Crystal structure of bromido(η6-1-isopropyl-4-methylbenzene)(7-oxocyclohepta-1,3,5-trien-1-olato-κ2O,O′)osmium

Clayton, H.S.; Tapala, K.C.; Lemmerer, A.

doi:10.1107/S2056989018001391

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ISSN: 2056-9890

Volume 74| Part 3| March 2018| Pages 275-277

https://doi.org/10.1107/S2056989018001391

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Crystal structure of bromido(η⁶-1-isopropyl-4-methylbenzene)(7-oxocyclohepta-1,3,5-trien-1-olato-κ²O,O′)osmium

Hadley S. Clayton,^a ^* Kgaugelo C. Tapala ^a and Andreas Lemmerer ^b

^aChemistry Department, University of South Africa, Pretoria, 0003, South Africa, and ^bMolecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag, PO WITS, 2050, Johannesburg, South Africa
^*Correspondence e-mail: clayths@unisa.ac.za

Edited by W. T. A. Harrison, University of Aberdeen, Scotland (Received 29 November 2017; accepted 22 January 2018; online 2 February 2018)

In the title compound, [OsBr(C₁₀H₁₄)(C₇H₅O₂)], the central Os^II ion is ligated by a hexahaptic η⁶ p-cymene ring, a Br⁻ ligand and two O atoms of a chelating tropolonate group. The p-cymene ligand presents more than one conformation, giving rise to a discrete disorder, which was modelled with two different orientations with occupancy values of 0.561 (15) and 0.439 (15). The crystal packing features C—H⋯O and C—H⋯Br hydrogen bonding. Aromatic π–π stacking interactions are also observed between adjacent non-benzenoid aromatic tropolone rings.

Keywords: crystal structure; osmium(II) complex; tropolonato; cymene ligand.

CCDC reference: 1818437

1. Chemical context

The chemistry of half-sandwich organometallic Os^II–arene complexes with O-donor ligands has drawn considerable interest because of their potential application as anticancer agents (Zhang & Sadler, 2017 ). In particular, several complexes of this type with O,O- and N,O-chelating ligands have been investigated (Hanif et al., 2010 ; van Rijt et al., 2009 ). While the complexes with N,O-ligands have shown in vitro anticancer activity comparable to Cisplatin, the benchmark anticancer metallopharmaceutical, complexes with O,O-ligands exhibit low activity. This has been attributed to the poor stability of these complexes in aqueous solution and the formation of inactive hydroxy-bridged dimers (Hanif et al., 2014 ). The mechanism of the cytotoxic action of the Os^II–arene complexes is generally thought to involve hydrolysis of the Os—X bond (where X = a halide ligand) to generate an active Os–OH₂ species, which binds to biomolecules leading to cellular dysfunction and consequently triggering apoptosis. While the anticancer activity of the Os^II–arene complexes has often been compared to that of their Ru analogues, no definitive structure–activity relationship has yet been elucidated. In addition, the Os^II–arene complexes appear to have an altered pharmacological profile in comparison with the ruthenium complexes (Bruijnincx & Sadler, 2009 ). As part of our studies in this area, single-crystal X-ray diffraction was used to determine the structure of the title compound, (I).

2. Structural commentary

The molecular structure of (I) is shown in Fig. 1 and selected geometrical data are presented in Table 1. The complex adopts a `three-legged piano-stool' geometry, where the η⁶-coordinated arene ring is present as the seat, and the two O atoms of the tropolonate ligand along with the bromido ligand as the three legs of the stool.

Table 1
Selected bond lengths (Å)

Os1—C1A	2.090 (12)	Os1—C3B	2.167 (19)
Os1—C2A	2.125 (14)	Os1—C4B	2.192 (16)
Os1—C3A	2.158 (14)	Os1—C5B	2.21 (2)
Os1—C4A	2.157 (12)	Os1—C6B	2.21 (2)
Os1—C5A	2.123 (18)	Os1—O1	2.088 (6)
Os1—C6A	2.089 (18)	Os1—O2	2.071 (6)
Os1—C1B	2.187 (13)	Os1—Br1	2.5472 (12)
Os1—C2B	2.164 (17)

Figure 1
The molecular structure of (I)

showing 50% displacement ellipsoids. Only one orientation of the disordered benzene ring is shown.

The tropolonato anion is chelated to the metal centre, forming a five-membered OsO₂C₂ ring, which is almost planar, with the tight bite angle [76.3 (2)°] of the tropolonate chelate resulting in a distorted pseudo-octahedral coordination sphere. The rigid tropolonate ligand backbone is made up of an almost planar seven-membered ring consisting of conjugated sp² carbon atoms. The Os—O bond lengths [2.071 (6) and 2.088 (6) Å] are similar to those of the related ruthenium compound (ca 2.1 Å) published previously (Dwivedi et al., 2016 ). The isobidentate nature of the OsO₂C₂ moiety is evidence of delocalization of the C=O bonds of the tropolone ligand upon coordination [C11—O1 = 1.303 (11), C17—O2 = 1.299 (11)Å]. The aromatic ring of the p-cymene ligand appears almost planar, with the displacement of the arene ring centroid from the Os^II center [1.676 Å] being comparable with other similar complexes (Peacock et al., 2007 ; Kandioller et al. 2013 ).

