Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S0108270107061902/sq3114sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S0108270107061902/sq3114Isup2.hkl | |
Portable Document Format (PDF) file https://doi.org/10.1107/S0108270107061902/sq3114sup3.pdf |
CCDC reference: 677204
For related literature, see: Allen (2002); Alrichs et al. (1989); Basato et al. (2003); Bruno et al. (2002); Bugarcic et al. (1991); Elding & Oskarsson (1985); Hansson & Oskarsson (2007); Hansson et al. (2006); Kleywegt et al. (1985).
Pt(Me2S)2I2 (0.317 g, 0.554 mmol) was dissolved in 15 ml of acetone. Ag(CH3COO) (0.192 g, 1.15 mmol) was added, and the reaction mixture was stirred for 90 min. Solid AgI was then removed by filtration. The pale-yellow acetone solution was left to evaporate slowly, which resulted in a yellow solid. Crystals suitable for X-ray diffraction experiments were obtained from recrystallization in a diethyl ether–ethanol mixture (2:1 in volume). DFT calculations were performed at the s-VWN level with the basis sets def-TZVPP for Pt, TZVPP for S and O, and 6–31G* for C and H atoms, using the software TURBOMOLE 5.5 (Alrichs et al., 1989).
H-atoms were positioned geometrically and treated as riding on the adjacent C atom [C—H = 0.96 Å and Uiso(H) = 1.5Ueq(C)].
Data collection: CrysAlis CCD (Oxford Diffraction, 2006); cell refinement: CrysAlis RED (Oxford Diffraction, 2006); data reduction: CrysAlis RED (Oxford Diffraction, 2006); program(s) used to solve structure: SHELXTL (Sheldrick, 1998); program(s) used to refine structure: SHELXTL (Sheldrick, 1998); molecular graphics: DIAMOND (Brandenburg, 2000); software used to prepare material for publication: CRYSTALS (Betteridge et al., 2003) and enCIFer (Allen et al., 2004).
[Pt(C2H3O2)2(C2H6S)2] | F(000) = 832 |
Mr = 437.43 | Dx = 2.156 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 6622 reflections |
a = 8.7306 (5) Å | θ = 2.4–32.5° |
b = 10.3274 (5) Å | µ = 10.71 mm−1 |
c = 15.5205 (9) Å | T = 295 K |
β = 105.623 (3)° | Plate, yellow |
V = 1347.69 (13) Å3 | 0.28 × 0.12 × 0.05 mm |
Z = 4 |
Oxford Diffraction XCALIBUR3 diffractometer | 4530 independent reflections |
Radiation source: Sealed tube | 3389 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.059 |
ω–scans | θmax = 32.5°, θmin = 2.4° |
Absorption correction: numerical (CrysAlis RED; Oxford Diffraction, 2006) | h = −12→12 |
Tmin = 0.115, Tmax = 0.629 | k = −15→10 |
12845 measured reflections | l = −22→23 |
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)] = 0.029 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.073 | H-atom parameters constrained |
S = 0.97 | w = 1/[σ2(Fo2) + (0.0352P)2] where P = (Fo2 + 2Fc2)/3 |
4530 reflections | (Δ/σ)max = 0.002 |
