Supporting information
Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536807029534/lh2429sup1.cif | |
Structure factor file (CIF format) https://doi.org/10.1107/S1600536807029534/lh2429Isup2.hkl |
CCDC reference: 654814
Key indicators
- Single-crystal X-ray study
- T = 220 K
- Mean (C-C) = 0.013 Å
- R factor = 0.044
- wR factor = 0.116
- Data-to-parameter ratio = 17.9
checkCIF/PLATON results
No syntax errors found
Alert level B PLAT222_ALERT_3_B Large Non-Solvent H Ueq(max)/Ueq(min) ... 4.13 Ratio PLAT232_ALERT_2_B Hirshfeld Test Diff (M-X) Pt - Br .. 12.55 su
Alert level C PLAT152_ALERT_1_C Supplied and Calc Volume s.u. Inconsistent ..... ? PLAT220_ALERT_2_C Large Non-Solvent C Ueq(max)/Ueq(min) ... 3.12 Ratio PLAT342_ALERT_3_C Low Bond Precision on C-C Bonds (x 1000) Ang ... 13 PLAT790_ALERT_4_C Centre of Gravity not Within Unit Cell: Resd. # 1 C12 H26 Br2 N2 O4 Pt
Alert level G PLAT793_ALERT_1_G Check the Absolute Configuration of N = ... S PLAT794_ALERT_5_G Check Predicted Bond Valency for Pt (2) 2.58
0 ALERT level A = In general: serious problem 2 ALERT level B = Potentially serious problem 4 ALERT level C = Check and explain 2 ALERT level G = General alerts; check 2 ALERT type 1 CIF construction/syntax error, inconsistent or missing data 2 ALERT type 2 Indicator that the structure model may be wrong or deficient 2 ALERT type 3 Indicator that the structure quality may be low 1 ALERT type 4 Improvement, methodology, query or suggestion 1 ALERT type 5 Informative message, check
For background information, see: Kaluđerović, Đinović et al. (2005); Kaluđerović, Miljković et al. (2005); Kaluđerović, Schmidt, Schwieger et al. (2007); Kaluđerović, Schmidt, Wagner et al. (2007). For related literature, see: Contreras et al. (2001); Hindmarsh et al. (1997); Hughes et al. (2001); Rostovtsev et al. (2002).
[{PtBr2Me2}n] (0.3 mmol) and Et2edda.2HCl (0.3 mmol) were suspended in methanol-chloroform solution (10 ml, 1:1 v/v). The mixture was stirred under reflux for 2 h. From the resulting yellow solution the title complex crystallized as well shaped crystals within one week at room temperature.
H atoms were included in calculated positions [C—H = 0.97–0.98 Å; N—H = 0.92 Å] and included in the refinement in a riding-model approximation with Uiso(H) = 1.2Ueq(C) and Uiso(H6) = 0.023 Å3.
In this paper, we report the structure of trans,cis-dibromodimethyl(O,O'-diethyl-ethylenediamine- N,N'-diacetate)platinum(IV) (configuration index: OC-6–13) trans,cis-[PtBr2Me2(Et2edda)], prepared as part of our investigation on basic coordination modes and antitumoral activity of platinum(IV) complexes with esters of H2edda-type (ethylenediamine-N,N'-diacetatic acid) ligands (Kaluđerović, Đinović et al., 2005; Kaluđerović, Miljković et al., 2005; Kaluđerović, Schmidt, Schwieger et al., 2007).
The title compound crystallizes in the space group C2/c as isolated molecules and exhibits a crystallographically imposed C2 symmetry axis bisecting the C2—C2i bond and passing through the Pt atom. The Pt atom adopts a [Br2C2N2] distorted octahedral coordination; the Pt, C, N atoms lie in a plane with meaningless deviation from the mean plane: 0.004 (6) Å and 0.005 (9) Å for N and C1 atoms, respectively. Due to the C2 symmetry, the five-membered ring PtNC2C2iNi exibits an ideal half twisted conformation with a twist around the C2—C2i bond. Because of an inversion center within the unit cell the compound crystallized as a mixture of molecules with λ and δ oriented five-membered cycles in 1:1 ratio. Fig. 1 illustrates the λ oriented complex.
Almost all angles in the coordination polyhedron are very close to the ideal value of 90° (87.1 (5) - 91.0 (2)°), with the exception of angles N—Pt—Ni = 80.8 (3)° and C1—Pt—N = 96.0 (3)°, due to the constraints of the chelate binding Et2edda ligand. The angle N—Pt—Ni is smaller than in structures [PtCl4(R2edda)] (R = Me, 83.1 (6)°; Et, 84.0 (3)°, (I); Kaluđerović, Schmidt, Schwieger et al., 2007), [PtBr4(en)] (83.1 (9)°; Hindmarsh et al., 1997), [PdCl2(R4edta)] (R = Me, 85.9 (2)°; Et, 85.6 (3)°; Kaluđerović, Schmidt, Wagner et al., 2007) and in [PtMe2I2(tmeda)], (II), [PtMe2I(n-C3F7)(tmeda)], (III), and [PtMeI2(n-C3F7)(tmeda)], (IV), (tmeda = tetramethyl-N,N,N',N'-ethylenediamine; 82.3 (2) - 82.8 (5)°; Hughes et al., 2001).
