Crystal structure of (2,2′-bi­pyridine-κ2N,N′)bis­(3,5-di-tert-butyl-o-benzo­quinonato-κ2O,O′)ruthenium(II)

Faizi, M.S.H.; Ali, A.; Potaskalov, V.A.

doi:10.1107/S205698901700281X

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Volume 73| Part 3| March 2017| Pages 459-462

https://doi.org/10.1107/S205698901700281X

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Crystal structure of (2,2′-bipyridine-κ²N,N′)bis(3,5-di-tert-butyl-o-benzoquinonato-κ²O,O′)ruthenium(II)

Md. Serajul Haque Faizi,^a Akram Ali ^b and Vadim A. Potaskalov ^c ^*

^aDepartment of Chemistry, College of Science, Sultan Qaboos University, PO Box 36, Al-Khod 123, Muscat, Sultanate of Oman, ^bDepartment of Chemistry, Indian Institute of Technology, Kanpur 208 016 UP, India, and ^cDepartment of General and Inorganic Chemistry, National Technical University of Ukraine, Kyiv Polytechnic Institute, 37 Prospect Peremogy, 03056 Kiev, Ukraine
^*Correspondence e-mail: potaskalov@xtf.kpi.ua

Edited by H. Ishida, Okayama University, Japan (Received 5 December 2016; accepted 20 February 2017; online 28 February 2017)

In the title mononuclear complex, [Ru(C₁₄H₂₀O₂)₂(C₁₀H₈N₂)], the Ru^II ion has a distorted octahedral coordination environment defined by two N atoms of the chelating 2,2′-bipyridine ligand and four O atoms from two 3,5-di-tert-butyl-o-benzoquinone ligands. In the crystal, the complex molecules are linked by intermolecular C—H⋯O hydrogen bonds and π–π stacking interactions between the 2,2′-bipyridine ligands [centroid–centroid distance = 3.538 (3) Å], resulting in a layer structure extending parallel to the ab plane.

Keywords: crystal structure; Ru(II) complex; π–π stacking; 3,5-di-tert-butyl-o-benzoquinone; 2,2′-bipyridine.

CCDC reference: 1533648

1. Chemical context

The coordination chemistry of o-quinone ligands has been a subject of interest since the beginning of the century, but only within the past decade have detailed studies on the composition and properties of o-quinone complexes been carried out. It has been reported that o-quinone derivatives are non-innocent electroactive ligands that can be found as neutral quinones, radical semiquinones or dianionic catecholates (Lever et al., 1988 ). The coordination chemistry of ruthenium complexes has been studied over the past few decades because of their versatile and diverse applications in molecular catalysis (Pagliaro et al., 2005 ; Ramakrishna & Bhat, 2011 ) and bioinorganic chemistry (van Rijt & Sadler, 2009 ). Ruthenium complexes with two o-quinone derivatives and one 2,2′-bipyridine (bpy) ligand, namely [Ru(bpy)(C₆H₄O₂)₂] and [Ru(bpy)(C₁₄H₂₀O₂)₂] (title compound), have been investigated by using various experimental techniques (Lever et al., 1988). Although the ruthenium metals in these complexes potentially could be in the (II), (III) or (IV) oxidation state, according to the oxidation states of the two o-quinone ligands, the state of the metals was confirmed to be bivalent by photoelectron spectroscopy. In order to obtain ruthenium(III) species, it was necessary to oxidize the complexes by silver perchlorate in non-aqueous media. Lever et al. (1988) concluded that the complexes are best regarded as Ru^II(bpy)(sq)₂ (sq: semiquinone anion-radical) with significant mixing of metal and ligand orbitals through Ru–sq π back-donation, which results in elongation of the C—O bonds of o-quinone ligands. This elongation has been demonstrated for [Ru(bpy)(C₆H₄O₂)₂] by X-ray single crystal analysis, but the structure of the title compound has not previously been characterized.

2. Structural commentary

In the title compound, the Ru^II ion has a distorted octahedral RuN₂O₄ coordination environment defined by two 3,5-di-tert-butyl-o-benzosemiquinone anion-radicals and one 2,2′-bipyridine ligand (Fig. 1). The coordination environment is identified by Ru—O and Ru—N bonds (Table 1). The C—N and C—C bond lengths in the 2,2′-bipyridine ligand are normal for 2-substituted pyridine derivatives (Krämer & Fritsky, 2000 ; Strotmeyer et al., 2003 ; Moroz et al., 2012 ). The benzosemiquinone ligands exhibit almost equivalent C—O distances (Table 1). These bond lengths are intermediate between values expected for the semiquinone (1.29 Å) and catecholate (1.34 Å) forms (Buchanan et al., 1978 ). The Ru—O, Ru—N, C—O and C—C bond lengths in the title complex are very close to those observed in [Ru(bpy)(C₆H₄O₂)₂] (Lever et al., 1988).

