metal-organic compounds
cis-Dichloridotetrakis(trimethylphosphane-κP)ruthenium(II) benzene disolvate
aDepartment of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People's Republic of China
*Correspondence e-mail: chwtb@xmu.edu.cn
The title compound, cis-[RuCl2(C3H9P)4]·2C6H6, contains a complex molecule with a crystallographic mirror plane passing through the RuII atom, the two cis-disposed Cl ligands and two P atoms of the two cis-disposed P(CH3)3 ligands. The RuII atom adopts a distorted octahedral RuCl2P4 coordination geometry with the two trans-disposed P atoms occupying the axial positions. The packing of the structure is accomplished through non-classical C—H⋯Cl hydrogen bonds between the benzene solvent molecule and one of the Cl ligands.
Related literature
For general background to trans-[RuCl2(P(CH3)3)4], see: Csok et al. (2007); Gotzig et al. (1985); Hartwig et al. (1991); Hirano et al. (2010); Kohlmann & Werner (1993). For a related structure, see: Joo et al. (1994).
Experimental
Crystal data
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Refinement
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Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supporting information
https://doi.org/10.1107/S1600536810049706/wm2431sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810049706/wm2431Isup2.hkl
Route A: To a solution of RuCl2(PPh3)3 (0.25 g, 0.24 mmol) in toluene (8 ml) under nitrogen atmosphere was added PMe3 (0.27 ml, 2.5 mmol) and the resulting yellow solution was refluxed for 20 h. The solvent was removed under vacuum, and the solid residue was washed with n-hexane, and dried under vacuum to afford a white solid. Yield: 90 mg, 80%. Route B: A solution of trans-[RuCl2(PMe3)4] (100 mg, 0.21 mmol) in benzene (5 ml) was refluxed for 12 h under nitrogen atmosphere. After the solution was cooled to ambient temperature, a white solid was precipitated, which was collected by filtration, washed with n-hexane, and dried under vacuum. Yield: 72 mg, 72%. Crystals suitable for X-ray analysis were obtained from standing a solution of trans-[RuCl2(PMe3)4] in benzene at room temperature for 2 weeks.
The benzene solvent molecule was treated as a rigid body. All non-hydrogen atoms were refined anisotropically. The hydrogen atoms were positioned geometrically (C—H = 0.96 or 0.93 Å for methyl or phenyl H atoms, respectively) and were included in the
in the riding model approximation. The displacement parameters of methyl H atoms were set to 1.5Ueq(C), while those of the phenyl H atoms were set to 1.2Ueq(C). In the final Fourier map the highest peak is 0.04 Å from atom Ru1 and the deepest hole is 0.71 Å from atom Ru1.The ruthenium(II) complex trans-[RuCl2(PMe3)4], which can be readily prepared from the reaction of RuCl2(PPh3)3 with PMe3 in hexane at room temperature (Gotzig et al., 1985), has proved to be a useful precursor for a wide variety of ruthenium compounds (Hartwig et al., 1991; Kohlmann & Werner, 1993; Csok et al., 2007; Hirano et al., 2010). However, its geometrical isomer, cis-[RuCl2(PMe3)4], has not been reported yet. During our preparation of ruthenium compounds with phosphine ligands using trans-[RuCl2(PMe3)4] as the starting material, we found that the trans-isomer slowly isomerizes to the cis-isomer, the structure of which we report here as the benzene disolvate.
As shown in Fig.1, the structure of the title complex possesses a crystallographic mirror plane passing through the RuII atom, the two cis-disposed Cl ligands and the two P atoms as well as two C atoms of the two cis-disposed PMe3 ligands. Thus the κP); 2.488 (2) and 2.503 (2) Å, 84.2 (1) °; Joo et al., 1994).