136 parameters | Δρmax = 1.71 e Å−3 |
0 restraints | Δρmin = −1.15 e Å−3 |
[Pt(C2H3O2)2(C2H6S)2] | V = 1347.69 (13) Å3 |
Mr = 437.43 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 8.7306 (5) Å | µ = 10.71 mm−1 |
b = 10.3274 (5) Å | T = 295 K |
c = 15.5205 (9) Å | 0.28 × 0.12 × 0.05 mm |
β = 105.623 (3)° |
Oxford Diffraction XCALIBUR3 diffractometer | 4530 independent reflections |
Absorption correction: numerical (CrysAlis RED; Oxford Diffraction, 2006) | 3389 reflections with I > 2σ(I) |
Tmin = 0.115, Tmax = 0.629 | Rint = 0.059 |
12845 measured reflections |
R[F2 > 2σ(F2)] = 0.029 | 0 restraints |
wR(F2) = 0.073 | H-atom parameters constrained |
S = 0.97 | Δρmax = 1.71 e Å−3 |
4530 reflections | Δρmin = −1.15 e Å−3 |
136 parameters |
Experimental. The intensity data was collected on an Oxford Diffraction Xcalibur3 diffractometer at 295 K. Exposure time was 20 s and frame width 0.75°. For each crystal, 552 frames were collected with one reference frame every 50t h frame. No decay was observed. The structure was solved using Patterson and difference Fourier methods, and the structure was refined with full-matrix least-square calculations. All non-H atoms were refined anisotropically. |
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 | ||
Pt1 | 0.434083 (16) | 0.095433 (13) | 0.900324 (9) | 0.03304 (5) | |
S1 | 0.65690 (11) | 0.02181 (10) | 0.86853 (6) | 0.0391 (2) | |
S2 | 0.27365 (13) | −0.05173 (10) | 0.81290 (7) | 0.0431 (2) | |
O1 | 0.2535 (4) | 0.1649 (3) | 0.94666 (18) | 0.0479 (7) | |
O3 | 0.5713 (4) | 0.2267 (3) | 0.98561 (18) | 0.0485 (7) | |
O2 | 0.1427 (5) | 0.2960 (4) | 0.8336 (2) | 0.0688 (10) | |
O4 | 0.5971 (5) | 0.3568 (4) | 0.8767 (2) | 0.0695 (10) | |
C7 | 0.6168 (5) | 0.3325 (4) | 0.9550 (3) | 0.0412 (8) | |
C5 | 0.1497 (5) | 0.2469 (4) | 0.9055 (3) | 0.0427 (9) | |
C2 | 0.6406 (6) | −0.1478 (4) | 0.8385 (3) | 0.0516 (10) | |
H2A | 0.5595 | −0.1589 | 0.7833 | 0.077* | |
H2B | 0.6133 | −0.1966 | 0.8849 | 0.077* | |
H2C | 0.7405 | −0.1779 | 0.8314 | 0.077* | |
C1 | 0.6592 (7) | 0.0864 (5) | 0.7605 (4) | 0.0615 (14) | |
H1A | 0.7410 | 0.0444 | 0.7401 | 0.092* | |
H1B | 0.6798 | 0.1778 | 0.7657 | 0.092* | |
H1C | 0.5579 | 0.0714 | 0.7184 | 0.092* | |
C4 | 0.1166 (6) | −0.0896 (5) | 0.8629 (4) | 0.0623 (14) | |
H4A | 0.0627 | −0.0115 | 0.8711 | 0.093* | |
H4B | 0.1603 | −0.1303 | 0.9199 | 0.093* | |
H4C | 0.0425 | −0.1475 | 0.8246 | 0.093* | |
C8 | 0.6983 (7) | 0.4268 (5) | 1.0266 (4) | 0.0656 (15) | |
H8A | 0.7311 | 0.5015 | 0.9994 | 0.098* | |
H8B | 0.7899 | 0.3863 | 1.0657 | 0.098* | |
H8C | 0.6261 | 0.4527 | 1.0603 | 0.098* | |
C3 | 0.1627 (7) | 0.0336 (5) | 0.7156 (3) | 0.0614 (13) | |
H3A | 0.0723 | −0.0172 | 0.6851 | 0.092* | |