3. Supramolecular features

In the crystal, the coordinated O atoms of the tropolonate ligand accept weak C—H⋯O interactions (Table 2) from the p-cymene ring in the range 2.40–2.72 Å, which contribute to the crystal packing. In addition, the bromide ion acts as a hydrogen-bond acceptor, forming C—H⋯Br hydrogen bonds with a C—H group from the arene ring of an adjacent molecule. There is also a π–π stacking interaction between the tropolone ligands with the plane-to-plane distances of the stacked aromatic ring moieties at 3.895 Å (Fig. 2).

Table 2
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C2A—H2A⋯O1ⁱ	0.95	2.40	3.24 (2)	148
C3B—H3B⋯O1ⁱ	0.95	2.75	3.38 (2)	124
C5B—H5B⋯O2ⁱⁱ	0.95	2.50	3.25 (2)	136
C6A—H6A⋯O2ⁱⁱ	0.95	2.71	3.39 (2)	124
C5A—H5A⋯O2ⁱⁱ	0.95	2.77	3.39 (2)	124
Symmetry codes: (i) -x, -y+2, -z; (ii) -x+1, -y+2, -z.

Figure 2
Detail of the packing of (I)

showing aromatic π–π stacking between the seven-membered rings as a blue dashed line.

4. Database survey

A search of the Cambridge Structural Database (Version 5.38, update February 2017; Groom et al., 2016 ) for related structures revealed that the isostructural ruthenium complex, [(η⁶-p-cymene)Ru(trop)Cl] (OTIMOV; Dwivedi et al., 2016), and similar osmium complexes (QEYXIC; Peacock et al., 2007 and BENYUQ; Kandioller et al., 2013) have been reported.

5. Synthesis and crystallization

All synthetic procedures were carried out using standard Schlenk techniques under an atmosphere of argon. The osmium dimer [Os(η⁶-p-cymene)Br₂]₂ (1.037 g, 1.07 mmol) and sodium tropolonate (0.448 g, 3.11 mmol) were suspended in methanol (100 ml). The suspension was stirred at room temperature overnight to give a dark-brown solution. The solution was filtered and the solvent was removed in vacuo. The residue was extracted with CH₂Cl₂ (80 ml). The solvent was removed under reduced pressure to give the title compound as a red–brown solid. Yield 72% (0.807 g, 1.54 mmol). Red blocks of (I) were obtained by slow evaporation from a concentrated dichloromethane solution at room temperature over several days.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 3. The C1–C10 atoms of the p-cymene ligand were modelled as disordered over two orientations with occupancies of 0.561 (15) and 0.439 (15).

Table 3
Experimental details

Crystal data
Chemical formula	C₁₇H₁₉BrO₂Os
M_r	525.43
Crystal system, space group	Monoclinic, P2₁/c
Temperature (K)	173
a, b, c (Å)	11.1574 (5), 14.6104 (7), 10.8342 (5)
β (°)	110.454 (2)
V (Å³)	1654.78 (13)
Z	4
Radiation type	Mo Kα
μ (mm⁻¹)	10.12
Crystal size (mm)	0.12 × 0.10 × 0.05

Data collection
Diffractometer	Bruker D8 Venture Photon CCD area detector
Absorption correction	Integration (XPREP; Bruker, 2016 )
T_min, T_max	0.538, 0.714
No. of measured, independent and observed [I > 2σ(I)] reflections	58616, 3990, 3614
R_int	0.079
(sin θ/λ)_max (Å⁻¹)	0.660

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.053, 0.118, 1.15
No. of reflections	3990
No. of parameters	259
No. of restraints	384
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	5.63, −2.07
Computer programs: APEX3, SAINT-Plus and XPREP (Bruker, 2016), SHELXS97 (Sheldrick, 2008 ) and SHELXL2014/7 (Sheldrick, 2015 ), ORTEP for Windows and WinGX publication routines (Farrugia, 2012 ).

Supporting information

CCDC reference: 1818437

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S2056989018001391/hb7721sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989018001391/hb7721Isup2.hkl

checkCIF report

Computing details top

Data collection: APEX3 (Bruker, 2016); cell refinement: SAINT-Plus (Bruker, 2016); data reduction: SAINT-Plus and XPREP (Bruker, 2016); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL2014/7 (Sheldrick, 2015); molecular graphics: ORTEP for Windows (Farrugia, 2012); software used to prepare material for publication: WinGX publication routines (Farrugia, 2012).