of the structure contains half of a molecule. The RuII atom adopts a distorted octahedral geometry with the two trans-disposed P atoms occupying the axial positions. The bond lengths of the two axial Ru—P bonds (2.3819 (14) Å), which are actually image-related, are slightly longer than those of the two equatorial Ru—P bonds which are trans to the Cl ligands (2.2690 (19) and 2.297 (2) Å, respectively). The two Ru—Cl bond lengths are 2.479 (2) and 2.5038 (19) Å, respectively, while the Cl(1)—Ru(1)—Cl(2) bond angle is 86.20 (7)°. These geometric values are similar to those reported for the only example of a sructurally characterized monodentate tetrakis(phosphine)-cis-dichlorido-ruthenium(II) complex, viz. [cis-RuCl2(PTA)4] (PTA = 1,3,5-triaza-7-phospha-adamantane-The packing of the structure (Fig. 2) is accomplished through non-classical C—H···Cl hydrogen bonds between the benzene solvent molecule and one of the Cl ligands (Table 2).
For general background to trans-[RuCl2(P(CH3)3)4], see: Csok et al. (2007); Gotzig et al. (1985); Hartwig et al. (1991); Hirano et al. (2010); Kohlmann & Werner (1993). For a related structure, see: Joo et al. (1994).
Data collection: CrysAlis CCD (Oxford Diffraction, 2008); cell
CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED (Oxford Diffraction, 2008); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).[RuCl2(C3H9P)4]·2C6H6 | F(000) = 1320 |
Mr = 632.47 | Dx = 1.385 Mg m−3 |
Orthorhombic, Pnma | Mo Kα radiation, λ = 0.7107 Å |
Hall symbol: -P 2ac 2n | Cell parameters from 1376 reflections |
a = 17.6243 (15) Å | θ = 2.3–28.9° |
b = 18.1889 (19) Å | µ = 0.92 mm−1 |
c = 9.4610 (11) Å | T = 173 K |
V = 3032.9 (5) Å3 | Block, colorless |
Z = 4 | 0.18 × 0.12 × 0.06 mm |
Oxford Diffraction Gemini S Ultra diffractometer | 3550 independent reflections |
Radiation source: Enhance (Mo) X-ray Source | 1653 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.148 |
Detector resolution: 16.1930 pixels mm-1 | θmax = 27.5°, θmin = 2.3° |
ω scans | h = −22→21 |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2008) | k = −23→22 |
Tmin = 0.949, Tmax = 1.000 | l = −10→12 |
14352 measured reflections |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.058 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.081 | H-atom parameters constrained |
S = 0.82 | w = 1/[σ2(Fo2) + (0.0104P)2] where P = (Fo2 + 2Fc2)/3 |
3550 reflections | (Δ/σ)max = 0.003 |
139 parameters | Δρmax = 0.97 e Å−3 |
0 restraints | Δρmin = −0.57 e Å−3 |
[RuCl2(C3H9P)4]·2C6H6 | V = 3032.9 (5) Å3 |
Mr = 632.47 | Z = 4 |
Orthorhombic, Pnma | Mo Kα radiation |
a = 17.6243 (15) Å | µ = 0.92 mm−1 |
b = 18.1889 (19) Å | T = 173 K |
c = 9.4610 (11) Å | 0.18 × 0.12 × 0.06 mm |