H3B | 0.2291 | 0.0488 | 0.6764 | 0.092* | |
H3C | 0.1272 | 0.1149 | 0.7332 | 0.092* | |
C6 | 0.0294 (6) | 0.2790 (5) | 0.9570 (4) | 0.0610 (12) | |
H6A | −0.0526 | 0.3331 | 0.9209 | 0.092* | |
H6B | 0.0816 | 0.3238 | 1.0111 | 0.092* | |
H6C | −0.0170 | 0.2005 | 0.9714 | 0.092* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Pt1 | 0.03463 (8) | 0.03450 (8) | 0.03047 (8) | 0.00007 (6) | 0.00960 (6) | 0.00010 (5) |
S1 | 0.0342 (5) | 0.0454 (5) | 0.0381 (5) | 0.0001 (4) | 0.0102 (4) | −0.0028 (4) |
S2 | 0.0391 (5) | 0.0388 (5) | 0.0502 (6) | −0.0039 (4) | 0.0101 (4) | −0.0053 (4) |
O1 | 0.0521 (18) | 0.0533 (17) | 0.0442 (15) | 0.0164 (14) | 0.0233 (14) | 0.0079 (13) |
O3 | 0.0639 (19) | 0.0463 (15) | 0.0335 (13) | −0.0093 (15) | 0.0099 (13) | −0.0051 (12) |
O2 | 0.074 (2) | 0.087 (3) | 0.0485 (18) | 0.033 (2) | 0.0219 (17) | 0.0194 (17) |
O4 | 0.093 (3) | 0.070 (2) | 0.0440 (18) | −0.028 (2) | 0.0160 (19) | 0.0047 (17) |
C7 | 0.038 (2) | 0.044 (2) | 0.043 (2) | −0.0018 (16) | 0.0136 (17) | −0.0095 (17) |
C5 | 0.038 (2) | 0.046 (2) | 0.043 (2) | 0.0012 (17) | 0.0095 (17) | −0.0055 (17) |
C2 | 0.049 (3) | 0.043 (2) | 0.060 (3) | 0.007 (2) | 0.011 (2) | −0.006 (2) |
C1 | 0.070 (4) | 0.069 (3) | 0.058 (3) | 0.011 (2) | 0.039 (3) | 0.016 (2) |
C4 | 0.041 (2) | 0.083 (4) | 0.060 (3) | −0.020 (2) | 0.009 (2) | 0.008 (2) |
C8 | 0.073 (4) | 0.065 (3) | 0.059 (3) | −0.018 (3) | 0.019 (3) | −0.027 (2) |
C3 | 0.077 (4) | 0.065 (3) | 0.035 (2) | −0.008 (3) | 0.003 (2) | −0.003 (2) |
C6 | 0.050 (3) | 0.068 (3) | 0.073 (3) | 0.014 (2) | 0.030 (2) | 0.005 (3) |
Pt1—O1 | 2.032 (3) | C2—H2C | 0.9600 |
Pt1—O3 | 2.043 (3) | C1—H1A | 0.9600 |
Pt1—S2 | 2.2559 (10) | C1—H1B | 0.9600 |
Pt1—S1 | 2.2633 (10) | C1—H1C | 0.9600 |
S1—C2 | 1.808 (4) | C4—H4A | 0.9600 |
S1—C1 | 1.809 (5) | C4—H4B | 0.9600 |
S2—C3 | 1.791 (5) | C4—H4C | 0.9600 |
S2—C4 | 1.792 (5) | C8—H8A | 0.9600 |
O1—C5 | 1.278 (5) | C8—H8B | 0.9600 |
O3—C7 | 1.296 (5) | C8—H8C | 0.9600 |
O2—C5 | 1.213 (5) | C3—H3A | 0.9600 |
O4—C7 | 1.207 (5) | C3—H3B | 0.9600 |
C7—C8 | 1.504 (6) | C3—H3C | 0.9600 |
C5—C6 | 1.517 (6) | C6—H6A | 0.9600 |
C2—H2A | 0.9600 | C6—H6B | 0.9600 |
C2—H2B | 0.9600 | C6—H6C | 0.9600 |
Pt1···Pt1i | 3.5868 (2) | ||
O1—Pt1—O3 | 84.94 (13) | H1A—C1—H1B | 109.5 |
O1—Pt1—S2 | 92.04 (10) | S1—C1—H1C | 109.5 |
O3—Pt1—S2 | 176.24 (9) | H1A—C1—H1C | 109.5 |
O1—Pt1—S1 | 171.97 (9) | H1B—C1—H1C | 109.5 |
O3—Pt1—S1 | 88.61 (9) | S2—C4—H4A | 109.5 |
S2—Pt1—S1 | 94.21 (4) | S2—C4—H4B | 109.5 |
C2—S1—C1 | 97.9 (2) | H4A—C4—H4B | 109.5 |
C2—S1—Pt1 | 111.66 (16) | S2—C4—H4C | 109.5 |
C1—S1—Pt1 | 107.61 (18) | H4A—C4—H4C | 109.5 |
C3—S2—C4 | 99.8 (3) | H4B—C4—H4C | 109.5 |
C3—S2—Pt1 | 106.43 (17) | C7—C8—H8A | 109.5 |
