Crystal structure of tris­(trans-1,2-di­amino­cyclo­hexane-κ2N,N′)cobalt(III) trichloride monohydrate

Gallagher, M.K.; Oliver, A.G.; Lappin, A.G.

doi:10.1107/S2056989015023683

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Volume 72| Part 1| January 2016| Pages 49-52

doi:10.1107/S2056989015023683

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Crystal structure of tris(trans-1,2-diaminocyclohexane-κ²N,N′)cobalt(III) trichloride monohydrate

Megan K. Gallagher,^a Allen G. Oliver ^a and A. Graham Lappin ^a ^*

^aDepartment of Chemistry & Biochemistry, University of Notre Dame, Notre Dame, IN 46556-5670, USA
^*Correspondence e-mail: alappin@nd.edu

Edited by A. J. Lough, University of Toronto, Canada (Received 16 November 2015; accepted 9 December 2015; online 1 January 2016)

The synthesis of the title hydrated complex salt, [Co(C₆H₁₄N₂)₃]Cl₃·H₂O, from racemic trans-1,2-diaminocyclohexane and [CoCl(NH₃)₅]Cl₂ and its structural characterization are presented in this paper. The product was synthesized in the interest of understanding the hydrogen-bonding patterns of coordination complexes. Previous characterizations of the product in the I-42d space group have not yielded coordinates; thus, this paper provides the first coordinates for this complex in this space group. The octahedrally coordinated cation adopts twofold rotation symmetry, with outer-sphere chloride counter-ions and solvent water molecules forming a hydrogen-bonded network with amine H atoms.

Keywords: crystal structure; cobalt(III); 1,2-diaminocyclohexane; coordination complex; hydrogen-bonding patterns.

CCDC reference: 1441534

1. Chemical context

We are interested in the hydrogen-bonding patterns of various coordination complexes, especially those that incorporate optically active ligands, where the role of hydrogen bonding in the chiral discrimination between coordination complexes is important. As part of our studies, we prepared the title complex by the reaction of racemic trans-(R,R,S,S)-1,2-diaminocyclohexane with [Co(NH₃)₅Cl]²⁺ in aqueous solution at 323 K. The resulting complex is a racemic mixture and does not exhibit optical activity. Isolation of optically active forms is being undertaken.

This complex was first reported in 1937 (Jaeger & Bijkerk, 1937 ) and by optical crystallography and X-ray diffraction, the space group was determined to be P6₁ and/or P6₅. There have been several, successive studies on this compound, and all are reported in a variety of space groups and configurations of the ligand (P6₁₍₅₎: Jaeger & Bijkerk, 1937; [lel₃] Marumo et al., 1970 ; [lel₂ob] Sato & Saito, 1977 ; C2: [ob₃] Kobayashi et al., 1972 ; R32: [ob₃] Kobayashi et al., 1983 ; I $[\overline{4}]$ 2d, Andersen et al., 1973 ). Note: the 1983 Kobyashi article is a correction of the space group reported for the 1972 paper. The Andersen structure was a unit-cell determination and heavy-atom coordinate prediction based on powder diffraction data. No coordinates are available for that structure. Herein, we report the structural characterization of tris(trans-1,2 diaminocyclohexane)cobalt(III) chloride monohydrate in I $[\overline{4}]$ 2d.

2. Structural commentary

The cation crystallizes on a twofold rotation axis at [x, 0.25, 0.625], thus, only half of the cation is represented in the asymmetric unit (Fig. 1). One chloride is located on the twofold axis at [0.75, y, 0.875] and the remaining independent chloride anion occupies a general position within the lattice. The water molecule of crystallization is also in a general position, but was modeled as a partial occupancy species (vide infra). The 1,2-diaminocyclohexane ligands adopt a lel₃, Δ (λ,λ,λ) configuration with the (R,R)-ligand in the featured example. The cobalt atom adopts an octahedral coordination environment with only small distortions from an ideal geometry (Table 1). The 1,2-diaminocyclohexane ligands are unexceptional.