Table 1
Selected bond lengths (Å)

Ru1—O2	1.978 (3)	Ru1—N1	2.053 (4)
Ru1—O4	1.988 (3)	O1—C14	1.340 (6)
Ru1—O1	1.990 (3)	O2—C15	1.325 (5)
Ru1—O3	1.994 (3)	O3—C28	1.340 (5)
Ru1—N2	2.044 (4)	O4—C1	1.332 (6)

Figure 1
The molecular structure of the title compound with the atom-labelling scheme. Displacement ellipsoids are drawn at the 40% probability level.

3. Supramolecular features

In the crystal, the complex molecules are linked via C—H⋯O hydrogen bonds (Table 2) and π–π stacking interactions between inversion-related 2,2′-bipyridine ligands [centroid–centroid distance = 3.538 (3) Å], which results in a layer structure parallel to the ab plane (Figs. 2 and 3).

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C30—H30⋯O3ⁱ	0.93	2.54	3.427 (6)	159
C32—H32⋯O4ⁱⁱ	0.93	2.49	3.322 (6)	148
C35—H35⋯O4ⁱⁱ	0.93	2.39	3.232 (6)	151
Symmetry codes: (i) -x+1, -y, -z+2; (ii) -x, -y, -z+2.

Figure 2
A packing view of the title compound with the C—H⋯O and π–π interactions shown as dashed lines.

Figure 3
A packing diagram of the title compound viewed along the b axis.

4. Database survey

A search of the Cambridge Structural Database (CSD, Version 5.37, update May 2016; Groom et al., 2016 ) gave 14 hits for mononuclear ruthenium complexes with 3,5-di-tert-butyl-o-benzoquinone ligands in three possible catecholate, semiquinone and quinone forms (CSD refcodes: EHUMEZ, EHUMID, EHUMOJ, FAGKON, FAGKON10, FIHQOC, FIRVIL, JECHII, JECHOO, MAFHOR, SAHHUF, SOCCAO, VINZIB, WUPGUJ).

5. Synthesis and crystallization

3,5-Di-tert-butyl-o-benzoquinone (0.2 g, 0.90 mmol) was added to 20 ml dry methanol and then triethylamine (0.181 g, 1.8 mmol) was added dropwise and the resultant mixture was stirred for 5 min. Ru(bpy)₂Cl₂ (0.288 g, 0.45 mmol) was then added to the solution and the contents were refluxed for 6 h. After refluxing, the reaction mixture was cooled down to room temperature and the contents were filtered off. The obtained residue was washed with cold methanol and dried in vacuo (yield: 0.160 g, 70%). Slow evaporation of a solution of the compound in a CH₂Cl₂–MeOH mixture (1:1, v/v) yielded single crystals suitable for X-ray diffraction. Crystals of title compound gave no EPR signal at room and liquid nitrogen temperatures, and thus are diamagnetic.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 3. H atoms of the methyl groups were located in a difference Fourier map and refined as part of rigid rotating groups, with C—H = 0.96 Å and U_iso(H) = 1.5U_eq(C). The remaining (aromatic) H atoms were placed geometrically and refined using a riding model, with C—H = 0.93 Å and U_iso(H) = 1.2U_eq(C).

Table 3
Experimental details

Crystal data
Chemical formula	[Ru(C₁₄H₂₀O₂)₂(C₁₀H₈N₂)]
M_r	697.85
Crystal system, space group	Triclinic, P $[\overline{1}]$
Temperature (K)	100
a, b, c (Å)	10.125 (5), 10.325 (5), 17.419 (5)
α, β, γ (°)	76.583 (5), 83.238 (5), 85.777 (5)
V (Å³)	1756.9 (13)
Z	2
Radiation type	Mo Kα
μ (mm⁻¹)	0.49
Crystal size (mm)	0.21 × 0.17 × 0.13

Data collection
Diffractometer	Bruker SMART APEX CCD diffractometer
Absorption correction	Multi-scan (SADABS; Sheldrick, 2004 )
T_min, T_max	0.902, 0.925
No. of measured, independent and observed [I > 2σ(I)] reflections	8836, 6058, 4508
R_int	0.033
(sin θ/λ)_max (Å⁻¹)	0.596

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.051, 0.142, 1.02
No. of reflections	6058
No. of parameters	418
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.95, −0.48
Computer programs: SMART and SAINT (Bruker, 2003 ), SIR97 (Altomare et al., 1999 ), SHELXL2014/6 (Sheldrick, 2015 ) and DIAMOND (Brandenberg & Putz, 2006 ).

Supporting information

CCDC reference: 1533648

Crystal structure: contains datablock I. DOI: https://doi.org/10.1107/S205698901700281X/is5467sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S205698901700281X/is5467Isup2.hkl

checkCIF report

Computing details top

Data collection: SMART (Bruker, 2003); cell refinement: SAINT (Bruker, 2003); data reduction: SAINT (Bruker, 2003); program(s) used to solve structure: SIR97 (Altomare et al., 1999); program(s) used to refine structure: SHELXL2014/6 (Sheldrick, 2015); molecular graphics: DIAMOND (Brandenberg & Putz, 2006); software used to prepare material for publication: DIAMOND (Brandenberg & Putz, 2006).