C4—S2—Pt1 | 108.07 (18) | C7—C8—H8B | 109.5 |
C5—O1—Pt1 | 124.8 (3) | H8A—C8—H8B | 109.5 |
C7—O3—Pt1 | 120.4 (3) | C7—C8—H8C | 109.5 |
O4—C7—O3 | 124.7 (4) | H8A—C8—H8C | 109.5 |
O4—C7—C8 | 121.3 (4) | H8B—C8—H8C | 109.5 |
O3—C7—C8 | 114.0 (4) | S2—C3—H3A | 109.5 |
O2—C5—O1 | 126.1 (4) | S2—C3—H3B | 109.5 |
O2—C5—C6 | 121.5 (4) | H3A—C3—H3B | 109.5 |
O1—C5—C6 | 112.4 (4) | S2—C3—H3C | 109.5 |
S1—C2—H2A | 109.5 | H3A—C3—H3C | 109.5 |
S1—C2—H2B | 109.5 | H3B—C3—H3C | 109.5 |
H2A—C2—H2B | 109.5 | C5—C6—H6A | 109.5 |
S1—C2—H2C | 109.5 | C5—C6—H6B | 109.5 |
H2A—C2—H2C | 109.5 | H6A—C6—H6B | 109.5 |
H2B—C2—H2C | 109.5 | C5—C6—H6C | 109.5 |
S1—C1—H1A | 109.5 | H6A—C6—H6C | 109.5 |
S1—C1—H1B | 109.5 | H6B—C6—H6C | 109.5 |
O3—Pt1—S1—C2 | 150.75 (19) | O3—Pt1—O1—C5 | 100.4 (3) |
S2—Pt1—S1—C2 | −26.75 (17) | S2—Pt1—O1—C5 | −81.8 (3) |
O3—Pt1—S1—C1 | −102.9 (2) | O1—Pt1—O3—C7 | −104.8 (3) |
S2—Pt1—S1—C1 | 79.6 (2) | S1—Pt1—O3—C7 | 79.9 (3) |
O1—Pt1—S2—C3 | 79.1 (2) | Pt1—O3—C7—O4 | −7.4 (6) |
S1—Pt1—S2—C3 | −105.9 (2) | Pt1—O3—C7—C8 | 172.3 (3) |
O1—Pt1—S2—C4 | −27.3 (2) | Pt1—O1—C5—O2 | −0.3 (6) |
S1—Pt1—S2—C4 | 147.70 (19) | Pt1—O1—C5—C6 | 179.6 (3) |
Symmetry code: (i) −x+1, −y, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2B···O1i | 0.96 | 2.58 | 3.216 (5) | 124 |
C4—H4B···O3i | 0.96 | 2.60 | 3.392 (6) | 139 |
C2—H2A···O4ii | 0.96 | 2.50 | 3.425 (6) | 163 |
C4—H4C···O2iii | 0.96 | 2.62 | 3.479 (6) | 150 |
C3—H3A···O2iii | 0.96 | 2.65 | 3.552 (7) | 156 |
C1—H1B···S2iv | 0.96 | 3.12 | 3.996 (6) | 153 |
Symmetry codes: (i) −x+1, −y, −z+2; (ii) −x+1, y−1/2, −z+3/2; (iii) −x, y−1/2, −z+3/2; (iv) −x+1, y+1/2, −z+3/2. |
Experimental details
Crystal data | |
Chemical formula | [Pt(C2H3O2)2(C2H6S)2] |
Mr | 437.43 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 295 |
a, b, c (Å) | 8.7306 (5), 10.3274 (5), 15.5205 (9) |
β (°) | 105.623 (3) |
V (Å3) | 1347.69 (13) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 10.71 |
Crystal size (mm) | 0.28 × 0.12 × 0.05 |
Data collection | |
Diffractometer | Oxford Diffraction XCALIBUR3 diffractometer |
Absorption correction | Numerical (CrysAlis RED; Oxford Diffraction, 2006) |
Tmin, Tmax | 0.115, 0.629 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12845, 4530, 3389 |
Rint | 0.059 |
(sin θ/λ)max (Å−1) | 0.757 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.029, 0.073, 0.97 |
No. of reflections | 4530 |
No. of parameters | 136 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.71, −1.15 |
Computer programs: CrysAlis CCD (Oxford Diffraction, 2006), CrysAlis RED (Oxford Diffraction, 2006), SHELXTL (Sheldrick, 1998), DIAMOND (Brandenburg, 2000), CRYSTALS (Betteridge et al., 2003) and enCIFer (Allen et al., 2004).