Bromido(η⁶-1-isopropyl-4-methylbenzene)(7-oxocyclohepta-1,3,5-trien-\ 1-olato-κ²O,O')osmium top

Crystal data top

C₁₇H₁₉BrO₂Os	F(000) = 992
M_r = 525.43	D_x = 2.109 Mg m⁻³
Monoclinic, P2₁/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 2ybc	Cell parameters from 9941 reflections
a = 11.1574 (5) Å	θ = 3.3–28.3°
b = 14.6104 (7) Å	µ = 10.12 mm⁻¹
c = 10.8342 (5) Å	T = 173 K
β = 110.454 (2)°	Block, red
V = 1654.78 (13) Å³	0.12 × 0.10 × 0.05 mm
Z = 4

Data collection top

Bruker D8 Venture Photon CCD area detector diffractometer	3614 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.079
ω scans	θ_max = 28.0°, θ_min = 3.4°
Absorption correction: integration Bruker XPREP (Bruker, 2016)	h = −14→14
T_min = 0.538, T_max = 0.714	k = −19→19
58616 measured reflections	l = −14→14
3990 independent reflections

Refinement top

Refinement on F²	0 constraints
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.053	H-atom parameters constrained
wR(F²) = 0.118	w = 1/[σ²(F_o²) + (0.0137P)² + 44.2634P] where P = (F_o² + 2F_c²)/3
S = 1.15	(Δ/σ)_max < 0.001
3990 reflections	Δρ_max = 5.63 e Å⁻³
259 parameters	Δρ_min = −2.07 e Å⁻³
384 restraints

Special details top

Experimental. Numerical integration absorption corrections based on indexed crystal faces were applied using the XPREP routine (Bruker, 2016)

