18)	0.0268 (7)
C5	0.2061 (3)	0.44847 (12)	0.55594 (18)	0.0264 (7)
H5	0.153811	0.448618	0.586325	0.032*
C6	0.2404 (3)	0.49287 (12)	0.53141 (17)	0.0244 (7)
C7	0.2071 (3)	0.35552 (12)	0.56442 (19)	0.0289 (7)
C8	0.2489 (4)	0.35045 (15)	0.6371 (2)	0.0415 (10)
H8A	0.220563	0.320554	0.655474	0.062*
H8B	0.227426	0.378964	0.661992	0.062*
H8C	0.325862	0.348547	0.640679	0.062*
C9	0.2425 (5)	0.31052 (15)	0.5271 (3)	0.0593 (15)
H9A	0.319392	0.310115	0.528966	0.089*
H9B	0.212572	0.311945	0.480534	0.089*
H9C	0.218126	0.280689	0.547898	0.089*
C10	0.0862 (4)	0.35594 (18)	0.5592 (4)	0.0672 (18)
H10A	0.060786	0.324118	0.573535	0.101*
H10B	0.058519	0.362129	0.513002	0.101*
H10C	0.062382	0.381828	0.587900	0.101*
C11	0.2057 (3)	0.54262 (12)	0.54487 (18)	0.0253 (7)
C12	0.1378 (3)	0.61244 (13)	0.57613 (19)	0.0276 (7)
C13	0.0821 (3)	0.64909 (14)	0.6057 (2)	0.0352 (8)
H13	0.038815	0.642379	0.640317	0.042*
C14	0.0942 (3)	0.69620 (15)	0.5809 (2)	0.0417 (10)
H14	0.057845	0.722574	0.599213	0.050*
C15	0.1576 (3)	0.70585 (14)	0.5305 (2)	0.0389 (9)
H15	0.162170	0.738592	0.514960	0.047*
C16	0.2146 (3)	0.66971 (13)	0.5018 (2)	0.0325 (8)
H16	0.258323	0.676713	0.467486	0.039*
C17	0.2036 (3)	0.62215 (12)	0.52651 (19)	0.0266 (7)
C18	0.0780 (3)	0.53739 (13)	0.63476 (18)	0.0275 (7)
H18A	0.078020	0.557671	0.675445	0.033*
H18B	0.110525	0.505402	0.647584	0.033*
C19	−0.0355 (3)	0.52925 (14)	0.60471 (18)	0.0317 (8)
H19C	−0.069910	0.561405	0.595627	0.038*
H19D	−0.035131	0.511632	0.561841	0.038*
C20	−0.0988 (3)	0.49959 (14)	0.65154 (19)	0.0336 (8)
H20C	−0.084659	0.512629	0.697324	0.040*
H20D	−0.174743	0.503795	0.637724	0.040*
C21	−0.0724 (3)	0.44565 (15)	0.6518 (2)	0.0376 (9)
H21C	0.003550	0.441622	0.665720	0.045*
H21D	−0.085951	0.432855	0.605869	0.045*
C22	−0.1347 (3)	0.41508 (18)	0.6977 (2)	0.0482 (11)
H22D	−0.125713	0.428832	0.742783	0.072*
H22E	−0.108927	0.381218	0.698705	0.072*
H22F	−0.209348	0.415560	0.681153	0.072*
C11A	0.4382 (3)	0.45556 (13)	0.42009 (17)	0.0257 (7)
C12A	0.5610 (3)	0.45354 (14)	0.35008 (18)	0.0276 (7)
C13A	0.6369 (3)	0.44094 (15)	0.30797 (18)	0.0303 (8)
H13A	0.658408	0.407932	0.302826	0.036*
C14A	0.6792 (3)	0.47904 (16)	0.2740 (2)	0.0360 (9)
H14A	0.731050	0.472026	0.244678	0.043*
C15A	0.6474 (3)	0.52805 (16)	0.2819 (2)	0.0355 (9)
H15A	0.678307	0.553194	0.257699	0.043*
C16A	0.5729 (3)	0.54032 (15)	0.3238 (2)	0.0325 (8)
H16A	0.552318	0.573426	0.329275	0.039*
C17A	0.5288 (3)	0.50248 (13)	0.35761 (18)	0.0278 (7)
C18A	0.5203 (10)	0.3728 (3)	0.3997 (3)	0.0244 (14)	0.852 (8)
H18C	0.510020	0.364134	0.446248	0.029*	0.852 (8)
H18D	0.594009	0.365117	0.392479	0.029*	0.852 (8)
C19A	0.4470 (8)	0.3412 (3)	0.3527 (5)	0.0277 (9)	0.852 (8)
H19A	0.450494	0.352300	0.306284	0.033*	0.852 (8)
H19B	0.373681	0.345283	0.363775	0.033*	0.852 (8)
C20A	0.4781 (4)	0.2871 (3)	0.3588 (4)	0.0309 (12)	0.852 (8)
H20A	0.478389	0.276876	0.405842	0.037*	0.852 (8)