Table 1
Selected geometric parameters (Å, °)

Co1—N1	1.959 (4)	Co1—N2	1.974 (4)
Co1—N1ⁱ	1.959 (4)	Co1—N3ⁱ	1.980 (4)
Co1—N2ⁱ	1.974 (4)	Co1—N3	1.980 (4)

N1—Co1—N1ⁱ	92.2 (3)	N2ⁱ—Co1—N3ⁱ	92.64 (19)
N1—Co1—N2ⁱ	90.61 (19)	N2—Co1—N3ⁱ	91.62 (19)
N1ⁱ—Co1—N2ⁱ	85.4 (2)	N1—Co1—N3	175.8 (2)
N1—Co1—N2	85.4 (2)	N1ⁱ—Co1—N3	91.58 (17)
N1ⁱ—Co1—N2	90.61 (19)	N2ⁱ—Co1—N3	91.62 (19)
N2ⁱ—Co1—N2	174.2 (3)	N2—Co1—N3	92.64 (19)
N1—Co1—N3ⁱ	91.58 (17)	N3ⁱ—Co1—N3	84.7 (3)
N1ⁱ—Co1—N3ⁱ	175.8 (2)
Symmetry code: (i) $[x, -y+{\script{1\over 2}}, -z+{\script{5\over 4}}]$ .

Figure 1
Labeling scheme for (I)

. Atomic displacement parameters are depicted at the 50% probability level. [Symmetry code: (i) x, −y + $[{1\over 2}]$ , −z + $[{5\over 4}]$ .]

3. Comparison with previously reported structures

An inspection of the structure and comparison with the Marumo lel₃ complex gives an r.m.s. fit of 0.0706 for the cobalt and nitrogen atoms (Marumo et al., 1970; Macrae et al., 2006 ). The predominant difference between the Marumo structure and that reported here is the molecular symmetry. The Marumo structure adopts C₃ symmetry, with only one unique ligand. The structure herein adopts C₂ symmetry with one complete and one half ligand in the asymmetric unit.

Perhaps the most surprising change when compared with the Andersen structure is the contraction in cell parameters and overall cell-volume reduction. The cell parameters reported by Andersen are a = 19.208, c = 13.908 Å, V = 5131.3 Å³ (Andersen et al., 1973). Our study has a = 18.786, c = 13.857 Å and V = 4830.3 Å³. This change represents a 4.6% reduction in cell volume, with a and b contracting in a concerted fashion by nearly 0.5 Å. Typically one might expect a contraction of around 0.1 to 0.2 Å upon cooling, similar to that observed for the change in c. This observation led us to undertake variable temperature studies to determine if this was actually the case. Data on a crystal of the title compound were recorded at 120 K, 250 K and 293 K. Cell parameters and refinement statistics are given in Table 2. It should be noted that the redetermination of the unit cell at room temperature with a single crystal sample yielded a unit cell that is approximately 100 Å³ smaller in volume than that calculated originally from powder diffraction data.

Table 2
Comparison of 120, 250, and 293 K data sets

	120 K	250 K	293 K
a, c (Å)	18.960 (3), 13.642 (2)	19.039 (9), 13.651 (7)	19.210 (10), 13.567 (8)
Vol (Å³)	4903.8	4948.6	5007.1
% Vol change (w.r.t. 293 K)	2.1	1.2	0.0
R[F² > 2σ(F²)], wR(F²), S	0.0525, 0.1401, 1.028	0.0386, 0.1078, 1.029	0.0586, 0.1617, 1.017
Data recorded on a second crystal selected from same batch. Crystal showed signs of degradation at higher temperatures, presumably due to solvent loss. Inspection of the crystal after 293 K data set showed fracturing within the crystal.

4. Supramolecular features

The complex forms a hydrogen-bonded network with the amino nitrogen atoms on the cation serving as donors to nearby chlorine atoms and the water molecule (Fig. 2, Table 3). Although the water hydrogen atoms could not be located, there are contacts to nearby chlorine atoms from the oxygen atom at reasonable hydrogen-bond contact distances (Table 3). Close inspection of the Fourier difference map reveals several locations for potential hydrogen-atom sites on the water oxygen. However, none of these sites refines suitably when modeled as a hydrogen atom. Further exacerbating this situation is the disorder apparent with this lattice water molecule, because through symmetry there is another water oxygen atom located only 2.11 Å distant. Clearly this is unreasonable and reflects the disorder in this molecule. The water of crystallization and chlorine anions are arranged within discrete pockets within the lattice. Other contacts are simple van der Waals interactions.