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)
C1A	0.2170 (16)	1.0600 (9)	−0.1234 (11)	0.035 (3)	0.561 (15)
C2A	0.1066 (14)	1.0131 (11)	−0.1297 (16)	0.034 (3)	0.561 (15)
H2A	0.0364	1.0455	−0.1202	0.041*	0.561 (15)
C3A	0.0988 (13)	0.9190 (11)	−0.1497 (16)	0.036 (3)	0.561 (15)
H3A	0.0234	0.887	−0.154	0.043*	0.561 (15)
C4A	0.2015 (16)	0.8718 (9)	−0.1635 (12)	0.035 (3)	0.561 (15)
C5A	0.3120 (14)	0.9186 (13)	−0.1572 (19)	0.034 (3)	0.561 (15)
H5A	0.3822	0.8863	−0.1666	0.041*	0.561 (15)
C6A	0.3197 (13)	1.0127 (13)	−0.1372 (19)	0.033 (3)	0.561 (15)
H6A	0.3951	1.0447	−0.1329	0.039*	0.561 (15)
C7A	0.2286 (19)	1.1633 (10)	−0.1010 (16)	0.040 (3)	0.561 (15)
H7A	0.3211	1.1768	−0.0529	0.048*	0.561 (15)
C8A	0.155 (2)	1.1965 (17)	−0.013 (2)	0.050 (5)	0.561 (15)
H8A1	0.1833	1.1617	0.0691	0.076*	0.561 (15)
H8A2	0.1726	1.2617	0.0059	0.076*	0.561 (15)
H8A3	0.0635	1.1873	−0.0592	0.076*	0.561 (15)
C9A	0.190 (2)	1.2146 (16)	−0.2316 (19)	0.048 (5)	0.561 (15)
H9A1	0.1982	1.2806	−0.2148	0.073*	0.561 (15)
H9A2	0.246	1.1962	−0.2797	0.073*	0.561 (15)
H9A3	0.1011	1.1999	−0.2844	0.073*	0.561 (15)
C10A	0.193 (2)	0.7683 (12)	−0.1851 (17)	0.046 (4)	0.561 (15)
H10A	0.144	0.7411	−0.1345	0.068*	0.561 (15)
H10B	0.2789	0.742	−0.1558	0.068*	0.561 (15)
H10C	0.1493	0.7552	−0.279	0.068*	0.561 (15)
C1B	0.175 (2)	0.8944 (11)	−0.1821 (12)	0.033 (3)	0.439 (15)
C2B	0.0910 (16)	0.9528 (13)	−0.1515 (19)	0.028 (3)	0.439 (15)
H2B	0.0097	0.931	−0.1548	0.034*	0.439 (15)
C3B	0.1259 (18)	1.0430 (12)	−0.116 (2)	0.031 (4)	0.439 (15)
H3B	0.0684	1.0829	−0.0953	0.037*	0.439 (15)
C4B	0.2448 (19)	1.0749 (12)	−0.1114 (16)	0.031 (3)	0.439 (15)
C5B	0.3288 (16)	1.0166 (17)	−0.142 (2)	0.028 (3)	0.439 (15)
H5B	0.4101	1.0384	−0.1387	0.033*	0.439 (15)
C6B	0.2939 (19)	0.9263 (15)	−0.177 (2)	0.031 (3)	0.439 (15)
H6B	0.3514	0.8865	−0.1982	0.037*	0.439 (15)
C7B	0.140 (2)	0.7948 (13)	−0.2213 (16)	0.042 (4)	0.439 (15)
H7B	0.2226	0.7599	−0.1945	0.05*	0.439 (15)
C8B	0.054 (3)	0.7458 (19)	−0.160 (3)	0.049 (6)	0.439 (15)
H8B1	0.0927	0.7492	−0.0633	0.073*	0.439 (15)
H8B2	−0.03	0.7752	−0.1885	0.073*	0.439 (15)
H8B3	0.0447	0.6815	−0.1871	0.073*	0.439 (15)
C9B	0.084 (3)	0.791 (2)	−0.3714 (18)	0.047 (6)	0.439 (15)
H9B1	0.1405	0.8228	−0.4086	0.07*	0.439 (15)
H9B2	0.0743	0.727	−0.4003	0.07*	0.439 (15)
H9B3	−0.0004	0.8207	−0.4018	0.07*	0.439 (15)
C10B	0.280 (3)	1.1744 (14)	−0.072 (2)	0.040 (5)	0.439 (15)
H10D	0.2606	1.2121	−0.1511	0.06*	0.439 (15)
H10E	0.3709	1.1786	−0.0195	0.06*	0.439 (15)
H10F	0.2294	1.1963	−0.0193	0.06*	0.439 (15)
C11	0.2519 (8)	0.9918 (7)	0.2698 (9)	0.0254 (18)
C12	0.2049 (9)	0.9871 (8)	0.3746 (10)	0.033 (2)
H12	0.1296	0.9515	0.3575	0.04*
C13	0.2518 (10)	1.0265 (8)	0.4988 (10)	0.037 (2)
H13	0.2066	1.0116	0.5559	0.045*
C14	0.3564 (11)	1.0851 (9)	0.5517 (11)	0.045 (3)
H14	0.3716	1.1058	0.639	0.054*
C15	0.4393 (10)	1.1163 (8)	0.4942 (10)	0.038 (2)
H15	0.5031	1.1574	0.5459	0.045*
C16	0.4436 (9)	1.0967 (7)	0.3722 (10)	0.032 (2)
H16	0.5106	1.1266	0.3528	0.038*
C17	0.3659 (8)	1.0398 (7)	0.2702 (9)	0.0256 (18)
O1	0.1888 (6)	0.9495 (5)	0.1605 (6)	0.0312 (15)
O2	0.3948 (6)	1.0300 (5)	0.1647 (6)	0.0287 (14)
Br1	0.40095 (10)	0.81751 (8)	0.13655 (12)	0.0417 (3)
Os1	0.26979 (3)	0.95325 (3)	0.01352 (3)	0.02377 (12)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1A	0.019 (6)	0.056 (6)	0.031 (6)	0.004 (5)	0.011 (5)	0.007 (5)
C2A	0.018 (6)	0.061 (7)	0.022 (6)	−0.002 (6)	0.005 (5)	0.006 (7)
C3A	0.019 (5)	0.064 (8)	0.024 (6)	−0.007 (6)	0.007 (5)	0.001 (7)
C4A	0.028 (6)	0.060 (7)	0.015 (6)	−0.003 (5)	0.007 (5)	0.000 (6)
C5A	0.021 (5)	0.059 (6)	0.022 (7)	0.002 (5)	0.008 (6)	−0.001 (6)
C6A	0.025 (5)	0.056 (5)	0.022 (6)	0.002 (5)	0.016 (5)	0.008 (6)
C7A	0.029 (9)	0.055 (6)	0.048 (8)	0.000 (6)	0.026 (7)	0.012 (7)
C8A	0.058 (12)	0.059 (11)	0.047 (10)	−0.001 (10)	0.034 (9)	−0.001 (9)
C9A	0.052 (11)	0.056 (10)	0.046 (9)	0.012 (10)	0.028 (9)	0.011 (8)
C10A	0.038 (10)	0.065 (7)	0.032 (9)	−0.009 (7)	0.010 (8)	−0.012 (9)
C1B	0.022 (7)	0.056 (7)	0.017 (7)	−0.003 (5)	0.002 (6)	−0.001 (6)
C2B	0.022 (6)	0.051 (8)	0.017 (6)	−0.005 (6)	0.013 (5)	0.013 (7)
C3B	0.016 (6)	0.056 (8)	0.022 (7)	0.002 (6)	0.009 (6)	0.000 (7)
C4B	0.022 (7)	0.048 (6)	0.028 (7)	−0.002 (5)	0.015 (6)	0.008 (6)
C5B	0.021 (6)	0.049 (6)	0.021 (7)	0.001 (5)	0.017 (6)	0.014 (6)
C6B	0.027 (6)	0.056 (6)	0.013 (7)	0.000 (5)	0.012 (6)	0.001 (6)
C7B	0.029 (9)	0.059 (8)	0.030 (8)	−0.004 (7)	0.003 (7)	−0.006 (8)
C8B	0.055 (14)	0.050 (12)	0.044 (11)	−0.010 (10)	0.020 (11)	−0.009 (11)
C9B	0.050 (14)	0.058 (14)	0.030 (8)	0.005 (11)	0.013 (9)	−0.013 (8)
C10B	0.030 (11)	0.051 (8)	0.047 (12)	−0.002 (8)	0.023 (10)	0.000 (9)
C11	0.017 (4)	0.038 (5)	0.023 (4)	0.007 (4)	0.009 (3)	0.004 (4)
C12	0.024 (4)	0.050 (6)	0.028 (5)	0.001 (4)	0.012 (4)	0.004 (4)
C13	0.033 (5)	0.060 (7)	0.025 (5)	0.005 (5)	0.018 (4)	0.000 (4)
C14	0.046 (6)	0.057 (7)	0.025 (5)	0.018 (6)	0.002 (5)	−0.006 (5)
C15	0.037 (5)	0.043 (6)	0.028 (5)	0.003 (5)	0.005 (4)	−0.006 (4)
C16	0.028 (5)	0.038 (6)	0.029 (5)	0.001 (4)	0.010 (4)	−0.004 (4)
C17	0.020 (4)	0.033 (5)	0.025 (4)	0.004 (4)	0.009 (3)	0.000 (4)
O1	0.019 (3)	0.053 (4)	0.024 (3)	−0.005 (3)	0.010 (3)	−0.006 (3)
O2	0.020 (3)	0.046 (4)	0.026 (3)	−0.006 (3)	0.016 (3)	−0.004 (3)
Br1	0.0316 (5)	0.0392 (6)	0.0526 (7)	0.0059 (4)	0.0128 (5)	0.0038 (5)
Os1	0.01538 (16)	0.0385 (2)	0.02000 (17)	0.00078 (14)	0.00944 (12)	−0.00243 (15)