Oxford Diffraction Gemini S Ultra diffractometer | 3550 independent reflections |
Absorption correction: multi-scan (CrysAlis RED; Oxford Diffraction, 2008) | 1653 reflections with I > 2σ(I) |
Tmin = 0.949, Tmax = 1.000 | Rint = 0.148 |
14352 measured reflections |
R[F2 > 2σ(F2)] = 0.058 | 0 restraints |
wR(F2) = 0.081 | H-atom parameters constrained |
S = 0.82 | Δρmax = 0.97 e Å−3 |
3550 reflections | Δρmin = −0.57 e Å−3 |
139 parameters |
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. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
Ru1 | 0.54358 (3) | 0.2500 | 0.30360 (7) | 0.01803 (17) | |
Cl1 | 0.47805 (10) | 0.2500 | 0.0718 (2) | 0.0308 (6) | |
Cl2 | 0.41377 (9) | 0.2500 | 0.4111 (2) | 0.0347 (6) | |
P1 | 0.66211 (10) | 0.2500 | 0.2100 (2) | 0.0221 (5) | |
P2 | 0.57932 (10) | 0.2500 | 0.5371 (2) | 0.0233 (6) | |
P3 | 0.53321 (8) | 0.37973 (7) | 0.27518 (17) | 0.0273 (4) | |
C11 | 0.6660 (4) | 0.2500 | 0.0209 (8) | 0.032 (2) | |
H11A | 0.7178 | 0.2500 | −0.0104 | 0.049* | |
H11B | 0.6408 | 0.2069 | −0.0142 | 0.049* | |
C12 | 0.7266 (2) | 0.3256 (2) | 0.2488 (6) | 0.0303 (17) | |
H12A | 0.7740 | 0.3175 | 0.2015 | 0.045* | |
H12B | 0.7350 | 0.3282 | 0.3489 | 0.045* | |
H12C | 0.7047 | 0.3709 | 0.2165 | 0.045* | |
C21 | 0.6769 (3) | 0.2500 | 0.5976 (8) | 0.036 (2) | |
H21A | 0.6785 | 0.2500 | 0.6990 | 0.055* | |
H21B | 0.7020 | 0.2069 | 0.5623 | 0.055* | |
C22 | 0.5445 (3) | 0.3255 (3) | 0.6447 (6) | 0.057 (2) | |
H22A | 0.5627 | 0.3200 | 0.7397 | 0.086* | |
H22B | 0.4900 | 0.3252 | 0.6447 | 0.086* | |
H22C | 0.5624 | 0.3713 | 0.6065 | 0.086* | |
C31 | 0.5557 (3) | 0.4150 (3) | 0.1015 (6) | 0.0368 (16) | |
H31A | 0.5499 | 0.4675 | 0.1010 | 0.055* | |
H31B | 0.5221 | 0.3936 | 0.0331 | 0.055* | |
H31C | 0.6072 | 0.4027 | 0.0781 | 0.055* | |
C32 | 0.4370 (2) | 0.4140 (3) | 0.2916 (7) | 0.0447 (18) | |
H32A | 0.4369 | 0.4664 | 0.2789 | 0.067* | |
H32B | 0.4177 | 0.4023 | 0.3837 | 0.067* | |
H32C | 0.4056 | 0.3916 | 0.2208 | 0.067* | |
C33 | 0.5837 (3) | 0.4488 (3) | 0.3798 (6) | 0.046 (2) | |
H33A | 0.5700 | 0.4971 | 0.3476 | 0.069* | |
H33B | 0.6374 | 0.4420 | 0.3690 | 0.069* | |
H33C | 0.5703 | 0.4436 | 0.4776 | 0.069* | |
C1S | 0.2535 (3) | 0.4577 (2) | 0.8727 (8) | 0.069 (3) | |
H1SA | 0.2273 | 0.4919 | 0.9273 | 0.082* | |
C2S | 0.3127 (4) | 0.4177 (4) | 0.9316 (4) | 0.073 (3) | |
H2SA | 0.3263 | 0.4251 | 1.0255 | 0.088* | |
C3S | 0.3518 (2) | 0.3667 (3) | 0.8500 (8) | 0.068 (3) | |
H3SA | 0.3915 | 0.3399 | 0.8894 | 0.081* | |
C4S | 0.3316 (3) | 0.3557 (2) | 0.7096 (8) | 0.059 (2) | |
H4SA | 0.3578 | 0.3215 | 0.6550 | 0.071* | |
C5S | 0.2724 (3) | 0.3957 (3) | 0.6507 (4) | 0.059 (2) | |
H5SA | 0.2589 | 0.3883 | 0.5567 | 0.071* | |