(2,2'-Bipyridine-κ²N,N')bis(3,5-di-tert-butyl-o-benzoquinonato-κ²O,O')ruthenium(II) top

Crystal data top

[Ru(C₁₄H₂₀O₂)₂(C₁₀H₈N₂)]	Z = 2
M_r = 697.85	F(000) = 732
Triclinic, P1	D_x = 1.319 Mg m⁻³
a = 10.125 (5) Å	Mo Kα radiation, λ = 0.71073 Å
b = 10.325 (5) Å	Cell parameters from 1535 reflections
c = 17.419 (5) Å	θ = 2.0–25.0°
α = 76.583 (5)°	µ = 0.49 mm⁻¹
β = 83.238 (5)°	T = 100 K
γ = 85.777 (5)°	Block, red
V = 1756.9 (13) Å³	0.21 × 0.17 × 0.13 mm

Data collection top

Bruker SMART APEX CCD diffractometer	6058 independent reflections
Radiation source: fine-focus sealed tube	4508 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.033
/w–scans	θ_max = 25.1°, θ_min = 2.0°
Absorption correction: multi-scan (SADABS; Sheldrick, 2004)	h = −12→9
T_min = 0.902, T_max = 0.925	k = −12→12
8836 measured reflections	l = −20→20

Refinement top

Refinement on F²	0 restraints
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.051	H-atom parameters constrained
wR(F²) = 0.142	w = 1/[σ²(F_o²) + (0.0802P)²] where P = (F_o² + 2F_c²)/3
S = 1.02	(Δ/σ)_max = 0.001
6058 reflections	Δρ_max = 0.95 e Å⁻³
418 parameters	Δρ_min = −0.48 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
Ru1	0.23460 (4)	0.24040 (4)	0.88962 (2)	0.02318 (15)
O1	0.3873 (3)	0.2156 (3)	0.81046 (19)	0.0282 (8)
O2	0.2021 (3)	0.4171 (3)	0.81903 (18)	0.0248 (7)
O3	0.3497 (3)	0.3434 (3)	0.93673 (17)	0.0230 (7)
O4	0.1382 (3)	0.1589 (3)	0.82104 (18)	0.0265 (7)
N1	0.2578 (4)	0.0644 (4)	0.9718 (2)	0.0218 (8)
N2	0.0725 (3)	0.2515 (4)	0.9701 (2)	0.0195 (8)
C1	0.2025 (5)	0.1849 (5)	0.7483 (3)	0.0302 (12)
C2	0.1427 (6)	0.1768 (5)	0.6815 (3)	0.0345 (12)
H2	0.0544	0.1539	0.6868	0.041*
C3	0.2142 (6)	0.2025 (5)	0.6076 (3)	0.0405 (14)
C4	0.1509 (6)	0.2096 (6)	0.5313 (3)	0.0476 (15)
C5	0.1523 (8)	0.3538 (7)	0.4812 (4)	0.071 (2)
H5A	0.1063	0.4127	0.5119	0.107*
H5B	0.1087	0.3594	0.4344	0.107*
H5C	0.2427	0.3792	0.4662	0.107*
C6	0.2347 (7)	0.1222 (6)	0.4809 (3)	0.0571 (18)
H6A	0.3219	0.1562	0.4657	0.086*
H6B	0.1922	0.1238	0.4343	0.086*
H6C	0.2419	0.0322	0.5115	0.086*
C7	0.0131 (8)	0.1589 (9)	0.5479 (4)	0.085 (3)
H7A	0.0148	0.0718	0.5826	0.127*
H7B	−0.0190	0.1540	0.4990	0.127*
H7C	−0.0449	0.2184	0.5728	0.127*
C8	0.3507 (6)	0.2296 (6)	0.6035 (3)	0.0430 (14)
H8	0.3991	0.2444	0.5537	0.052*
C9	0.4180 (6)	0.2358 (5)	0.6674 (3)	0.0369 (13)
C10	0.5641 (6)	0.2666 (6)	0.6581 (3)	0.0422 (14)
C11	0.6255 (6)	0.2910 (7)	0.5711 (3)	0.0560 (17)
H11A	0.7175	0.3104	0.5681	0.084*
H11B	0.5785	0.3651	0.5399	0.084*
H11C	0.6187	0.2128	0.5511	0.084*
C12	0.6420 (6)	0.1452 (6)	0.7054 (4)	0.0503 (16)
H12A	0.6319	0.0681	0.6850	0.075*
H12B	0.6078	0.1287	0.7604	0.075*
H12C	0.7347	0.1636	0.7001	0.075*
C13	0.5878 (6)	0.3889 (6)	0.6898 (3)	0.0480 (15)