H20B	0.424614	0.267235	0.332065	0.037*	0.852 (8)
C21A	0.5855 (4)	0.27671 (18)	0.3354 (3)	0.0380 (11)	0.852 (8)
H21A	0.640296	0.291481	0.367370	0.046*	0.852 (8)
H21B	0.589821	0.292579	0.291671	0.046*	0.852 (8)
C22A	0.6079 (5)	0.2223 (2)	0.3291 (3)	0.0549 (16)	0.852 (8)
H22A	0.604420	0.206332	0.372400	0.082*	0.852 (8)
H22B	0.678187	0.217741	0.314583	0.082*	0.852 (8)
H22C	0.555409	0.207595	0.296356	0.082*	0.852 (8)
C18B	0.517 (6)	0.3685 (19)	0.411 (3)	0.025 (3)	0.148 (8)
H18E	0.592583	0.359205	0.414384	0.031*	0.148 (8)
H18F	0.490086	0.362428	0.454562	0.031*	0.148 (8)
C19B	0.455 (5)	0.3390 (17)	0.356 (3)	0.028 (3)	0.148 (8)
H19E	0.379655	0.348402	0.354008	0.034*	0.148 (8)
H19F	0.480373	0.347037	0.312626	0.034*	0.148 (8)
C20B	0.4652 (19)	0.2838 (16)	0.368 (2)	0.031 (3)	0.148 (8)
H20E	0.431322	0.275516	0.409056	0.037*	0.148 (8)
H20F	0.426915	0.266244	0.330620	0.037*	0.148 (8)
C21B	0.5777 (19)	0.2659 (10)	0.3768 (12)	0.036 (3)	0.148 (8)
H21E	0.577496	0.230268	0.386154	0.043*	0.148 (8)
H21F	0.614890	0.282350	0.415953	0.043*	0.148 (8)
C22B	0.639 (2)	0.2747 (12)	0.3169 (13)	0.042 (5)	0.148 (8)
H22G	0.700518	0.253336	0.319720	0.064*	0.148 (8)
H22H	0.661217	0.309070	0.316499	0.064*	0.148 (8)
H22I	0.593579	0.267534	0.275995	0.064*	0.148 (8)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Hg1	0.02158 (9)	0.01884 (9)	0.03905 (12)	0.000	−0.00001 (7)	0.000
Se1	0.03104 (19)	0.02352 (18)	0.0598 (3)	−0.00375 (14)	−0.01827 (18)	0.00848 (17)
Se2	0.0556 (3)	0.0361 (2)	0.0907 (4)	−0.0220 (2)	0.0137 (3)	0.0094 (3)
C1S	0.0283 (17)	0.0288 (18)	0.040 (2)	−0.0052 (14)	−0.0040 (15)	0.0027 (16)
N1S	0.061 (3)	0.0317 (19)	0.061 (3)	−0.0115 (17)	−0.018 (2)	0.0078 (18)
C2S	0.053 (3)	0.031 (2)	0.080 (4)	0.0182 (19)	0.033 (3)	0.033 (2)
N2S	0.110 (4)	0.076 (3)	0.066 (3)	0.052 (3)	0.038 (3)	0.045 (3)
Se3	0.02258 (15)	0.02116 (16)	0.03000 (18)	−0.00393 (12)	−0.00818 (13)	0.00354 (13)
C1	0.0241 (15)	0.0218 (15)	0.0252 (16)	−0.0042 (12)	−0.0106 (13)	0.0045 (13)
N1	0.0242 (13)	0.0267 (14)	0.0279 (15)	−0.0031 (11)	−0.0055 (11)	0.0037 (12)
N2	0.0218 (13)	0.0233 (13)	0.0332 (16)	−0.0014 (11)	−0.0054 (11)	0.0018 (12)
C2	0.0263 (16)	0.0235 (16)	0.0239 (16)	−0.0023 (13)	−0.0086 (13)	0.0013 (13)
N3	0.0264 (14)	0.0214 (13)	0.0309 (15)	−0.0033 (11)	−0.0034 (11)	0.0008 (12)
C3	0.0312 (17)	0.0218 (15)	0.0278 (17)	−0.0018 (13)	−0.0048 (14)	−0.0008 (13)
N4	0.0255 (13)	0.0251 (14)	0.0250 (14)	−0.0026 (11)	−0.0060 (11)	−0.0002 (11)
C4	0.0305 (17)	0.0209 (15)	0.0270 (17)	−0.0064 (13)	−0.0068 (13)	0.0006 (13)
C5	0.0267 (16)	0.0242 (16)	0.0265 (17)	−0.0043 (13)	−0.0062 (13)	−0.0007 (13)
C6	0.0232 (15)	0.0226 (15)	0.0250 (16)	−0.0017 (12)	−0.0106 (12)	0.0028 (13)
C7	0.0363 (18)	0.0184 (15)	0.0319 (18)	−0.0026 (13)	0.0025 (14)	−0.0024 (14)
C8	0.062 (3)	0.0283 (19)	0.034 (2)	−0.0092 (18)	0.0025 (19)	0.0041 (16)