Table 3
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1A⋯Cl1ⁱⁱ	0.91	2.46	3.270 (5)	148
N1—H1B⋯Cl1	0.91	2.33	3.222 (5)	167
N2—H2A⋯Cl2ⁱⁱⁱ	0.91	2.57	3.433 (5)	159
N2—H2B⋯O1	0.91	2.35	3.019 (14)	130
N3—H3A⋯Cl2	0.91	2.46	3.352 (5)	167
N3—H3B⋯Cl1ⁱ	0.91	2.36	3.223 (5)	158
O1⋯Cl1ⁱ			3.296 (18)
O1⋯Cl1^iv			3.393 (15)
O1⋯Cl1^v			3.287 (12)
C2—H2⋯Cl1^iv	1.00	2.78	3.772 (10)	173
C3—H3C⋯O1	0.99	2.37	3.039 (15)	124
C8—H8A⋯Cl1^vi	0.99	2.86	3.780 (6)	156
C8—H8B⋯Cl2	0.99	2.94	3.762 (6)	141
Symmetry codes: (i) $[x, -y+{\script{1\over 2}}, -z+{\script{5\over 4}}]$ ; (ii) y+1, -x+1, -z+1; (iii) $[-x+{\script{3\over 2}}, -y+{\script{1\over 2}}, z-{\script{1\over 2}}]$ ; (iv) $[y+1, x-{\script{1\over 2}}, z+{\script{1\over 4}}]$ ; (v) $[-y+1, -x+{\script{3\over 2}}, z+{\script{1\over 4}}]$ ; (vi) $[-x+{\script{3\over 2}}, -y+{\script{1\over 2}}, z+{\script{1\over 2}}]$ .

Figure 2
Packing diagram of (I)

, viewed along the c axis. Hydrogen bonds are shown as dashed lines.

5. Database survey

This structure was first reported in 1937 (Jaeger & Bijkerk, 1937) with the space group P6₁ and P6₅ at room temperature. Other reports of the structure with the P6₁ space group were in 1970 (Marumo et al., 1970) and 1977 (Sato & Saito, 1977), both at room temperature. The structure was also reported in 1972 (Kobayashi et al., 1972) with the C2 space group and 1983 (Kobayashi et al., 1983) with the R32 space group. The first report of the structure with the I $[\overline{4}]$ 2d space group was in 1973 (Andersen et al., 1973). This structure is at room temperature and no coordinates were provided by the authors. The structure presented in this paper has the same I $[\overline{4}]$ 2d space group and provides coordinates for the structure at cryogenic temperatures.

6. Synthesis and crystallization

0.56 g of [Co(NH₃)₅Cl]Cl₂ was dissolved in 200 mL of DI water and allowed to stand overnight. 1.54 g of racemic trans-(R,R,S,S)1,2-diaminocyclohexane was added along with a small amount of charcoal. The mixture was stirred and heated at 313–323K for 2 d. The solution was filtered through a SP Sephadex C25 column. Using first 0.01 M HCl then 1 M HCl, the product was collected from the column. The fractions were placed in evaporation dishes and allowed to dry for three weeks. Orange crystals formed in the evaporation dish and were harvested for analysis.

7. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 4. All non-hydrogen atoms were refined with anisotropic atomic displacement parameters. Hydrogen atoms were included in geometrically calculated positions with U_iso(H) = 1.2U_eq(C/N). C—H distances were fixed at 0.95 Å and N—H distances fixed at 0.91 Å.