Geometric parameters (Å, º) top

Os1—C1A	2.090 (12)	C1B—C2B	1.39
Os1—C2A	2.125 (14)	C1B—C6B	1.39
Os1—C3A	2.158 (14)	C1B—C7B	1.528 (10)
Os1—C4A	2.157 (12)	C2B—C3B	1.39
Os1—C5A	2.123 (18)	C2B—H2B	0.95
Os1—C6A	2.089 (18)	C3B—C4B	1.39
Os1—C1B	2.187 (13)	C3B—H3B	0.95
Os1—C2B	2.164 (17)	C4B—C5B	1.39
Os1—C3B	2.167 (19)	C4B—C10B	1.526 (10)
Os1—C4B	2.192 (16)	C5B—C6B	1.39
Os1—C5B	2.21 (2)	C5B—H5B	0.95
Os1—C6B	2.21 (2)	C6B—H6B	0.95
Os1—O1	2.088 (6)	C7B—C9B	1.527 (11)
Os1—O2	2.071 (6)	C7B—C8B	1.527 (11)
Os1—Br1	2.5472 (12)	C7B—H7B	1
C1A—C2A	1.39	C8B—H8B1	0.98
C1A—C6A	1.39	C8B—H8B2	0.98
C1A—C7A	1.528 (10)	C8B—H8B3	0.98
C2A—C3A	1.39	C9B—H9B1	0.98
C2A—H2A	0.95	C9B—H9B2	0.98
C3A—C4A	1.39	C9B—H9B3	0.98
C3A—H3A	0.95	C10B—H10D	0.98
C4A—C5A	1.39	C10B—H10E	0.98
C4A—C10A	1.528 (10)	C10B—H10F	0.98
C5A—C6A	1.39	C11—O1	1.303 (11)
C5A—H5A	0.95	C11—C12	1.408 (13)
C6A—H6A	0.95	C11—C17	1.452 (13)
C7A—C9A	1.524 (10)	C12—C13	1.388 (14)
C7A—C8A	1.531 (10)	C12—H12	0.95
C7A—H7A	1	C13—C14	1.399 (17)
C8A—H8A1	0.98	C13—H13	0.95
C8A—H8A2	0.98	C14—C15	1.362 (17)
C8A—H8A3	0.98	C14—H14	0.95
C9A—H9A1	0.98	C15—C16	1.369 (14)
C9A—H9A2	0.98	C15—H15	0.95
C9A—H9A3	0.98	C16—C17	1.413 (13)
C10A—H10A	0.98	C16—H16	0.95
C10A—H10B	0.98	C17—O2	1.299 (11)
C10A—H10C	0.98