C9	0.108 (4)	0.0217 (19)	0.054 (3)	−0.021 (2)	0.037 (3)	−0.0152 (19)
C10	0.036 (2)	0.039 (2)	0.123 (5)	−0.015 (2)	−0.010 (3)	0.028 (3)
C11	0.0218 (15)	0.0236 (15)	0.0282 (17)	−0.0026 (12)	−0.0103 (13)	−0.0001 (13)
C12	0.0273 (16)	0.0226 (16)	0.0309 (18)	−0.0013 (13)	−0.0067 (13)	0.0013 (14)
C13	0.040 (2)	0.0285 (18)	0.038 (2)	−0.0022 (16)	0.0052 (16)	0.0005 (16)
C14	0.045 (2)	0.0262 (18)	0.055 (3)	0.0020 (17)	0.0071 (19)	−0.0025 (18)
C15	0.038 (2)	0.0216 (17)	0.057 (3)	−0.0031 (15)	0.0064 (19)	0.0032 (17)
C16	0.0283 (17)	0.0247 (17)	0.044 (2)	−0.0057 (14)	−0.0006 (15)	0.0043 (16)
C17	0.0242 (15)	0.0202 (15)	0.0336 (18)	−0.0017 (12)	−0.0062 (13)	−0.0014 (13)
C18	0.0272 (16)	0.0271 (17)	0.0264 (17)	−0.0041 (13)	−0.0066 (13)	0.0012 (14)
C19	0.0244 (16)	0.039 (2)	0.0294 (18)	−0.0047 (14)	−0.0076 (14)	0.0019 (16)
C20	0.0272 (17)	0.043 (2)	0.0294 (18)	−0.0078 (15)	−0.0048 (14)	−0.0012 (16)
C21	0.0316 (19)	0.043 (2)	0.037 (2)	−0.0084 (16)	−0.0023 (16)	0.0050 (17)
C22	0.039 (2)	0.054 (3)	0.051 (3)	−0.012 (2)	0.0008 (19)	0.013 (2)
C11A	0.0243 (15)	0.0275 (16)	0.0236 (16)	−0.0007 (13)	−0.0061 (12)	0.0011 (13)
C12A	0.0242 (15)	0.0329 (18)	0.0234 (16)	−0.0031 (13)	−0.0100 (13)	0.0001 (14)
C13A	0.0249 (16)	0.039 (2)	0.0251 (17)	0.0003 (14)	−0.0074 (13)	0.0012 (15)
C14A	0.0230 (16)	0.053 (2)	0.0300 (19)	−0.0047 (16)	−0.0060 (14)	0.0019 (17)
C15A	0.0292 (18)	0.044 (2)	0.0311 (19)	−0.0082 (16)	−0.0074 (15)	0.0083 (17)
C16A	0.0280 (17)	0.0344 (19)	0.0331 (19)	−0.0037 (15)	−0.0071 (14)	0.0056 (16)
C17A	0.0234 (15)	0.0304 (17)	0.0274 (17)	−0.0021 (13)	−0.0084 (13)	0.0027 (14)
C18A	0.026 (2)	0.024 (2)	0.022 (3)	0.0008 (18)	−0.005 (3)	0.004 (2)
C19A	0.026 (2)	0.028 (2)	0.028 (2)	0.0015 (16)	−0.0036 (17)	−0.0035 (18)
C20A	0.034 (2)	0.027 (2)	0.030 (3)	−0.0015 (18)	−0.0016 (18)	−0.0035 (19)
C21A	0.043 (3)	0.037 (2)	0.034 (2)	0.013 (2)	0.002 (2)	−0.001 (2)
C22A	0.069 (4)	0.049 (3)	0.047 (3)	0.024 (3)	0.004 (3)	−0.005 (3)
C18B	0.026 (6)	0.024 (6)	0.026 (6)	0.003 (6)	−0.001 (6)	0.000 (6)
C19B	0.028 (5)	0.028 (5)	0.027 (5)	0.002 (5)	−0.004 (5)	−0.002 (5)
C20B	0.033 (5)	0.030 (5)	0.029 (5)	0.005 (5)	0.000 (5)	−0.004 (5)
C21B	0.039 (5)	0.034 (5)	0.033 (5)	0.005 (5)	−0.002 (5)	−0.004 (5)
C22B	0.042 (10)	0.048 (10)	0.037 (10)	0.011 (9)	0.003 (9)	−0.008 (9)

Geometric parameters (Å, º) top

Hg1—Se1	2.5972 (4)	C18—C19	1.533 (4)
Hg1—Se1ⁱ	2.5972 (4)	C18—H18A	0.9900
Hg1—Se2	2.7242 (5)	C18—H18B	0.9900
Hg1—Se2ⁱ	2.7242 (5)	C19—C20	1.533 (5)
Se1—C1S	1.826 (4)	C19—H19C	0.9900
Se2—C2S	1.771 (7)	C19—H19D	0.9900
C1S—N1S	1.149 (5)	C20—C21	1.509 (5)
C2S—N2S	1.165 (8)	C20—H20C	0.9900
Se3—C1	1.886 (3)	C20—H20D	0.9900
Se3—N1	2.087 (3)	C21—C22	1.527 (5)
Se3—N2	2.099 (3)	C21—H21C	0.9900
C1—C6	1.400 (5)	C21—H21D	0.9900
C1—C2	1.405 (5)	C22—H22D	0.9800
N1—C11A	1.336 (4)	C22—H22E	0.9800
N1—C17A	1.386 (5)	C22—H22F	0.9800
N2—C11	1.332 (5)	C12A—C13A	1.393 (5)