Table 4
Experimental details

Crystal data
Chemical formula	[Co(C₆H₁₄N₂)₃]Cl₃·H₂O
M_r	525.87
Crystal system, space group	Tetragonal, I $[\overline{4}]$ 2d
Temperature (K)	120
a, c (Å)	18.7857 (14), 13.8572 (12)
V (Å³)	4890.2 (9)
Z	8
Radiation type	Mo Kα
μ (mm⁻¹)	1.05
Crystal size (mm)	0.22 × 0.06 × 0.05

Data collection
Diffractometer	Bruker APEXII
Absorption correction	Numerical (SADABS; Krause et al., 2015 )
T_min, T_max	0.809, 0.926
No. of measured, independent and observed [I > 2σ(I)] reflections	43332, 2707, 2416
R_int	0.068
(sin θ/λ)_max (Å⁻¹)	0.642

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.047, 0.130, 1.06
No. of reflections	2707
No. of parameters	137
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	1.14, −0.62
Absolute structure	Flack x determined using 1004 quotients [(I⁺)−(I⁻)]/[(I⁺)+(I⁻)] (Parsons et al., 2013 ).
Absolute structure parameter	0.003 (7)
Computer programs: APEX2 and SAINT (Bruker, 2015 ), SHELXT (Sheldrick, 2015a ), SHELXL2014 (Sheldrick, 2015b ), OLEX2 (Dolomanov et al., 2009 ) and publCIF (Westrip, 2010 ).

The water of crystallization was determined to be partially occupied by inspection of the displacement parameters during refinement. The occupancy was set to 50% in the final model which yielded reasonable displacement parameters. Hydrogen atoms could not be located or reliably modeled on the water molecule, but have been included in the chemical formula for completeness.

Supporting information

CCDC reference: 1441534

Crystal structure: contains datablock I. DOI: 10.1107/S2056989015023683/lh5797sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S2056989015023683/lh5797Isup2.hkl

checkCIF report

Computing details top

Data collection: APEX2 (Bruker, 2015); cell refinement: SAINT (Bruker, 2015); data reduction: SAINT (Bruker, 2015); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014 (Sheldrick, 2015b); molecular graphics: OLEX2 (Dolomanov et al., 2009); software used to prepare material for publication: OLEX2 (Dolomanov et al., 2009) and publCIF (Westrip, 2010).

Tris(trans-1,2-diaminocyclohexane-κ²N,N')cobalt(III) trichloride monohydrate top

Crystal data top

[Co(C₆H₁₄N₂)₃]Cl₃·H₂O	D_x = 1.429 Mg m⁻³
M_r = 525.87	Mo Kα radiation, λ = 0.71073 Å
Tetragonal, I42d	Cell parameters from 9897 reflections
a = 18.7857 (14) Å	θ = 2.8–24.8°
c = 13.8572 (12) Å	µ = 1.05 mm⁻¹
V = 4890.2 (9) Å³	T = 120 K
Z = 8	Rod, orange
F(000) = 2240	0.22 × 0.06 × 0.05 mm

Data collection top

Bruker APEXII diffractometer	2707 independent reflections
Radiation source: fine-focus sealed tube	2416 reflections with I > 2σ(I)
Bruker TRIUMPH curved-graphite monochromator	R_int = 0.068
Detector resolution: 8.33 pixels mm^-1	θ_max = 27.2°, θ_min = 1.8°
combination of ω and φ–scans	h = −24→24
Absorption correction: numerical (SADABS; Krause et al., 2015)	k = −24→24
T_min = 0.809, T_max = 0.926	l = −17→17
43332 measured reflections

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.047	H-atom parameters constrained
wR(F²) = 0.130	w = 1/[σ²(F_o²) + (0.0844P)² + 6.4309P] where P = (F_o² + 2F_c²)/3
S = 1.06	(Δ/σ)_max = 0.010
2707 reflections	Δρ_max = 1.14 e Å⁻³
137 parameters	Δρ_min = −0.62 e Å⁻³
0 restraints	Absolute structure: Flack x determined using 1004 quotients [(I⁺)-(I^-)]/[(I⁺)+(I^-)] (Parsons et al., 2013).
Primary atom site location: structure-invariant direct methods	Absolute structure parameter: 0.003 (7)