C2A—C1A—C6A	120	C5B—C6B—H6B	120
C2A—C1A—C7A	121.3 (12)	C1B—C6B—H6B	120
C6A—C1A—C7A	118.7 (12)	Os1—C6B—H6B	130.1
C2A—C1A—Os1	72.1 (6)	C9B—C7B—C8B	111 (2)
C6A—C1A—Os1	70.5 (6)	C9B—C7B—C1B	107.5 (14)
C7A—C1A—Os1	129.6 (4)	C8B—C7B—C1B	117.5 (19)
C1A—C2A—C3A	120	C9B—C7B—H7B	106.7
C1A—C2A—Os1	69.4 (6)	C8B—C7B—H7B	106.7
C3A—C2A—Os1	72.4 (4)	C1B—C7B—H7B	106.7
C1A—C2A—H2A	120	C7B—C8B—H8B1	109.5
C3A—C2A—H2A	120	C7B—C8B—H8B2	109.5
Os1—C2A—H2A	130.9	H8B1—C8B—H8B2	109.5
C2A—C3A—C4A	120	C7B—C8B—H8B3	109.5
C2A—C3A—Os1	69.8 (4)	H8B1—C8B—H8B3	109.5
C4A—C3A—Os1	71.2 (5)	H8B2—C8B—H8B3	109.5
C2A—C3A—H3A	120	C7B—C9B—H9B1	109.5
C4A—C3A—H3A	120	C7B—C9B—H9B2	109.5
Os1—C3A—H3A	131.9	H9B1—C9B—H9B2	109.5
C5A—C4A—C3A	120	C7B—C9B—H9B3	109.5
C5A—C4A—C10A	120.2 (13)	H9B1—C9B—H9B3	109.5
C3A—C4A—C10A	119.8 (13)	H9B2—C9B—H9B3	109.5
C5A—C4A—Os1	69.7 (6)	C4B—C10B—H10D	109.5
C3A—C4A—Os1	71.2 (6)	C4B—C10B—H10E	109.5
C10A—C4A—Os1	131.8 (4)	H10D—C10B—H10E	109.5
C6A—C5A—C4A	120	C4B—C10B—H10F	109.5
C6A—C5A—Os1	69.4 (4)	H10D—C10B—H10F	109.5
C4A—C5A—Os1	72.4 (5)	H10E—C10B—H10F	109.5
C6A—C5A—H5A	120	O1—C11—C12	118.3 (9)
C4A—C5A—H5A	120	O1—C11—C17	115.2 (8)
Os1—C5A—H5A	130.9	C12—C11—C17	126.4 (9)
C5A—C6A—C1A	120	C13—C12—C11	129.9 (10)
C5A—C6A—Os1	72.1 (4)	C13—C12—H12	115.1
C1A—C6A—Os1	70.6 (5)	C11—C12—H12	115.1
C5A—C6A—H6A	120	C12—C13—C14	129.0 (10)
C1A—C6A—H6A	120	C12—C13—H13	115.5
Os1—C6A—H6A	129.8	C14—C13—H13	115.5
C9A—C7A—C1A	110.9 (12)	C15—C14—C13	128.3 (10)
C9A—C7A—C8A	112.4 (16)	C15—C14—H14	115.8
C1A—C7A—C8A	112.2 (15)	C13—C14—H14	115.8
C9A—C7A—H7A	107	C14—C15—C16	129.1 (11)
C1A—C7A—H7A	107	C14—C15—H15	115.5
C8A—C7A—H7A	107	C16—C15—H15	115.5
C7A—C8A—H8A1	109.5	C15—C16—C17	131.2 (10)
C7A—C8A—H8A2	109.5	C15—C16—H16	114.4
H8A1—C8A—H8A2	109.5	C17—C16—H16	114.4
C7A—C8A—H8A3	109.5	O2—C17—C16	118.7 (8)
H8A1—C8A—H8A3	109.5	O2—C17—C11	115.5 (8)
H8A2—C8A—H8A3	109.5	C16—C17—C11	125.8 (9)
C7A—C9A—H9A1	109.5	C11—O1—Os1	116.1 (6)
C7A—C9A—H9A2	109.5	C17—O2—Os1	116.7 (6)
H9A1—C9A—H9A2	109.5	O2—Os1—O1	76.3 (2)
C7A—C9A—H9A3	109.5	O2—Os1—C6A	95.9 (5)
H9A1—C9A—H9A3	109.5	O1—Os1—C6A	155.7 (6)
H9A2—C9A—H9A3	109.5	O2—Os1—C1A	95.9 (4)
C4A—C10A—H10A	109.5	O1—Os1—C1A	118.1 (5)
C4A—C10A—H10B	109.5	C6A—Os1—C1A	38.9 (3)
H10A—C10A—H10B	109.5	O2—Os1—C5A	121.7 (5)
C4A—C10A—H10C	109.5	O1—Os1—C5A	160.9 (6)
H10A—C10A—H10C	109.5	C6A—Os1—C5A	38.5 (3)
H10B—C10A—H10C	109.5	C1A—Os1—C5A	69.7 (4)
C2B—C1B—C6B	120	O2—Os1—C2A	121.5 (5)
C2B—C1B—C7B	121.6 (16)	O1—Os1—C2A	94.5 (5)
C6B—C1B—C7B	118.4 (16)	C6A—Os1—C2A	69.7 (3)
C2B—C1B—Os1	70.5 (7)	C1A—Os1—C2A	38.5 (2)
C6B—C1B—Os1	72.5 (8)	C5A—Os1—C2A	81.8 (3)
C7B—C1B—Os1	129.3 (5)	O2—Os1—C4A	158.9 (5)
C1B—C2B—C3B	120	O1—Os1—C4A	123.4 (5)
C1B—C2B—Os1	72.2 (7)	C6A—Os1—C4A	69.0 (4)
C3B—C2B—Os1	71.4 (5)	C1A—Os1—C4A	81.7 (3)
C1B—C2B—H2B	120	C5A—Os1—C4A	37.9 (2)
C3B—C2B—H2B	120	C2A—Os1—C4A	68.4 (3)
Os1—C2B—H2B	128.6	O2—Os1—C3A	158.7 (5)
C4B—C3B—C2B	120	O1—Os1—C3A	97.2 (5)
C4B—C3B—Os1	72.4 (7)	C6A—Os1—C3A	81.7 (3)
C2B—C3B—Os1	71.2 (5)	C1A—Os1—C3A	69.0 (3)
C4B—C3B—H3B	120	C5A—Os1—C3A	68.4 (3)
C2B—C3B—H3B	120	C2A—Os1—C3A	37.9 (2)
Os1—C3B—H3B	128.7	C4A—Os1—C3A	37.6 (2)
C3B—C4B—C5B	120	O2—Os1—C2B	145.8 (6)
C3B—C4B—C10B	118.4 (16)	O1—Os1—C2B	96.3 (5)
C5B—C4B—C10B	121.6 (16)	O2—Os1—C3B	109.1 (5)
C3B—C4B—Os1	70.4 (7)	O1—Os1—C3B	95.2 (6)
C5B—C4B—Os1	72.5 (8)	C2B—Os1—C3B	37.4 (3)
C10B—C4B—Os1	129.3 (5)	O2—Os1—C1B	160.6 (6)
C6B—C5B—C4B	120	O1—Os1—C1B	122.5 (6)
C6B—C5B—Os1	71.6 (5)	C2B—Os1—C1B	37.3 (2)
C4B—C5B—Os1	70.7 (6)	C3B—Os1—C1B	67.1 (4)
C6B—C5B—H5B	120	O2—Os1—C4B	87.4 (4)
C4B—C5B—H5B	120	O1—Os1—C4B	119.8 (6)
Os1—C5B—H5B	130.2	C2B—Os1—C4B	67.1 (4)
C5B—C6B—C1B	120	C3B—Os1—C4B	37.2 (3)
C5B—C6B—Os1	71.8 (5)	C1B—Os1—C4B	78.8 (4)
C1B—C6B—Os1	70.6 (6)