Pt1—O1 | 2.032 (3) | O3—C7 | 1.296 (5) |
Pt1—O3 | 2.043 (3) | O2—C5 | 1.213 (5) |
Pt1—S2 | 2.2559 (10) | O4—C7 | 1.207 (5) |
Pt1—S1 | 2.2633 (10) | C7—C8 | 1.504 (6) |
O1—C5 | 1.278 (5) | C5—C6 | 1.517 (6) |
Pt1···Pt1i | 3.5868 (2) | ||
O1—Pt1—O3 | 84.94 (13) | O3—Pt1—S1 | 88.61 (9) |
O1—Pt1—S2 | 92.04 (10) | S2—Pt1—S1 | 94.21 (4) |
O3—Pt1—S2 | 176.24 (9) | C5—O1—Pt1 | 124.8 (3) |
O1—Pt1—S1 | 171.97 (9) | C7—O3—Pt1 | 120.4 (3) |
Symmetry code: (i) −x+1, −y, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
C2—H2B···O1i | 0.96 | 2.58 | 3.216 (5) | 124 |
C4—H4B···O3i | 0.96 | 2.60 | 3.392 (6) | 139 |
C2—H2A···O4ii | 0.96 | 2.50 | 3.425 (6) | 163 |
C4—H4C···O2iii | 0.96 | 2.62 | 3.479 (6) | 150 |
C3—H3A···O2iii | 0.96 | 2.65 | 3.552 (7) | 156 |
C1—H1B···S2iv | 0.96 | 3.12 | 3.996 (6) | 153 |
Symmetry codes: (i) −x+1, −y, −z+2; (ii) −x+1, y−1/2, −z+3/2; (iii) −x, y−1/2, −z+3/2; (iv) −x+1, y+1/2, −z+3/2. |
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No diacetatoplatinum(II) complex with sulfur donor ligands has previously been reported to the Cambridge Structural Database (CSD; Version 5.28 of November 2006; Allen, 2002). Out of 13 acetatoplatinum(II) complexes found in the CSD, eight contain acetate ligands that bridge two platinum(II) ions (in one case one acetate ligand coordinates to three platinum ions), two are cis- and two trans-complexes, and one complex contains a single acetate ligand. Only one diacetatoplatinum(II) complex with nonbridging acetate ligands and identical nonchelating neutral ligands is reported, trans-[Pt(CH3COO)2(PPh3)2] (Basato et al., 2003). Acetate and nitrate ions are topologically related, and the structure of cis-[Pt(Me2S)2(NO3)2] has recently been reported (Hansson & Oskarsson, 2007). We report here the crystal structure of the title compound with emphasis on (i) the coordination mode of the acetate ion compared with the nitrate ion; (ii) the packing of the title compound in relation to other PtX2L2 compounds, X being a ligand with charge -1 and L being a neutral ligand; and (iii) the coordination mode of dimethyl sulfide (dms) in relation to other PtIIA4-n(Me2S)n (where A is any ligand and n = 1–4) complexes.