Special details top

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s 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)
Co1	0.86364 (5)	0.2500	0.6250	0.0199 (2)
Cl1	0.85979 (10)	0.08706 (8)	0.43019 (16)	0.0553 (5)
Cl2	0.7500	0.15300 (10)	0.8750	0.0324 (4)
N1	0.9360 (2)	0.2216 (2)	0.5307 (3)	0.0265 (9)
H1A	0.9779	0.2126	0.5612	0.032*
H1B	0.9219	0.1813	0.4996	0.032*
N2	0.8689 (2)	0.3445 (2)	0.5631 (4)	0.0289 (10)
H2A	0.8301	0.3513	0.5249	0.035*
H2B	0.8693	0.3791	0.6090	0.035*
N3	0.7858 (2)	0.2801 (2)	0.7122 (3)	0.0239 (9)
H3A	0.7819	0.2488	0.7621	0.029*
H3B	0.7956	0.3238	0.7370	0.029*
C1	0.9455 (5)	0.2804 (4)	0.4598 (6)	0.057 (2)
H1	0.9047	0.2750	0.4141	0.068*
C2	0.9338 (4)	0.3487 (5)	0.5050 (7)	0.063 (2)
H2	0.9740	0.3562	0.5511	0.075*
C3	0.9375 (4)	0.4089 (4)	0.4326 (7)	0.060 (2)
H3C	0.9309	0.4549	0.4662	0.071*
H3D	0.8986	0.4036	0.3849	0.071*
C4	1.0086 (5)	0.4087 (6)	0.3809 (9)	0.092 (4)
H4A	1.0473	0.4181	0.4277	0.110*
H4B	1.0094	0.4468	0.3316	0.110*
C5	1.0206 (5)	0.3362 (5)	0.3323 (6)	0.065 (2)
H5A	0.9874	0.3319	0.2772	0.078*
H5B	1.0696	0.3351	0.3061	0.078*
C6	1.0107 (3)	0.2723 (4)	0.3971 (4)	0.0418 (17)
H6A	1.0058	0.2289	0.3570	0.050*
H6B	1.0532	0.2665	0.4385	0.050*
C7	0.7181 (3)	0.2825 (3)	0.6575 (4)	0.0251 (10)
H7	0.7186	0.3259	0.6157	0.030*
C8	0.6525 (3)	0.2853 (3)	0.7199 (4)	0.0311 (12)
H8A	0.6529	0.3296	0.7587	0.037*
H8B	0.6523	0.2443	0.7648	0.037*
C9	0.5856 (3)	0.2833 (3)	0.6569 (5)	0.0359 (13)
H9A	0.5840	0.3263	0.6157	0.043*
H9B	0.5428	0.2833	0.6985	0.043*
O1	0.9506 (10)	0.4729 (6)	0.6332 (9)	0.104 (6)	0.5

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Co1	0.0181 (4)	0.0195 (4)	0.0221 (4)	0.000	0.000	−0.0026 (4)
Cl1	0.0471 (9)	0.0311 (8)	0.0877 (13)	−0.0106 (7)	0.0231 (10)	−0.0252 (8)
Cl2	0.0324 (9)	0.0358 (10)	0.0291 (9)	0.000	0.0006 (8)	0.000
N1	0.023 (2)	0.030 (2)	0.027 (2)	0.0010 (18)	0.0021 (17)	−0.0049 (18)
N2	0.022 (2)	0.024 (2)	0.041 (2)	−0.0001 (18)	−0.003 (2)	0.0034 (18)
N3	0.023 (2)	0.024 (2)	0.025 (2)	0.0015 (18)	0.0006 (17)	−0.0056 (17)
C1	0.071 (5)	0.043 (4)	0.055 (4)	0.003 (4)	0.032 (4)	0.013 (3)
C2	0.050 (4)	0.058 (5)	0.080 (6)	0.014 (4)	0.023 (4)	0.035 (4)
C3	0.030 (3)	0.057 (5)	0.091 (6)	−0.003 (3)	−0.006 (4)	0.046 (4)
C4	0.055 (5)	0.104 (9)	0.117 (9)	−0.008 (5)	0.008 (6)	0.070 (8)
C5	0.068 (5)	0.086 (7)	0.042 (4)	−0.026 (5)	0.017 (4)	0.014 (4)
C6	0.026 (3)	0.074 (5)	0.026 (3)	−0.001 (3)	0.000 (2)	0.009 (3)
C7	0.020 (2)	0.027 (2)	0.029 (2)	0.000 (2)	−0.0004 (19)	−0.002 (2)
C8	0.025 (3)	0.037 (3)	0.031 (3)	0.005 (2)	0.004 (2)	−0.001 (2)
C9	0.025 (3)	0.036 (3)	0.047 (3)	0.005 (2)	0.005 (2)	0.003 (3)
O1	0.206 (18)	0.049 (6)	0.058 (7)	0.026 (9)	−0.076 (10)	−0.016 (6)