N2—C17	1.395 (4)	C12A—C17A	1.410 (5)
C2—C3	1.406 (5)	C13A—C14A	1.384 (6)
C2—C11A	1.443 (5)	C13A—H13A	0.9500
N3—C11	1.353 (5)	C14A—C15A	1.410 (6)
N3—C12	1.393 (4)	C14A—H14A	0.9500
N3—C18	1.473 (5)	C15A—C16A	1.375 (6)
C3—C4	1.394 (5)	C15A—H15A	0.9500
C3—H3	0.9500	C16A—C17A	1.387 (5)
N4—C11A	1.355 (5)	C16A—H16A	0.9500
N4—C12A	1.392 (5)	C18A—C19A	1.530 (5)
N4—C18A	1.450 (9)	C18A—H18C	0.9900
N4—C18B	1.60 (5)	C18A—H18D	0.9900
C4—C5	1.406 (5)	C19A—C20A	1.530 (5)
C4—C7	1.534 (5)	C19A—H19A	0.9900
C5—C6	1.395 (5)	C19A—H19B	0.9900
C5—H5	0.9500	C20A—C21A	1.520 (6)
C6—C11	1.461 (5)	C20A—H20A	0.9900
C7—C8	1.517 (6)	C20A—H20B	0.9900
C7—C9	1.531 (5)	C21A—C22A	1.520 (6)
C7—C10	1.537 (6)	C21A—H21A	0.9900
C8—H8A	0.9800	C21A—H21B	0.9900
C8—H8B	0.9800	C22A—H22A	0.9800
C8—H8C	0.9800	C22A—H22B	0.9800
C9—H9A	0.9800	C22A—H22C	0.9800
C9—H9B	0.9800	C18B—C19B	1.531 (9)
C9—H9C	0.9800	C18B—H18E	0.9900
C10—H10A	0.9800	C18B—H18F	0.9900
C10—H10B	0.9800	C19B—C20B	1.529 (9)
C10—H10C	0.9800	C19B—H19E	0.9900
C12—C13	1.394 (5)	C19B—H19F	0.9900
C12—C17	1.394 (5)	C20B—C21B	1.512 (10)
C13—C14	1.393 (6)	C20B—H20E	0.9900
C13—H13	0.9500	C20B—H20F	0.9900
C14—C15	1.387 (6)	C21B—C22B	1.519 (10)
C14—H14	0.9500	C21B—H21E	0.9900
C15—C16	1.386 (6)	C21B—H21F	0.9900
C15—H15	0.9500	C22B—H22G	0.9800
C16—C17	1.402 (5)	C22B—H22H	0.9800
C16—H16	0.9500	C22B—H22I	0.9800

Se1—Hg1—Se1ⁱ	126.637 (19)	H19C—C19—H19D	108.0
Se1—Hg1—Se2	114.732 (19)	C21—C20—C19	112.7 (3)
Se1ⁱ—Hg1—Se2	102.907 (18)	C21—C20—H20C	109.1
Se1—Hg1—Se2ⁱ	102.908 (18)	C19—C20—H20C	109.1
Se1ⁱ—Hg1—Se2ⁱ	114.732 (19)	C21—C20—H20D	109.1
Se2—Hg1—Se2ⁱ	88.78 (3)	C19—C20—H20D	109.1
C1S—Se1—Hg1	101.43 (11)	H20C—C20—H20D	107.8
C2S—Se2—Hg1	101.31 (14)	C20—C21—C22	113.9 (4)
N1S—C1S—Se1	175.7 (4)	C20—C21—H21C	108.8
N2S—C2S—Se2	178.3 (5)	C22—C21—H21C	108.8
C1—Se3—N1	79.95 (14)	C20—C21—H21D	108.8
C1—Se3—N2	79.34 (14)	C22—C21—H21D	108.8
N1—Se3—N2	159.29 (11)	H21C—C21—H21D	107.7
C6—C1—C2	121.1 (3)	C21—C22—H22D	109.5
C6—C1—Se3	119.9 (3)	C21—C22—H22E	109.5
C2—C1—Se3	119.0 (3)	H22D—C22—H22E	109.5
C11A—N1—C17A	108.1 (3)	C21—C22—H22F	109.5
C11A—N1—Se3	113.0 (2)	H22D—C22—H22F	109.5
C17A—N1—Se3	138.9 (2)	H22E—C22—H22F	109.5
C11—N2—C17	107.6 (3)	N1—C11A—N4	110.9 (3)
C11—N2—Se3	113.7 (2)	N1—C11A—C2	115.8 (3)
C17—N2—Se3	138.6 (2)	N4—C11A—C2	133.4 (3)
C1—C2—C3	118.5 (3)	N4—C12A—C13A	131.4 (4)
C1—C2—C11A	112.3 (3)	N4—C12A—C17A	106.8 (3)
C3—C2—C11A	129.2 (3)	C13A—C12A—C17A	121.8 (4)
C11—N3—C12	107.2 (3)	C14A—C13A—C12A	116.5 (4)
C11—N3—C18	129.7 (3)	C14A—C13A—H13A	121.8
C12—N3—C18	123.1 (3)	C12A—C13A—H13A	121.8
C4—C3—C2	121.4 (3)	C13A—C14A—C15A	121.7 (4)
C4—C3—H3	119.3	C13A—C14A—H14A	119.2
C2—C3—H3	119.3	C15A—C14A—H14A	119.2
C11A—N4—C12A	107.3 (3)	C16A—C15A—C14A	121.6 (4)
C11A—N4—C18A	129.7 (5)	C16A—C15A—H15A	119.2
C12A—N4—C18A	122.8 (5)	C14A—C15A—H15A	119.2
C11A—N4—C18B	122 (3)	C15A—C16A—C17A	117.4 (4)