C6A—C1A—C2A—C3A	0	C2B—C3B—C4B—C5B	0
C7A—C1A—C2A—C3A	−179.8 (3)	Os1—C3B—C4B—C5B	55.0 (5)
Os1—C1A—C2A—C3A	−53.8 (5)	C2B—C3B—C4B—C10B	−179.9 (3)
C6A—C1A—C2A—Os1	53.8 (5)	Os1—C3B—C4B—C10B	−124.9 (6)
C7A—C1A—C2A—Os1	−126.0 (5)	C2B—C3B—C4B—Os1	−55.0 (5)
C1A—C2A—C3A—C4A	0	C3B—C4B—C5B—C6B	0
Os1—C2A—C3A—C4A	−52.4 (6)	C10B—C4B—C5B—C6B	179.8 (3)
C1A—C2A—C3A—Os1	52.4 (6)	Os1—C4B—C5B—C6B	54.0 (5)
C2A—C3A—C4A—C5A	0	C3B—C4B—C5B—Os1	−54.0 (5)
Os1—C3A—C4A—C5A	−51.8 (5)	C10B—C4B—C5B—Os1	125.9 (5)
C2A—C3A—C4A—C10A	179.8 (3)	C4B—C5B—C6B—C1B	0
Os1—C3A—C4A—C10A	128.1 (5)	Os1—C5B—C6B—C1B	53.6 (7)
C2A—C3A—C4A—Os1	51.8 (5)	C4B—C5B—C6B—Os1	−53.6 (7)
C3A—C4A—C5A—C6A	0	C2B—C1B—C6B—C5B	0
C10A—C4A—C5A—C6A	−179.8 (3)	C7B—C1B—C6B—C5B	−180.0 (3)
Os1—C4A—C5A—C6A	−52.5 (4)	Os1—C1B—C6B—C5B	−54.2 (5)
C3A—C4A—C5A—Os1	52.5 (4)	C2B—C1B—C6B—Os1	54.2 (5)
C10A—C4A—C5A—Os1	−127.4 (5)	C7B—C1B—C6B—Os1	−125.8 (6)
C4A—C5A—C6A—C1A	0	C2B—C1B—C7B—C9B	93.9 (19)
Os1—C5A—C6A—C1A	−53.8 (5)	C6B—C1B—C7B—C9B	−86.1 (19)
C4A—C5A—C6A—Os1	53.8 (5)	Os1—C1B—C7B—C9B	−176.3 (18)
C2A—C1A—C6A—C5A	0	C2B—C1B—C7B—C8B	−32 (2)
C7A—C1A—C6A—C5A	179.8 (3)	C6B—C1B—C7B—C8B	148 (2)
Os1—C1A—C6A—C5A	54.5 (4)	Os1—C1B—C7B—C8B	58 (3)
C2A—C1A—C6A—Os1	−54.5 (4)	O1—C11—C12—C13	−178.9 (11)
C7A—C1A—C6A—Os1	125.3 (5)	C17—C11—C12—C13	1.2 (18)
C2A—C1A—C7A—C9A	−93.8 (15)	C11—C12—C13—C14	3 (2)
C6A—C1A—C7A—C9A	86.4 (16)	C12—C13—C14—C15	−1 (2)
Os1—C1A—C7A—C9A	174.1 (14)	C13—C14—C15—C16	−2 (2)
C2A—C1A—C7A—C8A	32.8 (16)	C14—C15—C16—C17	0 (2)
C6A—C1A—C7A—C8A	−147.0 (15)	C15—C16—C17—O2	−176.9 (11)
Os1—C1A—C7A—C8A	−59 (2)	C15—C16—C17—C11	4.9 (18)
C6B—C1B—C2B—C3B	0	O1—C11—C17—O2	−4.0 (12)
C7B—C1B—C2B—C3B	180.0 (3)	C12—C11—C17—O2	176.0 (9)
Os1—C1B—C2B—C3B	55.1 (6)	O1—C11—C17—C16	174.3 (9)
C6B—C1B—C2B—Os1	−55.1 (6)	C12—C11—C17—C16	−5.8 (16)
C7B—C1B—C2B—Os1	124.8 (6)	C12—C11—O1—Os1	−176.6 (7)
C1B—C2B—C3B—C4B	0	C17—C11—O1—Os1	3.4 (10)
Os1—C2B—C3B—C4B	55.5 (8)	C16—C17—O2—Os1	−175.7 (7)
C1B—C2B—C3B—Os1	−55.5 (8)	C11—C17—O2—Os1	2.6 (10)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
C2A—H2A···O1ⁱ	0.95	2.40	3.24 (2)	148
C3B—H3B···O1ⁱ	0.95	2.75	3.38 (2)	124
C5B—H5B···O2ⁱⁱ	0.95	2.50	3.25 (2)	136
C6A—H6A···O2ⁱⁱ	0.95	2.71	3.39 (2)	124
C5A—H5A···O2ⁱⁱ	0.95	2.77	3.39 (2)	124