Geometric parameters (Å, º) top

Co1—N1	1.959 (4)	C3—C4	1.516 (12)
Co1—N1ⁱ	1.959 (4)	C3—H3C	0.9900
Co1—N2ⁱ	1.974 (4)	C3—H3D	0.9900
Co1—N2	1.974 (4)	C4—C5	1.536 (15)
Co1—N3ⁱ	1.980 (4)	C4—H4A	0.9900
Co1—N3	1.980 (4)	C4—H4B	0.9900
N1—C1	1.489 (8)	C5—C6	1.510 (11)
N1—H1A	0.9100	C5—H5A	0.9900
N1—H1B	0.9100	C5—H5B	0.9900
N2—C2	1.462 (9)	C6—H6A	0.9900
N2—H2A	0.9100	C6—H6B	0.9900
N2—H2B	0.9100	C7—C8	1.506 (7)
N3—C7	1.482 (6)	C7—C7ⁱ	1.516 (10)
N3—H3A	0.9100	C7—H7	1.0000
N3—H3B	0.9100	C8—C9	1.531 (8)
C1—C2	1.445 (12)	C8—H8A	0.9900
C1—C6	1.508 (9)	C8—H8B	0.9900
C1—H1	1.0000	C9—C9ⁱ	1.532 (13)
C2—C3	1.513 (9)	C9—H9A	0.9900
C2—H2	1.0000	C9—H9B	0.9900

N1—Co1—N1ⁱ	92.2 (3)	C3—C2—H2	106.6
N1—Co1—N2ⁱ	90.61 (19)	C2—C3—C4	110.6 (6)
N1ⁱ—Co1—N2ⁱ	85.4 (2)	C2—C3—H3C	109.5
N1—Co1—N2	85.4 (2)	C4—C3—H3C	109.5
N1ⁱ—Co1—N2	90.61 (19)	C2—C3—H3D	109.5
N2ⁱ—Co1—N2	174.2 (3)	C4—C3—H3D	109.5
N1—Co1—N3ⁱ	91.58 (17)	H3C—C3—H3D	108.1
N1ⁱ—Co1—N3ⁱ	175.8 (2)	C3—C4—C5	109.9 (8)
N2ⁱ—Co1—N3ⁱ	92.64 (19)	C3—C4—H4A	109.7
N2—Co1—N3ⁱ	91.62 (19)	C5—C4—H4A	109.7
N1—Co1—N3	175.8 (2)	C3—C4—H4B	109.7
N1ⁱ—Co1—N3	91.58 (17)	C5—C4—H4B	109.7
N2ⁱ—Co1—N3	91.62 (19)	H4A—C4—H4B	108.2
N2—Co1—N3	92.64 (19)	C6—C5—C4	115.2 (7)
N3ⁱ—Co1—N3	84.7 (3)	C6—C5—H5A	108.5
C1—N1—Co1	108.8 (4)	C4—C5—H5A	108.5
C1—N1—H1A	109.9	C6—C5—H5B	108.5
Co1—N1—H1A	109.9	C4—C5—H5B	108.5
C1—N1—H1B	109.9	H5A—C5—H5B	107.5
Co1—N1—H1B	109.9	C1—C6—C5	111.2 (7)
H1A—N1—H1B	108.3	C1—C6—H6A	109.4
C2—N2—Co1	109.3 (4)	C5—C6—H6A	109.4
C2—N2—H2A	109.8	C1—C6—H6B	109.4
Co1—N2—H2A	109.8	C5—C6—H6B	109.4
C2—N2—H2B	109.8	H6A—C6—H6B	108.0
Co1—N2—H2B	109.8	N3—C7—C8	114.1 (4)
H2A—N2—H2B	108.3	N3—C7—C7ⁱ	106.2 (3)
C7—N3—Co1	109.3 (3)	C8—C7—C7ⁱ	111.7 (4)
C7—N3—H3A	109.8	N3—C7—H7	108.2
Co1—N3—H3A	109.8	C8—C7—H7	108.2
C7—N3—H3B	109.8	C7ⁱ—C7—H7	108.2
Co1—N3—H3B	109.8	C7—C8—C9	110.0 (4)
H3A—N3—H3B	108.3	C7—C8—H8A	109.7
C2—C1—N1	110.7 (6)	C9—C8—H8A	109.7
C2—C1—C6	117.6 (7)	C7—C8—H8B	109.7
N1—C1—C6	113.7 (6)	C9—C8—H8B	109.7
C2—C1—H1	104.4	H8A—C8—H8B	108.2
N1—C1—H1	104.4	C8—C9—C9ⁱ	110.4 (4)
C6—C1—H1	104.4	C8—C9—H9A	109.6
C1—C2—N2	108.5 (7)	C9ⁱ—C9—H9A	109.6
C1—C2—C3	111.6 (7)	C8—C9—H9B	109.6
N2—C2—C3	116.4 (6)	C9ⁱ—C9—H9B	109.6
C1—C2—H2	106.6	H9A—C9—H9B	108.1
N2—C2—H2	106.6