C6S | 0.23327 (19) | 0.4467 (3) | 0.7323 (8) | 0.064 (3) | |
H6SA | 0.1936 | 0.4735 | 0.6929 | 0.076* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Ru1 | 0.0145 (3) | 0.0200 (3) | 0.0196 (4) | 0.000 | −0.0017 (4) | 0.000 |
Cl1 | 0.0333 (12) | 0.0318 (13) | 0.0275 (14) | 0.000 | −0.0146 (10) | 0.000 |
Cl2 | 0.0154 (11) | 0.0489 (14) | 0.0398 (15) | 0.000 | −0.0001 (10) | 0.000 |
P1 | 0.0212 (10) | 0.0254 (12) | 0.0197 (14) | 0.000 | 0.0015 (11) | 0.000 |
P2 | 0.0181 (11) | 0.0330 (14) | 0.0187 (14) | 0.000 | 0.0012 (10) | 0.000 |
P3 | 0.0230 (8) | 0.0249 (8) | 0.0339 (11) | 0.0015 (7) | −0.0029 (8) | −0.0031 (8) |
C11 | 0.029 (5) | 0.036 (6) | 0.032 (6) | 0.000 | 0.012 (4) | 0.000 |
C12 | 0.026 (3) | 0.029 (3) | 0.036 (5) | 0.002 (3) | 0.003 (3) | 0.000 (3) |
C21 | 0.023 (5) | 0.073 (7) | 0.013 (5) | 0.000 | −0.004 (4) | 0.000 |
C22 | 0.059 (4) | 0.081 (5) | 0.032 (4) | 0.027 (4) | −0.006 (4) | −0.018 (4) |
C31 | 0.048 (4) | 0.027 (3) | 0.035 (4) | −0.003 (3) | −0.002 (3) | 0.008 (3) |
C32 | 0.039 (4) | 0.031 (3) | 0.064 (5) | 0.009 (3) | −0.008 (4) | −0.001 (4) |
C33 | 0.039 (4) | 0.033 (4) | 0.066 (6) | −0.007 (3) | 0.003 (3) | −0.013 (4) |
C1S | 0.085 (6) | 0.053 (6) | 0.067 (7) | −0.029 (5) | 0.050 (5) | −0.019 (6) |
C2S | 0.099 (7) | 0.091 (8) | 0.029 (5) | −0.066 (5) | −0.019 (5) | 0.026 (6) |
C3S | 0.039 (4) | 0.063 (6) | 0.101 (9) | −0.009 (4) | −0.006 (5) | 0.041 (6) |
C4S | 0.056 (5) | 0.026 (4) | 0.097 (8) | −0.004 (3) | 0.049 (5) | −0.009 (5) |
C5S | 0.087 (6) | 0.059 (6) | 0.033 (5) | −0.050 (4) | −0.003 (5) | 0.007 (5) |
C6S | 0.035 (4) | 0.037 (5) | 0.119 (10) | −0.007 (3) | 0.010 (5) | 0.029 (6) |
Ru1—P1 | 2.2690 (19) | C22—H22B | 0.9600 |
Ru1—P2 | 2.297 (2) | C22—H22C | 0.9600 |
Ru1—P3i | 2.3819 (14) | C31—H31A | 0.9600 |
Ru1—P3 | 2.3819 (14) | C31—H31B | 0.9600 |
Ru1—Cl1 | 2.479 (2) | C31—H31C | 0.9600 |
Ru1—Cl2 | 2.5038 (19) | C32—H32A | 0.9600 |
P1—C11 | 1.790 (8) | C32—H32B | 0.9600 |
P1—C12 | 1.821 (4) | C32—H32C | 0.9600 |
P1—C12i | 1.821 (4) | C33—H33A | 0.9600 |
P2—C21 | 1.812 (6) | C33—H33B | 0.9600 |
P2—C22 | 1.816 (5) | C33—H33C | 0.9600 |
P2—C22i | 1.816 (5) | C1S—C2S | 1.3900 |
P3—C31 | 1.808 (5) | C1S—C6S | 1.3900 |
P3—C32 | 1.813 (4) | C1S—H1SA | 0.9300 |
P3—C33 | 1.831 (5) | C2S—C3S | 1.3900 |
C11—H11A | 0.9600 | C2S—H2SA | 0.9300 |
C11—H11B | 0.9598 | C3S—C4S | 1.3900 |
C12—H12A | 0.9600 | C3S—H3SA | 0.9300 |
C12—H12B | 0.9600 | C4S—C5S | 1.3900 |
C12—H12C | 0.9600 | C4S—H4SA | 0.9300 |
C21—H21A | 0.9600 | C5S—C6S | 1.3900 |
C21—H21B | 0.9599 | C5S—H5SA | 0.9300 |
C22—H22A | 0.9600 | C6S—H6SA | 0.9300 |
P1—Ru1—P2 | 97.07 (8) | H21A—C21—H21B | 109.5 |
P1—Ru1—P3i | 91.52 (4) | P2—C22—H22A | 109.5 |