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

Acknowledgements

We gratefully acknowledge Anglo American Technical Solutions: Research for generous donations of potassium osmate. We would like to thank the Molecular Sciences Institute at the University of the Witwatersrand for infrastructure support. The National Research Foundation National Equipment Programme (UID: 78572) is thanked for financing the purchase of the single crystal diffractometer.

Funding information

This work is based on the research supported in part by the National Research Foundation of South Africa, Grant Nos. 99234 and 96345.

References

Bruijnincx, P. C. A. & Sadler, P. J. (2009). Adv. Inorg. Chem. 61, 1–62. Web of Science CrossRef CAS PubMed Google Scholar
Bruker (2016). APEX2, SAINT and SADABS. BrukerAXS Inc, Madison, Wisconsin, USA. Google Scholar
Dwivedi, A. D., Binnani, C., Tyagi, D., Rawat, K. S., Li, P.-Z., Zhao, Y., Mobin, S. M., Pathak, B. & Singh, S. K. (2016). Inorg. Chem. 55, 6739–6749. Web of Science CSD CrossRef CAS PubMed Google Scholar
Farrugia, L. J. (2012). J. Appl. Cryst. 45, 849–854. Web of Science CrossRef CAS IUCr Journals Google Scholar
Groom, C. R., Bruno, I. J., Lightfoot, M. P. & Ward, S. C. (2016). Acta Cryst. B72, 171–179. Web of Science CSD CrossRef IUCr Journals Google Scholar
Hanif, M., Babak, M. V. & Hartinger, C. G. (2014). Drug Discov. Today, 19, 1640–1648. Web of Science CrossRef CAS PubMed Google Scholar
Hanif, M., Henke, H., Meier, S. M., Martic, S., Labib, M., Kandioller, W., Jakupec, M. A., Arion, V. B., Kraatz, H.-B., Keppler, B. K. & Hartinger, C. G. (2010). Inorg. Chem. 49, 7953–7963. Web of Science CSD CrossRef CAS PubMed Google Scholar
Kandioller, W., Balsano, E., Meier, S. M., Jungwirth, U., Göschl, S., Roller, A., Jakupec, M. A., Berger, W., Keppler, B. K. & Hartinger, C. G. (2013). Chem. Commun. 49, 3348–3350. Web of Science CSD CrossRef CAS Google Scholar
Peacock, A. F. A., Melchart, M., Deeth, R. J., Habtemariam, A., Parsons, S. & Sadler, P. J. (2007). Chem. Eur. J. 13, 2601–2613. Web of Science CSD CrossRef PubMed CAS Google Scholar
Rijt, S. H. van, Peacock, A. F., Johnstone, R. D., Parsons, S. & Sadler, P. J. (2009). Inorg. Chem. 48, 1753–1762. Web of Science PubMed Google Scholar
Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
Sheldrick, G. M. (2015). Acta Cryst. C71, 3–8. Web of Science CrossRef IUCr Journals Google Scholar
Zhang, P. & Sadler, P. J. (2017). J. Organomet. Chem. 839, 5–14. Web of Science CrossRef CAS Google Scholar

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