H13A	0.6813	0.4040	0.6829	0.072*
H13B	0.5562	0.3735	0.7452	0.072*
H13C	0.5407	0.4657	0.6612	0.072*
C14	0.3400 (5)	0.2136 (5)	0.7421 (3)	0.0330 (12)
C15	0.3032 (5)	0.4926 (5)	0.8173 (3)	0.0268 (11)
C16	0.3288 (5)	0.6132 (5)	0.7597 (3)	0.0265 (11)
C17	0.2379 (5)	0.6627 (5)	0.6931 (3)	0.0332 (12)
C18	0.2382 (6)	0.5619 (6)	0.6419 (3)	0.0406 (14)
H18A	0.3282	0.5418	0.6222	0.061*
H18B	0.1872	0.5984	0.5981	0.061*
H18C	0.1996	0.4817	0.6731	0.061*
C19	0.0951 (5)	0.6859 (6)	0.7286 (3)	0.0415 (14)
H19A	0.0667	0.6064	0.7659	0.062*
H19B	0.0374	0.7078	0.6869	0.062*
H19C	0.0913	0.7580	0.7551	0.062*
C20	0.2839 (6)	0.7960 (6)	0.6391 (3)	0.0480 (16)
H20A	0.2800	0.8624	0.6700	0.072*
H20B	0.2265	0.8244	0.5976	0.072*
H20C	0.3737	0.7842	0.6162	0.072*
C21	0.4410 (5)	0.6772 (5)	0.7656 (3)	0.0285 (11)
H21	0.4591	0.7565	0.7287	0.034*
C22	0.5310 (5)	0.6303 (5)	0.8242 (3)	0.0267 (11)
C23	0.6572 (5)	0.7058 (5)	0.8201 (3)	0.0293 (11)
C24	0.7223 (5)	0.7433 (6)	0.7339 (3)	0.0377 (13)
H24A	0.8030	0.7876	0.7323	0.057*
H24B	0.6621	0.8018	0.7015	0.057*
H24C	0.7424	0.6640	0.7140	0.057*
C25	0.6181 (6)	0.8344 (5)	0.8485 (3)	0.0395 (13)
H25A	0.5891	0.8128	0.9043	0.059*
H25B	0.5470	0.8818	0.8201	0.059*
H25C	0.6935	0.8892	0.8390	0.059*
C26	0.7603 (5)	0.6276 (5)	0.8714 (3)	0.0350 (12)
H26A	0.7264	0.6151	0.9263	0.052*
H26B	0.8403	0.6759	0.8619	0.052*
H26C	0.7795	0.5423	0.8583	0.052*
C27	0.5004 (5)	0.5190 (4)	0.8824 (3)	0.0234 (10)
H27	0.5543	0.4899	0.9234	0.028*
C28	0.3879 (5)	0.4494 (5)	0.8800 (3)	0.0263 (11)
C29	0.3592 (4)	−0.0251 (5)	0.9692 (3)	0.0259 (11)
H29	0.4255	−0.0085	0.9268	0.031*
C30	0.3697 (5)	−0.1417 (5)	1.0271 (3)	0.0298 (11)
H30	0.4428	−0.2010	1.0239	0.036*
C31	0.2708 (5)	−0.1692 (5)	1.0893 (3)	0.0290 (11)
H31	0.2759	−0.2474	1.1284	0.035*
C32	0.1639 (5)	−0.0781 (5)	1.0924 (3)	0.0245 (11)
H32	0.0957	−0.0949	1.1335	0.029*
C33	0.1593 (4)	0.0378 (4)	1.0338 (3)	0.0210 (10)
C34	0.0541 (4)	0.1448 (4)	1.0321 (3)	0.0202 (10)
C35	−0.0556 (5)	0.1385 (5)	1.0880 (3)	0.0250 (11)
H35	−0.0676	0.0632	1.1290	0.030*
C36	−0.1470 (5)	0.2455 (5)	1.0822 (3)	0.0278 (11)
H36	−0.2210	0.2435	1.1195	0.033*
C37	−0.1272 (5)	0.3559 (5)	1.0201 (3)	0.0267 (11)
H37	−0.1869	0.4295	1.0157	0.032*
C38	−0.0182 (5)	0.3549 (5)	0.9653 (3)	0.0265 (11)
H38	−0.0064	0.4285	0.9231	0.032*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Ru1	0.0207 (2)	0.0254 (2)	0.0202 (2)	−0.00348 (15)	0.00222 (14)	0.00001 (15)
O1	0.0239 (18)	0.0285 (18)	0.0270 (19)	−0.0015 (15)	0.0055 (14)	0.0005 (15)
O2	0.0191 (17)	0.0296 (18)	0.0230 (18)	−0.0046 (14)	0.0020 (13)	−0.0014 (14)
O3	0.0200 (17)	0.0250 (17)	0.0208 (17)	−0.0023 (14)	0.0014 (13)	−0.0002 (14)
O4	0.0244 (18)	0.0298 (18)	0.0229 (18)	−0.0054 (15)	0.0021 (14)	−0.0019 (14)