Co1—N1—C1—C2	32.0 (8)	C2—C3—C4—C5	56.6 (11)
Co1—N1—C1—C6	167.1 (5)	C3—C4—C5—C6	−51.3 (11)
N1—C1—C2—N2	−45.9 (10)	C2—C1—C6—C5	−43.7 (10)
C6—C1—C2—N2	−179.1 (6)	N1—C1—C6—C5	−175.6 (6)
N1—C1—C2—C3	−175.5 (6)	C4—C5—C6—C1	43.1 (10)
C6—C1—C2—C3	51.3 (11)	Co1—N3—C7—C8	164.5 (4)
Co1—N2—C2—C1	37.8 (8)	Co1—N3—C7—C7ⁱ	41.0 (6)
Co1—N2—C2—C3	164.7 (7)	N3—C7—C8—C9	−176.7 (5)
C1—C2—C3—C4	−57.2 (11)	C7ⁱ—C7—C8—C9	−56.2 (7)
N2—C2—C3—C4	177.5 (9)	C7—C8—C9—C9ⁱ	57.0 (7)

Symmetry code: (i) x, −y+1/2, −z+5/4.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N1—H1A···Cl1ⁱⁱ	0.91	2.46	3.270 (5)	148
N1—H1B···Cl1	0.91	2.33	3.222 (5)	167
N2—H2A···Cl2ⁱⁱⁱ	0.91	2.57	3.433 (5)	159
N2—H2B···O1	0.91	2.35	3.019 (14)	130
N3—H3A···Cl2	0.91	2.46	3.352 (5)	167
N3—H3B···Cl1ⁱ	0.91	2.36	3.223 (5)	158
O1···Cl1ⁱ			3.296 (18)
O1···Cl1^iv			3.393 (15)
O1···Cl1^v			3.287 (12)
C2—H2···Cl1^iv	1.00	2.78	3.772 (10)	173
C3—H3C···O1	0.99	2.37	3.039 (15)	124
C8—H8A···Cl1^vi	0.99	2.86	3.780 (6)	156
C8—H8B···Cl2	0.99	2.94	3.762 (6)	141

Symmetry codes: (i) x, −y+1/2, −z+5/4; (ii) y+1, −x+1, −z+1; (iii) −x+3/2, −y+1/2, z−1/2; (iv) y+1, x−1/2, z+1/4; (v) −y+1, −x+3/2, z+1/4; (vi) −x+3/2, −y+1/2, z+1/2.

Comparison of 120, 250, and 293 K data sets top

	120 K	250 K	293 K
a, c (Å)	18.960 (3), 13.642 (2)	19.039 (9), 13.651 (7)	19.210 (10), 13.567 (8)
Vol (Å³)	4903.8	4948.6	5007.1
% Vol change (w.r.t. 293 K)	2.1	1.2	0.0
R[F² > 2σ(F²)], wR(F²), S	0.0525, 0.1401, 1.028	0.0386, 0.1078, 1.029	0.0586, 0.1617, 1.017

Data recorded on a second crystal selected from same batch. Crystal showed signs of degradation at higher temperatures, presumably due to solvent loss. Inspection of the crystal after 293 K data set showed fracturing within the crystal.

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