P2—Ru1—P3i | 97.45 (4) | P2—C22—H22B | 109.5 |
P1—Ru1—P3 | 91.52 (4) | H22A—C22—H22B | 109.5 |
P2—Ru1—P3 | 97.45 (4) | P2—C22—H22C | 109.5 |
P3i—Ru1—P3 | 164.31 (8) | H22A—C22—H22C | 109.5 |
P1—Ru1—Cl1 | 94.79 (8) | H22B—C22—H22C | 109.5 |
P2—Ru1—Cl1 | 168.14 (7) | P3—C31—H31A | 109.5 |
P3i—Ru1—Cl1 | 82.20 (4) | P3—C31—H31B | 109.5 |
P3—Ru1—Cl1 | 82.20 (4) | H31A—C31—H31B | 109.5 |
P1—Ru1—Cl2 | 179.01 (9) | P3—C31—H31C | 109.5 |
P2—Ru1—Cl2 | 81.94 (7) | H31A—C31—H31C | 109.5 |
P3i—Ru1—Cl2 | 88.61 (4) | H31B—C31—H31C | 109.5 |
P3—Ru1—Cl2 | 88.61 (4) | P3—C32—H32A | 109.5 |
Cl1—Ru1—Cl2 | 86.20 (7) | P3—C32—H32B | 109.5 |
C11—P1—C12 | 100.2 (2) | H32A—C32—H32B | 109.5 |
C11—P1—C12i | 100.2 (2) | P3—C32—H32C | 109.5 |
C12—P1—C12i | 98.0 (3) | H32A—C32—H32C | 109.5 |
C11—P1—Ru1 | 115.2 (2) | H32B—C32—H32C | 109.5 |
C12—P1—Ru1 | 119.71 (17) | P3—C33—H33A | 109.5 |
C12i—P1—Ru1 | 119.71 (17) | P3—C33—H33B | 109.5 |
C21—P2—C22 | 98.3 (2) | H33A—C33—H33B | 109.5 |
C21—P2—C22i | 98.3 (2) | P3—C33—H33C | 109.5 |
C22—P2—C22i | 98.3 (4) | H33A—C33—H33C | 109.5 |
C21—P2—Ru1 | 124.3 (3) | H33B—C33—H33C | 109.5 |
C22—P2—Ru1 | 116.5 (2) | C2S—C1S—C6S | 120.0 |
C22i—P2—Ru1 | 116.5 (2) | C2S—C1S—H1SA | 120.0 |
C31—P3—C32 | 99.3 (3) | C6S—C1S—H1SA | 120.0 |
C31—P3—C33 | 98.1 (3) | C3S—C2S—C1S | 120.0 |
C32—P3—C33 | 99.9 (2) | C3S—C2S—H2SA | 120.0 |
C31—P3—Ru1 | 115.93 (18) | C1S—C2S—H2SA | 120.0 |
C32—P3—Ru1 | 113.76 (17) | C2S—C3S—C4S | 120.0 |
C33—P3—Ru1 | 125.57 (19) | C2S—C3S—H3SA | 120.0 |
P1—C11—H11A | 110.1 | C4S—C3S—H3SA | 120.0 |
P1—C11—H11B | 109.1 | C3S—C4S—C5S | 120.0 |
H11A—C11—H11B | 109.5 | C3S—C4S—H4SA | 120.0 |
P1—C12—H12A | 109.5 | C5S—C4S—H4SA | 120.0 |
P1—C12—H12B | 109.5 | C6S—C5S—C4S | 120.0 |
H12A—C12—H12B | 109.5 | C6S—C5S—H5SA | 120.0 |
P1—C12—H12C | 109.5 | C4S—C5S—H5SA | 120.0 |
H12A—C12—H12C | 109.5 | C5S—C6S—C1S | 120.0 |
H12B—C12—H12C | 109.5 | C5S—C6S—H6SA | 120.0 |
P2—C21—H21A | 110.1 | C1S—C6S—H6SA | 120.0 |
P2—C21—H21B | 109.1 |
Symmetry code: (i) x, −y+1/2, z. |
Experimental details
Crystal data | |
Chemical formula | [RuCl2(C3H9P)4]·2C6H6 |
Mr | 632.47 |
Crystal system, space group | Orthorhombic, Pnma |
Temperature (K) | 173 |
a, b, c (Å) | 17.6243 (15), 18.1889 (19), 9.4610 (11) |
V (Å3) | 3032.9 (5) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.92 |
Crystal size (mm) | 0.18 × 0.12 × 0.06 |
Data collection | |
Diffractometer | Oxford Diffraction Gemini S Ultra |
Absorption correction | Multi-scan (CrysAlis RED; Oxford Diffraction, 2008) |
Tmin, Tmax | 0.949, 1.000 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 14352, 3550, 1653 |
Rint | 0.148 |
(sin θ/λ)max (Å−1) | 0.650 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.058, 0.081, 0.82 |