N1	0.021 (2)	0.020 (2)	0.023 (2)	−0.0054 (17)	0.0011 (16)	−0.0031 (17)
N2	0.015 (2)	0.022 (2)	0.020 (2)	−0.0029 (16)	−0.0050 (15)	0.0014 (16)
C1	0.037 (3)	0.028 (3)	0.022 (3)	−0.006 (2)	0.004 (2)	0.000 (2)
C2	0.041 (3)	0.031 (3)	0.032 (3)	−0.003 (2)	−0.004 (2)	−0.007 (2)
C3	0.055 (4)	0.037 (3)	0.029 (3)	−0.007 (3)	0.001 (3)	−0.009 (3)
C4	0.061 (4)	0.051 (4)	0.033 (3)	−0.008 (3)	−0.005 (3)	−0.011 (3)
C5	0.099 (6)	0.068 (5)	0.050 (4)	0.016 (4)	−0.030 (4)	−0.012 (4)
C6	0.088 (5)	0.044 (4)	0.035 (4)	−0.007 (4)	−0.002 (3)	0.000 (3)
C7	0.071 (5)	0.143 (8)	0.048 (4)	−0.032 (5)	−0.007 (4)	−0.026 (5)
C8	0.052 (4)	0.043 (3)	0.030 (3)	−0.003 (3)	0.007 (3)	−0.007 (3)
C9	0.041 (3)	0.037 (3)	0.031 (3)	−0.001 (3)	0.003 (2)	−0.006 (2)
C10	0.046 (4)	0.041 (3)	0.031 (3)	0.002 (3)	0.017 (3)	−0.003 (3)
C11	0.043 (4)	0.079 (5)	0.034 (3)	0.008 (3)	0.012 (3)	−0.001 (3)
C12	0.044 (4)	0.045 (4)	0.050 (4)	0.009 (3)	0.010 (3)	0.002 (3)
C13	0.042 (4)	0.052 (4)	0.044 (4)	−0.004 (3)	0.012 (3)	−0.005 (3)
C14	0.044 (3)	0.027 (3)	0.025 (3)	−0.004 (2)	0.003 (2)	−0.002 (2)
C15	0.025 (3)	0.027 (3)	0.026 (3)	0.003 (2)	0.001 (2)	−0.006 (2)
C16	0.027 (3)	0.024 (3)	0.026 (3)	0.003 (2)	−0.002 (2)	−0.002 (2)
C17	0.036 (3)	0.034 (3)	0.025 (3)	0.002 (2)	0.002 (2)	−0.001 (2)
C18	0.045 (3)	0.045 (3)	0.028 (3)	−0.003 (3)	−0.012 (2)	0.005 (3)
C19	0.031 (3)	0.055 (4)	0.035 (3)	0.012 (3)	−0.008 (2)	−0.006 (3)
C20	0.051 (4)	0.043 (3)	0.044 (4)	−0.005 (3)	−0.019 (3)	0.008 (3)
C21	0.031 (3)	0.022 (3)	0.027 (3)	0.000 (2)	0.004 (2)	0.000 (2)
C22	0.027 (3)	0.027 (3)	0.024 (3)	0.002 (2)	0.003 (2)	−0.004 (2)
C23	0.027 (3)	0.029 (3)	0.028 (3)	−0.005 (2)	0.003 (2)	−0.001 (2)
C24	0.028 (3)	0.054 (4)	0.029 (3)	−0.012 (3)	0.001 (2)	−0.003 (3)
C25	0.037 (3)	0.037 (3)	0.044 (3)	−0.005 (3)	−0.004 (3)	−0.008 (3)
C26	0.029 (3)	0.037 (3)	0.036 (3)	−0.001 (2)	−0.004 (2)	−0.001 (2)
C27	0.023 (3)	0.026 (3)	0.020 (2)	0.002 (2)	−0.0039 (19)	−0.002 (2)
C28	0.029 (3)	0.030 (3)	0.016 (2)	−0.001 (2)	0.0051 (19)	−0.002 (2)
C29	0.016 (2)	0.028 (3)	0.031 (3)	−0.001 (2)	0.002 (2)	−0.003 (2)
C30	0.023 (3)	0.027 (3)	0.040 (3)	−0.001 (2)	−0.006 (2)	−0.008 (2)
C31	0.030 (3)	0.020 (3)	0.034 (3)	−0.004 (2)	−0.006 (2)	0.004 (2)
C32	0.023 (3)	0.030 (3)	0.020 (3)	−0.007 (2)	−0.0008 (19)	−0.002 (2)
C33	0.017 (2)	0.025 (2)	0.022 (2)	−0.0087 (19)	0.0000 (18)	−0.005 (2)
C34	0.021 (2)	0.021 (2)	0.019 (2)	−0.0067 (19)	−0.0002 (18)	−0.003 (2)
C35	0.026 (3)	0.028 (3)	0.020 (3)	−0.004 (2)	−0.002 (2)	−0.002 (2)
C36	0.027 (3)	0.035 (3)	0.021 (3)	−0.002 (2)	0.000 (2)	−0.005 (2)
C37	0.021 (3)	0.026 (3)	0.032 (3)	0.005 (2)	−0.004 (2)	−0.006 (2)
C38	0.031 (3)	0.023 (3)	0.025 (3)	−0.006 (2)	−0.004 (2)	−0.003 (2)