C12A—N4—C18B	129 (3)	C15A—C16A—H16A	121.3
C3—C4—C5	118.7 (3)	C17A—C16A—H16A	121.3
C3—C4—C7	121.7 (3)	N1—C17A—C16A	132.1 (4)
C5—C4—C7	119.6 (3)	N1—C17A—C12A	107.0 (3)
C6—C5—C4	121.3 (4)	C16A—C17A—C12A	121.0 (4)
C6—C5—H5	119.4	N4—C18A—C19A	113.4 (6)
C4—C5—H5	119.4	N4—C18A—H18C	108.9
C5—C6—C1	119.0 (3)	C19A—C18A—H18C	108.9
C5—C6—C11	129.0 (3)	N4—C18A—H18D	108.9
C1—C6—C11	112.0 (3)	C19A—C18A—H18D	108.9
C8—C7—C9	108.0 (4)	H18C—C18A—H18D	107.7
C8—C7—C4	109.4 (3)	C18A—C19A—C20A	110.8 (4)
C9—C7—C4	112.2 (3)	C18A—C19A—H19A	109.5
C8—C7—C10	108.9 (4)	C20A—C19A—H19A	109.5
C9—C7—C10	108.4 (4)	C18A—C19A—H19B	109.5
C4—C7—C10	109.9 (3)	C20A—C19A—H19B	109.5
C7—C8—H8A	109.5	H19A—C19A—H19B	108.1
C7—C8—H8B	109.5	C21A—C20A—C19A	113.0 (5)
H8A—C8—H8B	109.5	C21A—C20A—H20A	109.0
C7—C8—H8C	109.5	C19A—C20A—H20A	109.0
H8A—C8—H8C	109.5	C21A—C20A—H20B	109.0
H8B—C8—H8C	109.5	C19A—C20A—H20B	109.0
C7—C9—H9A	109.5	H20A—C20A—H20B	107.8
C7—C9—H9B	109.5	C20A—C21A—C22A	113.0 (5)
H9A—C9—H9B	109.5	C20A—C21A—H21A	109.0
C7—C9—H9C	109.5	C22A—C21A—H21A	109.0
H9A—C9—H9C	109.5	C20A—C21A—H21B	109.0
H9B—C9—H9C	109.5	C22A—C21A—H21B	109.0
C7—C10—H10A	109.5	H21A—C21A—H21B	107.8
C7—C10—H10B	109.5	C21A—C22A—H22A	109.5
H10A—C10—H10B	109.5	C21A—C22A—H22B	109.5
C7—C10—H10C	109.5	H22A—C22A—H22B	109.5
H10A—C10—H10C	109.5	C21A—C22A—H22C	109.5
H10B—C10—H10C	109.5	H22A—C22A—H22C	109.5
N2—C11—N3	111.0 (3)	H22B—C22A—H22C	109.5
N2—C11—C6	114.9 (3)	C19B—C18B—N4	106 (3)
N3—C11—C6	134.1 (3)	C19B—C18B—H18E	110.5
N3—C12—C13	130.3 (4)	N4—C18B—H18E	110.5
N3—C12—C17	107.0 (3)	C19B—C18B—H18F	110.5
C13—C12—C17	122.7 (3)	N4—C18B—H18F	110.5
C14—C13—C12	115.4 (4)	H18E—C18B—H18F	108.7
C14—C13—H13	122.3	C20B—C19B—C18B	111.6 (13)
C12—C13—H13	122.3	C20B—C19B—H19E	109.3
C15—C14—C13	122.1 (4)	C18B—C19B—H19E	109.3
C15—C14—H14	118.9	C20B—C19B—H19F	109.3
C13—C14—H14	118.9	C18B—C19B—H19F	109.3
C16—C15—C14	122.7 (4)	H19E—C19B—H19F	108.0
C16—C15—H15	118.6	C21B—C20B—C19B	113.8 (13)
C14—C15—H15	118.6	C21B—C20B—H20E	108.8
C15—C16—C17	115.7 (4)	C19B—C20B—H20E	108.8
C15—C16—H16	122.1	C21B—C20B—H20F	108.8
C17—C16—H16	122.1	C19B—C20B—H20F	108.8
C12—C17—N2	107.2 (3)	H20E—C20B—H20F	107.7
C12—C17—C16	121.3 (3)	C20B—C21B—C22B	114.6 (13)
N2—C17—C16	131.5 (4)	C20B—C21B—H21E	108.6
N3—C18—C19	111.1 (3)	C22B—C21B—H21E	108.6
N3—C18—H18A	109.4	C20B—C21B—H21F	108.6
C19—C18—H18A	109.4	C22B—C21B—H21F	108.6
N3—C18—H18B	109.4	H21E—C21B—H21F	107.6
C19—C18—H18B	109.4	C21B—C22B—H22G	109.5
H18A—C18—H18B	108.0	C21B—C22B—H22H	109.5
C20—C19—C18	111.6 (3)	H22G—C22B—H22H	109.5
C20—C19—H19C	109.3	C21B—C22B—H22I	109.5
C18—C19—H19C	109.3	H22G—C22B—H22I	109.5
C20—C19—H19D	109.3	H22H—C22B—H22I	109.5
C18—C19—H19D	109.3

N1—Se3—C1—C6	−179.9 (3)	Se3—N2—C17—C16	8.2 (6)
N2—Se3—C1—C6	0.1 (2)	C15—C16—C17—C12	1.0 (5)
N1—Se3—C1—C2	−1.6 (2)	C15—C16—C17—N2	178.2 (4)
N2—Se3—C1—C2	178.3 (3)	C11—N3—C18—C19	−96.6 (4)
C6—C1—C2—C3	1.5 (5)	C12—N3—C18—C19	80.9 (4)