No. of reflections | 3550 |
No. of parameters | 139 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.97, −0.57 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2008), CrysAlis RED (Oxford Diffraction, 2008), SHELXTL (Sheldrick, 2008).
Ru1—P1 | 2.2690 (19) | Ru1—Cl1 | 2.479 (2) |
Ru1—P2 | 2.297 (2) | Ru1—Cl2 | 2.5038 (19) |
Ru1—P3 | 2.3819 (14) |
Acknowledgements
The authors acknowledge financial support from the Young Talent Project of Department of Science & Technology of Fujian Province (grant No. 2007 F3095).
References
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Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122. Web of Science CrossRef CAS IUCr Journals Google Scholar
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The ruthenium(II) complex trans-[RuCl2(PMe3)4], which can be readily prepared from the reaction of RuCl2(PPh3)3 with PMe3 in hexane at room temperature (Gotzig et al., 1985), has proved to be a useful precursor for a wide variety of ruthenium compounds (Hartwig et al., 1991; Kohlmann & Werner, 1993; Csok et al., 2007; Hirano et al., 2010). However, its geometrical isomer, cis-[RuCl2(PMe3)4], has not been reported yet. During our preparation of ruthenium compounds with phosphine ligands using trans-[RuCl2(PMe3)4] as the starting material, we found that the trans-isomer slowly isomerizes to the cis-isomer, the structure of which we report here as the benzene disolvate.
As shown in Fig.1, the structure of the title complex possesses a crystallographic mirror plane passing through the RuII atom, the two cis-disposed Cl ligands and the two P atoms as well as two C atoms of the two cis-disposed PMe3 ligands. Thus the asymmetric unit of the structure contains half of a molecule. The RuII atom adopts a distorted octahedral geometry with the two trans-disposed P atoms occupying the axial positions. The bond lengths of the two axial Ru—P bonds (2.3819 (14) Å), which are actually image-related, are slightly longer than those of the two equatorial Ru—P bonds which are trans to the Cl ligands (2.2690 (19) and 2.297 (2) Å, respectively). The two Ru—Cl bond lengths are 2.479 (2) and 2.5038 (19) Å, respectively, while the Cl(1)—Ru(1)—Cl(2) bond angle is 86.20 (7)°. These geometric values are similar to those reported for the only example of a sructurally characterized monodentate tetrakis(phosphine)-cis-dichlorido-ruthenium(II) complex, viz. [cis-RuCl2(PTA)4] (PTA = 1,3,5-triaza-7-phospha-adamantane-κP); 2.488 (2) and 2.503 (2) Å, 84.2 (1) °; Joo et al., 1994).
The packing of the structure (Fig. 2) is accomplished through non-classical C—H···Cl hydrogen bonds between the benzene solvent molecule and one of the Cl ligands (Table 2).