Geometric parameters (Å, º) top

Ru1—O2	1.978 (3)	C16—C21	1.381 (6)
Ru1—O4	1.988 (3)	C16—C17	1.536 (7)
Ru1—O1	1.990 (3)	C17—C18	1.520 (7)
Ru1—O3	1.994 (3)	C17—C19	1.529 (7)
Ru1—N2	2.044 (4)	C17—C20	1.545 (7)
Ru1—N1	2.053 (4)	C18—H18A	0.9600
O1—C14	1.340 (6)	C18—H18B	0.9600
O2—C15	1.325 (5)	C18—H18C	0.9600
O3—C28	1.340 (5)	C19—H19A	0.9600
O4—C1	1.332 (6)	C19—H19B	0.9600
N1—C29	1.334 (6)	C19—H19C	0.9600
N1—C33	1.373 (6)	C20—H20A	0.9600
N2—C38	1.350 (6)	C20—H20B	0.9600
N2—C34	1.359 (5)	C20—H20C	0.9600
C1—C2	1.395 (7)	C21—C22	1.426 (7)
C1—C14	1.431 (7)	C21—H21	0.9300
C2—C3	1.379 (7)	C22—C27	1.372 (6)
C2—H2	0.9300	C22—C23	1.531 (7)
C3—C8	1.421 (8)	C23—C26	1.516 (7)
C3—C4	1.526 (7)	C23—C25	1.532 (7)
C4—C7	1.499 (9)	C23—C24	1.542 (7)
C4—C5	1.542 (9)	C24—H24A	0.9600
C4—C6	1.543 (9)	C24—H24B	0.9600
C5—H5A	0.9600	C24—H24C	0.9600
C5—H5B	0.9600	C25—H25A	0.9600
C5—H5C	0.9600	C25—H25B	0.9600
C6—H6A	0.9600	C25—H25C	0.9600
C6—H6B	0.9600	C26—H26A	0.9600
C6—H6C	0.9600	C26—H26B	0.9600
C7—H7A	0.9600	C26—H26C	0.9600
C7—H7B	0.9600	C27—C28	1.401 (6)
C7—H7C	0.9600	C27—H27	0.9300
C8—C9	1.387 (7)	C29—C30	1.386 (7)
C8—H8	0.9300	C29—H29	0.9300
C9—C14	1.421 (7)	C30—C31	1.379 (7)
C9—C10	1.518 (8)	C30—H30	0.9300
C10—C13	1.536 (8)	C31—C32	1.386 (7)
C10—C11	1.539 (7)	C31—H31	0.9300
C10—C12	1.550 (8)	C32—C33	1.382 (6)
C11—H11A	0.9600	C32—H32	0.9300
C11—H11B	0.9600	C33—C34	1.474 (6)
C11—H11C	0.9600	C34—C35	1.384 (6)
C12—H12A	0.9600	C35—C36	1.381 (7)
C12—H12B	0.9600	C35—H35	0.9300
C12—H12C	0.9600	C36—C37	1.385 (7)
C13—H13A	0.9600	C36—H36	0.9300
C13—H13B	0.9600	C37—C38	1.373 (7)
C13—H13C	0.9600	C37—H37	0.9300
C15—C16	1.425 (6)	C38—H38	0.9300
C15—C28	1.438 (6)