cis-[Pt(CH3COO)2(Me2S)2], (I), has a pseudo-square-planar coordination geometry (Fig. 1). The Pt—O and Pt—S bonds (Table 1) illustrate the different trans influence of the O and S atoms, which was previously observed in cis-[Pt(Me2S)2(NO3)2] (Hansson & Oskarsson, 2007). The Pt—O distances are elongated by ~0.04 Å compared with those in [Pt(NO3)4]2- (Elding & Oskarsson, 1985) and the Pt—S distances are shortened ~0.06 Å compared with [Pt(Me2S)4]2+ (Bugarcic et al., 1991)
The two acetate ligands coordinate in a monodentate fashion via one of the O atoms, as shown by the differences in the Pt1—O1/Pt1—O2 and Pt1—O3/Pt1—O4 distances being more than 1 Å and thus fulfilling the criterion of a difference of more than 0.6 Å suggested by Kleywegt et al. (1985) for monodentate nitrate ligands. This is further supported by the differences in the C5—O1/ C5—O2 and C7—O3/C7—O4 distances, which are approximately 0.1 Å (Table 1). Both acetate ligands are oriented almost perpendicular to the coordination plane, as shown by the torsion angles S2—Pt1—O1—C5 [-81.8 (3)°] and S1—Pt1—O3—C7 [79.9 (3)°], and both the noncoordinated O2 and O4 atoms are on the same side of the coordination plane. In the corresponding cis-[PtL2(NO3)2] complexes, seven have nitrate ions on opposite sides, five on the same side and two in the plane (Hansson & Oskarsson, 2007). The most striking difference in behavior between acetate and nitrate in these systems is the greater tendency of the acetate ion to form bridging polynuclear complexes compared with the nitrate ion.
The dms ligands are oriented similarly and coordinate to the platinum in a semi-staggered conformation, with C—S1—Pt1—S2 and C—S2—Pt1—O1 torsion angles of ~79 and ~-27°.
The packing of the title compound features centrosymmetric dimers (Fig. 2) across (1/2, 0, 0) and (1/2, 1/2, 1/2), which are held together by C—H···O—Pt interactions (H2B—O1i = 2.58 Å and H4B—O3i = 2.60 Å; all symmetry codes as in Table 2). The Pt1···Pt1i distance is 3.5868 (2) Å, which probably also represents an attractive interaction, since the stabilizing energy of the dimer is 57 kJ mol-1 monomer according to density functional theory (DFT) calculations. The centers of gravity of the dimers form an I-centered monoclinic unit cell (easily seen after a suitable unit-cell transformation), i.e. each dimer is surrounded by 14 others. It is interesting to note that such a packing is common for centrosymmetric trans-[PtX2L2] compounds (Hansson et al., 2006). The four carbonyl O atoms point towards neighbouring dimers and are directed along the c axis. These atoms take part in C—H···O═C interactions with H2A—O4ii = 2.50 Å, H4C—O2iii = 2.62 Å and H3A—O2iii = 2.65 Å. Voids are formed at (0, 0, 0), (0, 0, 1/2) and (1/2, 0, 1/2). Six-membered rings are formed around the voids with C—H···O interactions.
A CONQUEST (Bruno et al., 2002) search of the CSD for PtII compounds with one or more dms molecules coordinated to the metal centre resulted in 44 complexes of the type [PtIIA4-n(Me2S)n] (where A is any ligand), containing in total 79 dm s ligands (deposited material). Complexes with bridging dms ligands and compounds without atomic coordinates reported in the database were excluded. The angle between the two Me—S bonds and the coordination plane was estimated using the C—S—Pt—A torsion angle (where A is cis to the Me2S ligand, and n = 1–4). Three different behaviours are observed. Four Me2S (5%) ligands have both methyl groups on the same side of the coordination plane, and 15 (19%) are close to eclipsed with one torsion angle in the range 2–12°. However, the staggered conformation with torsion angle 35–55° dominates strongly (69% of the 79 reported Me2S ligands).