Se3—C1—C2—C3	−176.6 (2)	N3—C18—C19—C20	174.9 (3)
C6—C1—C2—C11A	−179.1 (3)	C18—C19—C20—C21	−76.2 (4)
Se3—C1—C2—C11A	2.7 (4)	C19—C20—C21—C22	−179.7 (3)
C1—C2—C3—C4	0.5 (5)	C17A—N1—C11A—N4	0.3 (4)
C11A—C2—C3—C4	−178.7 (3)	Se3—N1—C11A—N4	−178.3 (2)
C2—C3—C4—C5	−1.7 (5)	C17A—N1—C11A—C2	179.7 (3)
C2—C3—C4—C7	178.9 (3)	Se3—N1—C11A—C2	1.1 (4)
C3—C4—C5—C6	1.0 (5)	C12A—N4—C11A—N1	−0.7 (4)
C7—C4—C5—C6	−179.6 (3)	C18A—N4—C11A—N1	175.0 (5)
C4—C5—C6—C1	1.0 (5)	C18B—N4—C11A—N1	171 (3)
C4—C5—C6—C11	178.9 (3)	C12A—N4—C11A—C2	−179.9 (3)
C2—C1—C6—C5	−2.3 (5)	C18A—N4—C11A—C2	−4.3 (7)
Se3—C1—C6—C5	175.9 (2)	C18B—N4—C11A—C2	−9 (3)
C2—C1—C6—C11	179.5 (3)	C1—C2—C11A—N1	−2.3 (4)
Se3—C1—C6—C11	−2.3 (4)	C3—C2—C11A—N1	176.9 (3)
C3—C4—C7—C8	106.9 (4)	C1—C2—C11A—N4	176.9 (3)
C5—C4—C7—C8	−72.5 (4)	C3—C2—C11A—N4	−3.9 (6)
C3—C4—C7—C9	−13.0 (5)	C11A—N4—C12A—C13A	−178.7 (3)
C5—C4—C7—C9	167.7 (4)	C18A—N4—C12A—C13A	5.3 (6)
C3—C4—C7—C10	−133.6 (4)	C18B—N4—C12A—C13A	11 (3)
C5—C4—C7—C10	47.0 (5)	C11A—N4—C12A—C17A	0.8 (3)
C17—N2—C11—N3	−1.5 (4)	C18A—N4—C12A—C17A	−175.3 (5)
Se3—N2—C11—N3	175.4 (2)	C18B—N4—C12A—C17A	−170 (3)
C17—N2—C11—C6	178.7 (3)	N4—C12A—C13A—C14A	179.5 (3)
Se3—N2—C11—C6	−4.4 (3)	C17A—C12A—C13A—C14A	0.2 (5)
C12—N3—C11—N2	1.0 (4)	C12A—C13A—C14A—C15A	0.2 (5)
C18—N3—C11—N2	178.8 (3)	C13A—C14A—C15A—C16A	0.1 (5)
C12—N3—C11—C6	−179.3 (3)	C14A—C15A—C16A—C17A	−0.7 (5)
C18—N3—C11—C6	−1.5 (6)	C11A—N1—C17A—C16A	180.0 (4)
C5—C6—C11—N2	−173.6 (3)	Se3—N1—C17A—C16A	−2.0 (6)
C1—C6—C11—N2	4.4 (4)	C11A—N1—C17A—C12A	0.2 (4)
C5—C6—C11—N3	6.7 (6)	Se3—N1—C17A—C12A	178.2 (2)
C1—C6—C11—N3	−175.3 (3)	C15A—C16A—C17A—N1	−178.6 (3)
C11—N3—C12—C13	179.1 (4)	C15A—C16A—C17A—C12A	1.2 (5)
C18—N3—C12—C13	1.1 (6)	N4—C12A—C17A—N1	−0.6 (3)
C11—N3—C12—C17	−0.2 (4)	C13A—C12A—C17A—N1	178.9 (3)
C18—N3—C12—C17	−178.1 (3)	N4—C12A—C17A—C16A	179.6 (3)
N3—C12—C13—C14	−177.4 (4)	C13A—C12A—C17A—C16A	−0.9 (5)
C17—C12—C13—C14	1.7 (6)	C11A—N4—C18A—C19A	90.1 (8)
C12—C13—C14—C15	−0.2 (6)	C12A—N4—C18A—C19A	−94.9 (10)
C13—C14—C15—C16	−1.0 (7)	N4—C18A—C19A—C20A	172.9 (7)
C14—C15—C16—C17	0.6 (6)	C18A—C19A—C20A—C21A	−65.4 (11)
N3—C12—C17—N2	−0.7 (4)	C19A—C20A—C21A—C22A	−169.3 (5)
C13—C12—C17—N2	179.9 (3)	C11A—N4—C18B—C19B	104 (4)
N3—C12—C17—C16	177.1 (3)	C12A—N4—C18B—C19B	−87 (6)
C13—C12—C17—C16	−2.2 (5)	N4—C18B—C19B—C20B	178 (4)
C11—N2—C17—C12	1.3 (4)	C18B—C19B—C20B—C21B	−55 (7)
Se3—N2—C17—C12	−174.3 (2)	C19B—C20B—C21B—C22B	−60 (4)
C11—N2—C17—C16	−176.1 (4)

Symmetry code: (i) −x+1, y, −z+3/2.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C18—H18A···N1Sⁱⁱ	0.99	2.62	3.568 (5)	160
C18A—H18C···N2S	0.99	2.38	3.324 (8)	159
C18B—H18F···N2S	0.99	2.22	3.06 (6)	142

Symmetry code: (ii) −x+1/2, y+1/2, −z+3/2.

Funding information