O2—Ru1—O4	89.04 (13)	C21—C16—C15	116.4 (4)
O2—Ru1—O1	86.32 (13)	C21—C16—C17	123.2 (4)
O4—Ru1—O1	81.90 (13)	C15—C16—C17	120.3 (4)
O2—Ru1—O3	82.41 (12)	C18—C17—C19	108.6 (4)
O4—Ru1—O3	167.90 (12)	C18—C17—C16	111.1 (4)
O1—Ru1—O3	88.99 (13)	C19—C17—C16	110.1 (4)
O2—Ru1—N2	96.44 (14)	C18—C17—C20	108.2 (4)
O4—Ru1—N2	94.41 (13)	C19—C17—C20	107.9 (4)
O1—Ru1—N2	175.38 (14)	C16—C17—C20	110.9 (4)
O3—Ru1—N2	95.04 (13)	C17—C18—H18A	109.5
O2—Ru1—N1	174.28 (14)	C17—C18—H18B	109.5
O4—Ru1—N1	93.75 (14)	H18A—C18—H18B	109.5
O1—Ru1—N1	99.00 (14)	C17—C18—H18C	109.5
O3—Ru1—N1	95.53 (13)	H18A—C18—H18C	109.5
N2—Ru1—N1	78.39 (15)	H18B—C18—H18C	109.5
C14—O1—Ru1	108.6 (3)	C17—C19—H19A	109.5
C15—O2—Ru1	109.2 (3)	C17—C19—H19B	109.5
C28—O3—Ru1	107.3 (3)	H19A—C19—H19B	109.5
C1—O4—Ru1	108.0 (3)	C17—C19—H19C	109.5
C29—N1—C33	118.2 (4)	H19A—C19—H19C	109.5
C29—N1—Ru1	125.3 (3)	H19B—C19—H19C	109.5
C33—N1—Ru1	116.5 (3)	C17—C20—H20A	109.5
C38—N2—C34	118.0 (4)	C17—C20—H20B	109.5
C38—N2—Ru1	125.1 (3)	H20A—C20—H20B	109.5
C34—N2—Ru1	116.9 (3)	C17—C20—H20C	109.5
O4—C1—C2	122.4 (5)	H20A—C20—H20C	109.5
O4—C1—C14	116.6 (4)	H20B—C20—H20C	109.5
C2—C1—C14	120.9 (5)	C16—C21—C22	124.5 (4)
C3—C2—C1	120.2 (5)	C16—C21—H21	117.7
C3—C2—H2	119.9	C22—C21—H21	117.7
C1—C2—H2	119.9	C27—C22—C21	118.4 (4)
C2—C3—C8	117.5 (5)	C27—C22—C23	122.6 (4)
C2—C3—C4	122.8 (5)	C21—C22—C23	119.0 (4)
C8—C3—C4	119.7 (5)	C26—C23—C22	113.5 (4)
C7—C4—C3	111.8 (5)	C26—C23—C25	108.0 (4)
C7—C4—C5	111.7 (6)	C22—C23—C25	108.4 (4)
C3—C4—C5	109.3 (5)	C26—C23—C24	108.1 (4)
C7—C4—C6	107.2 (6)	C22—C23—C24	110.2 (4)
C3—C4—C6	109.9 (5)	C25—C23—C24	108.4 (4)
C5—C4—C6	106.7 (5)	C23—C24—H24A	109.5
C4—C5—H5A	109.5	C23—C24—H24B	109.5
C4—C5—H5B	109.5	H24A—C24—H24B	109.5
H5A—C5—H5B	109.5	C23—C24—H24C	109.5
C4—C5—H5C	109.5	H24A—C24—H24C	109.5
H5A—C5—H5C	109.5	H24B—C24—H24C	109.5
H5B—C5—H5C	109.5	C23—C25—H25A	109.5
C4—C6—H6A	109.5	C23—C25—H25B	109.5
C4—C6—H6B	109.5	H25A—C25—H25B	109.5
H6A—C6—H6B	109.5	C23—C25—H25C	109.5
C4—C6—H6C	109.5	H25A—C25—H25C	109.5
H6A—C6—H6C	109.5	H25B—C25—H25C	109.5
H6B—C6—H6C	109.5	C23—C26—H26A	109.5
C4—C7—H7A	109.5	C23—C26—H26B	109.5
C4—C7—H7B	109.5	H26A—C26—H26B	109.5
H7A—C7—H7B	109.5	C23—C26—H26C	109.5
C4—C7—H7C	109.5	H26A—C26—H26C	109.5
H7A—C7—H7C	109.5	H26B—C26—H26C	109.5
H7B—C7—H7C	109.5	C22—C27—C28	119.8 (4)
C9—C8—C3	125.6 (5)	C22—C27—H27	120.1
C9—C8—H8	117.2	C28—C27—H27	120.1
C3—C8—H8	117.2	O3—C28—C27	122.7 (4)
C8—C9—C14	115.3 (5)	O3—C28—C15	116.2 (4)
C8—C9—C10	122.5 (5)	C27—C28—C15	121.1 (4)
C14—C9—C10	122.2 (5)	N1—C29—C30	122.5 (4)
C9—C10—C13	112.5 (5)	N1—C29—H29	118.7
C9—C10—C11	112.4 (5)	C30—C29—H29	118.7
C13—C10—C11	107.8 (5)	C31—C30—C29	119.5 (5)
C9—C10—C12	108.7 (5)	C31—C30—H30	120.3
C13—C10—C12	107.9 (5)	C29—C30—H30	120.3
C11—C10—C12	107.3 (5)	C30—C31—C32	118.7 (5)
C10—C11—H11A	109.5	C30—C31—H31	120.7
C10—C11—H11B	109.5	C32—C31—H31	120.7
H11A—C11—H11B	109.5	C33—C32—C31	119.6 (4)
C10—C11—H11C	109.5	C33—C32—H32	120.2
H11A—C11—H11C	109.5	C31—C32—H32	120.2
H11B—C11—H11C	109.5	N1—C33—C32	121.5 (4)
C10—C12—H12A	109.5	N1—C33—C34	113.6 (4)
C10—C12—H12B	109.5	C32—C33—C34	124.8 (4)
H12A—C12—H12B	109.5	N2—C34—C35	121.9 (4)
C10—C12—H12C	109.5	N2—C34—C33	114.5 (4)
H12A—C12—H12C	109.5	C35—C34—C33	123.6 (4)
H12B—C12—H12C	109.5	C36—C35—C34	119.1 (4)
C10—C13—H13A	109.5	C36—C35—H35	120.4
C10—C13—H13B	109.5	C34—C35—H35	120.4
H13A—C13—H13B	109.5	C35—C36—C37	119.2 (5)
C10—C13—H13C	109.5	C35—C36—H36	120.4
H13A—C13—H13C	109.5	C37—C36—H36	120.4
H13B—C13—H13C	109.5	C38—C37—C36	119.0 (4)
O1—C14—C9	124.0 (5)	C38—C37—H37	120.5
O1—C14—C1	115.6 (4)	C36—C37—H37	120.5
C9—C14—C1	120.4 (5)	N2—C38—C37	122.7 (4)
O2—C15—C16	124.3 (4)	N2—C38—H38	118.7
O2—C15—C28	116.2 (4)	C37—C38—H38	118.7
C16—C15—C28	119.5 (4)

Ru1—O4—C1—C2	−160.9 (4)	C17—C16—C21—C22	−176.7 (5)
Ru1—O4—C1—C14	23.0 (5)	C16—C21—C22—C27	−4.8 (7)
O4—C1—C2—C3	−178.9 (5)	C16—C21—C22—C23	175.5 (5)
C14—C1—C2—C3	−3.0 (8)	C27—C22—C23—C26	15.3 (7)
C1—C2—C3—C8	3.5 (8)	C21—C22—C23—C26	−165.0 (4)
C1—C2—C3—C4	−173.5 (5)	C27—C22—C23—C25	−104.6 (5)
C2—C3—C4—C7	−11.4 (9)	C21—C22—C23—C25	75.1 (6)
C8—C3—C4—C7	171.7 (6)	C27—C22—C23—C24	136.8 (5)
C2—C3—C4—C5	112.8 (6)	C21—C22—C23—C24	−43.5 (6)
C8—C3—C4—C5	−64.1 (7)	C21—C22—C27—C28	4.4 (7)
C2—C3—C4—C6	−130.4 (6)	C23—C22—C27—C28	−175.9 (4)
C8—C3—C4—C6	52.7 (7)	Ru1—O3—C28—C27	−158.8 (4)
C2—C3—C8—C9	−1.8 (9)	Ru1—O3—C28—C15	23.9 (5)
C4—C3—C8—C9	175.3 (6)	C22—C27—C28—O3	−177.2 (4)
C3—C8—C9—C14	−0.5 (8)	C22—C27—C28—C15	0.0 (7)
C3—C8—C9—C10	−179.4 (5)	O2—C15—C28—O3	−4.9 (6)
C8—C9—C10—C13	122.6 (6)	C16—C15—C28—O3	173.0 (4)
C14—C9—C10—C13	−56.3 (7)	O2—C15—C28—C27	177.7 (4)
C8—C9—C10—C11	0.7 (8)	C16—C15—C28—C27	−4.4 (7)
C14—C9—C10—C11	−178.2 (5)	C33—N1—C29—C30	−1.2 (6)
C8—C9—C10—C12	−117.9 (6)	Ru1—N1—C29—C30	179.4 (3)
C14—C9—C10—C12	63.2 (7)	N1—C29—C30—C31	1.4 (7)
Ru1—O1—C14—C9	161.2 (4)	C29—C30—C31—C32	−0.5 (7)
Ru1—O1—C14—C1	−19.8 (5)	C30—C31—C32—C33	−0.5 (7)
C8—C9—C14—O1	180.0 (5)	C29—N1—C33—C32	0.1 (6)
C10—C9—C14—O1	−1.0 (8)	Ru1—N1—C33—C32	179.5 (3)
C8—C9—C14—C1	1.0 (8)	C29—N1—C33—C34	178.4 (4)
C10—C9—C14—C1	180.0 (5)	Ru1—N1—C33—C34	−2.1 (5)
O4—C1—C14—O1	−2.3 (7)	C31—C32—C33—N1	0.8 (6)
C2—C1—C14—O1	−178.4 (4)	C31—C32—C33—C34	−177.4 (4)
O4—C1—C14—C9	176.8 (4)	C38—N2—C34—C35	1.8 (6)
C2—C1—C14—C9	0.7 (8)	Ru1—N2—C34—C35	−176.8 (3)
Ru1—O2—C15—C16	165.0 (4)	C38—N2—C34—C33	−178.7 (4)
Ru1—O2—C15—C28	−17.2 (5)	Ru1—N2—C34—C33	2.7 (5)
O2—C15—C16—C21	−178.2 (4)	N1—C33—C34—N2	−0.4 (5)
C28—C15—C16—C21	4.0 (7)	C32—C33—C34—N2	177.9 (4)
O2—C15—C16—C17	−1.0 (7)	N1—C33—C34—C35	179.1 (4)
C28—C15—C16—C17	−178.8 (4)	C32—C33—C34—C35	−2.6 (7)
C21—C16—C17—C18	116.4 (5)	N2—C34—C35—C36	−2.1 (6)
C15—C16—C17—C18	−60.6 (6)	C33—C34—C35—C36	178.5 (4)
C21—C16—C17—C19	−123.2 (5)	C34—C35—C36—C37	0.6 (7)
C15—C16—C17—C19	59.8 (6)	C35—C36—C37—C38	1.1 (7)
C21—C16—C17—C20	−4.0 (7)	C34—N2—C38—C37	−0.1 (6)
C15—C16—C17—C20	179.0 (5)	Ru1—N2—C38—C37	178.4 (3)
C15—C16—C21—C22	0.4 (7)	C36—C37—C38—N2	−1.3 (7)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C30—H30···O3ⁱ	0.93	2.54	3.427 (6)	159
C32—H32···O4ⁱⁱ	0.93	2.49	3.322 (6)	148
C35—H35···O4ⁱⁱ	0.93	2.39	3.232 (6)	151

Symmetry codes: (i) −x+1, −y, −z+2; (ii) −x, −y, −z+2.

Acknowledgements

The authors are grateful to Dr Igor Fritsky and Dr Musheer Ahmad for important discussions.

Funding information

Funding for this research was provided by: National Taras Shevchenko University, Department of Chemistry

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