RJB is grateful for NSF award 1205608, to the Partnership for Reduced Dimensional Materials for partial funding of this research, to Howard University's Nanoscience Facility for access to liquid nitrogen, and the NSF–MRI program (grant No. CHE0619278) for funds to purchase the X-ray diffractometer. HBS is grateful to the DST, New Delhi, for a J. C. Bose National Fellowship. VR gratefully acknowledges the Council of Scientific and Industrial Research (CSIR), New Delhi, for a Senior Research Fellowship.

References

Back, T. G. (1999). Organoselenium Chemistry: A Practical Approach. Oxford University Press. Google Scholar
Bhuyan, B. J. & Mugesh, G. (2012). Biological and Biochemical Aspects of Selenium Compounds. In Organoselenium Chemistry: Synthesis and Reactions edited by T. Wirth, p. 361. Weinheim: Wiley-VCH. Google Scholar
Bondi, A. (1964). J. Phys. Chem. 68, 441–451. CrossRef CAS Web of Science Google Scholar
Brodersen, K., Cygan, M. & Hummel, H.-U. (1984). Z. Naturforschung, Teil B, 39, 582-5. Google Scholar
Bruker (2002). SMART, SAINT and SADABS. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Bruker (2005). APEX2. Bruker AXS Inc., Madison, Wisconsin, USA. Google Scholar
Chan, M. H.-Y., Wong, H.-L. & Yam, V. W.-W. (2016). Inorg. Chem. 55, 5570–5577. CrossRef Google Scholar
Chivers, T. & Laitinen, R. S. (2015). Chem. Soc. Rev. 44, 1725–1739. CrossRef CAS Google Scholar
Dorazco-González, A. (2014). Organometallics, 33, 868–875. Google Scholar
Fujihara, H., Mima, H. & Furukawa, N. (1995). J. Am. Chem. Soc. 117, 10153–10154. CSD CrossRef CAS Web of Science Google Scholar
Fujihara, H., Mima, H. & Furukawa, H. (1995). J. Am. Chem. Soc. 117, 10153–10154. CrossRef Google Scholar
Kremer, A., Aurisicchio, C., De Leo, F., Ventura, B., Wouters, J., Armaroli, N., Barbieri, A. & Bonifazi, D. (2015). Chem. Eur. J. 21, 15377–15387. CSD CrossRef CAS Google Scholar
Kushch, N. D., Buravov, L. I., Pesotskii, S. I., Lyubovskii, R. B., Yagubskii, E. B., Kaplunov, M. G., Golubev, E. V., Narymbetov, B. Zh., Khasanov, S. S., Zorina, L. V., Rozenberg, L. P., Shibaeva, R. P., Kobayashi, A. & Kobayashi, H. (1998). J. Mater. Chem. 8, 897–901. CrossRef Google Scholar
Li, S.-L., Fun, H.-K., Chantrapromma, S., Wu, J.-Y. & Tian, Y.-P. (2006a). Acta Cryst. E62, i47–i49. CrossRef IUCr Journals Google Scholar
Li, S.-L., Wu, J.-Y., Tian, Y.-P., Ming, H., Wang, P., Jiang, M.-H. & Fun, H.-K. (2006b). Eur. J. Inorg. Chem. pp. 2900–2907. CrossRef Google Scholar
Manjare, S. T., Kim, Y. & Churchill, D. G. (2014). Acc. Chem. Res. 47, 2985–2998. CrossRef CAS Google Scholar
Mugesh, G. & Singh, H. B. (2000). Chem. Soc. Rev. 29, 347–357. Web of Science CrossRef CAS Google Scholar
Poleschner, H. & Seppelt, K. (2004). Chem. Eur. J. 10, 6565–6574. CrossRef PubMed CAS Google Scholar
Pop, A., Silvestru, A., Juárez-Pérez, E. J., Arca, M., Lippolis, V. & Silvestru, C. (2014). Dalton Trans. 43, 2221–2233. CrossRef Google Scholar
Prasad, P. R., Selvakumar, K., Singh, H. B. & Butcher, R. J. (2016). J. Org. Chem. 81, 3214–3226. CrossRef Google Scholar
Rani, V., Singh, H. B. & Butcher, R. J. (2017a). Acta Cryst. E73, 341–344. CSD CrossRef IUCr Journals Google Scholar
Rani, V., Singh, H. B. & Butcher, R. J. (2017b). IUCrData, 2, x171746. Google Scholar
Rani, V., Singh, H. B. & Butcher, R. J. (2017c). Organometallics, 36, 4741–4752. CrossRef Google Scholar
Rani, V., Singh, H. B. & Butcher, R. J. (2018a). Acta Cryst. E74, 390–393. CrossRef IUCr Journals Google Scholar
Rani, V., Singh, H. B. & Butcher, R. J. (2018b). J. Organomet. Chem. 859, 33–43. CrossRef Google Scholar
Selvakumar, K., Shah, P., Singh, H. B. & Butcher, R. J. (2011a). Chem. Eur. J. 17, 12741–12755. CrossRef Google Scholar
Selvakumar, K., Singh, H. B. & Butcher, R. J. (2011b). Tetrahedron Lett. 52, 6831–6834. CrossRef Google Scholar
Selvakumar, K., Singh, H. B., Goel, N. & Singh, U. P. (2011c). Organometallics, 30, 3892–3896. CrossRef Google Scholar
Selvakumar, K., Singh, V. P., Shah, P. & Singh, H. B. (2011d). Main Group Chemistry, 10, 141–152. Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sheldrick, G. M. (2015a). Acta Cryst. A71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Sheldrick, G. M. (2015b). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Shibaeva, R. P., Khasanov, S. S., Rozenberg, L. P., Kushch, N. D., Yagubskii, E. B. & Canadell, E. (1997). Kristallografiya, 42, 846–850. Google Scholar
Shibaeva, R. P., Rozenberg, L. P., Kushch, N. D. & Yagubskii, E. B. (1994). Kristallografiya, 39, 825–831. Google Scholar
Singh, V. P., Singh, H. B. & Butcher, R. J. (2011). Chem. Commun. 47, 7221–7223. Web of Science CSD CrossRef CAS Google Scholar
Singh, F. V. & Wirth, T. (2012). Selenium Compounds as Ligands and Catalysts. In Organoselenium Chemistry: Synthesis and Reactions edited by T. Wirth, pp. 321–334. Weinheim: Wiley-VCH. Google Scholar
Space, G. & Armeanu, V. (1930). Bul. Soc. Stiinte Cluj, 5, 294–318. Google Scholar
Sun, H.-Q., Wang, X.-Q. & Zhang, W.-W. (2013). Acta Cryst. E69, i59. CrossRef IUCr Journals Google Scholar
Sun, H.-Q., Yu, W.-T., Yuan, D.-R., Wang, X.-Q. & Xue, G. (2005). Acta Cryst. E61, i111–i112. Web of Science CrossRef CAS IUCr Journals Google Scholar
Wang, Z., Sun, Z., Hao, X.-Q., Niu, J.-L., Wei, D., Tu, T., Gong, J.-F. & Song, M.-P. (2014). Organometallics, 33, 1563–1573. CrossRef Google Scholar
Zade, S. S., Panda, S., Tripathi, S. K., Singh, H. B. & Wolmershäuser, G. (2004a). Eur. J. Org. Chem. pp. 3857–3864. CrossRef Google Scholar
Zade, S. S., Singh, H. B. & Butcher, R. J. (2004b). Angew. Chem. Int. Ed. 43, 4513–4515. CrossRef Google Scholar
Zhao, L., Li, J., Li, Y., Liu, J., Wirth, T. & Li, Z. (2012). Bioorg. Med. Chem. 20, 2558–2563. Web of Science CrossRef CAS PubMed Google Scholar

This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.