The Pt—C1 bond length of 2.052 (8) Å is comparable to the Pt—C distances found in trans-[PtBr2Me2{o-Ph2P(S)C6H4SMe- κ2S,S}], 2.065 (6)/2.106 (5) Å (Contreras et al., 2001) and in [Pt(X)(OMe)(Me)2(tmeda)] structures (X = OH, OOH), 2.007 (8) - 2.07 (2) Å (Rostovtsev et al., 2002). The Pt—Br bond lengths (2.443 (1) Å) are similar to those found in (I) (2.447 (1)/2.460 (1) Å), [PtBr4(L)] (L = ethylenediamine, 2.461 (2)/2.448 (2) Å; 1,3-propylenediamine, 2.452 (4)/2.455 (4) Å; Hindmarsh et al., 1997). In accordance with the high trans influence of the Me ligand the Pt—N bond (2.234 (6) Å) is relatively long although comparable with structures (II), (III) and (IV) (2.226 (5) - 2.312 (7) Å; Hughes et al., 2001), in which the Me ligand is also trans to N atom. The Pt—N bonds with Cl ((I): 2.110 (6) Å) or Br ([PtBr4(L)]; L = ethylenediamine, 2.05 (2) Å; L = 1,3-propylenediamine, 2.04 (3) Å; Hindmarsh et al., 1997) trans to a N atom are shorter relative to corresponding bond length in the title compound. Weak intramolecular H-bond (C5—H···O1) may stabilize the structure (distance C5···O1 = 2.70 (1) Å).
Besides trans-[PtBr2Me2{o-Ph2P(S)C6H4SMe- κ2S,S}] (Contreras et al., 2001), the title complex is the only other mononuclear dibromodimethylplatinum(IV) complex that has been structurally characterized to date.
For background information, see: Kaluđerović, Đinović et al. (2005); Kaluđerović, Miljković et al. (2005); Kaluđerović, Schmidt, Schwieger et al. (2007); Kaluđerović, Schmidt, Wagner et al. (2007). For related literature, see: Contreras et al. (2001); Hindmarsh et al. (1997); Hughes et al. (2001); Rostovtsev et al. (2002).
Data collection: IPDS Software (Stoe & Cie, 1999); cell refinement: IPDS Software; data reduction: IPDS Software; program(s) used to solve structure: SHELXS97 (Sheldrick, 1997); program(s) used to refine structure: SHELXL97 (Sheldrick, 1997); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: SHELXL97.
[PtBr2(CH3)2(C10H20N2O4)] | F(000) = 1168 |
Mr = 617.26 | Dx = 2.207 Mg m−3 |
Monoclinic, C2/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -C 2yc | Cell parameters from 8000 reflections |
a = 21.419 (4) Å | θ = 4.2–51.7° |
b = 8.1405 (12) Å | µ = 11.87 mm−1 |
c = 12.153 (2) Å | T = 220 K |
β = 118.75 (3)° | Block, yellow |
V = 1857.9 (6) Å3 | 0.25 × 0.22 × 0.18 mm |
Z = 4 |
Stoe IPDS diffractometer | 1754 independent reflections |
Radiation source: fine-focus sealed tube | 1644 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.088 |
area detector scans | θmax = 25.9°, θmin = 3.6° |
Absorption correction: numerical (IPDS Software; Stoe & Cie, 1999) | h = −26→26 |
Tmin = 0.086, Tmax = 0.186 | k = −9→9 |
5983 measured reflections | l = −14→14 |
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)] = 0.044 | H-atom parameters constrained |
wR(F2) = 0.116 | w = 1/[σ2(Fo2) + (0.0673P)2 + 23.535P] where P = (Fo2 + 2Fc2)/3 |
S = 1.05 | (Δ/σ)max < 0.001 |
1754 reflections | Δρmax = 3.61 e Å−3 |
98 parameters | Δρmin = −3.25 e Å−3 |
0 restraints | Extinction correction: SHELXL97, Fc*=kFc[1+0.001xFc2λ3/sin(2θ)]-1/4 |
Primary atom site location: structure-invariant direct methods | Extinction coefficient: 0.0019 (4) |
[PtBr2(CH3)2(C10H20N2O4)] | V = 1857.9 (6) Å3 |
Mr = 617.26 | Z = 4 |
Monoclinic, C2/c | Mo Kα radiation |
a = 21.419 (4) Å | µ = 11.87 mm−1 |
b = 8.1405 (12) Å | T = 220 K |
c = 12.153 (2) Å | 0.25 × 0.22 × 0.18 mm |
β = 118.75 (3)° |
Stoe IPDS diffractometer | 1754 independent reflections |
Absorption correction: numerical (IPDS Software; Stoe & Cie, 1999) | 1644 reflections with I > 2σ(I) |
Tmin = 0.086, Tmax = 0.186 | Rint = 0.088 |
5983 measured reflections |
R[F2 > 2σ(F2)] = 0.044 | 0 restraints |
wR(F2) = 0.116 | H-atom parameters constrained |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0673P)2 + 23.535P] where P = (Fo2 + 2Fc2)/3 |
1754 reflections | Δρmax = 3.61 e Å−3 |
98 parameters | Δρmin = −3.25 e Å−3 |
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 | ||
C1 | −0.5342 (5) | −0.3798 (9) | −0.8827 (8) | 0.0342 (17) | |
H2 | −0.4982 | −0.2945 | −0.8564 | 0.041* | |
H1 | −0.5782 | −0.3334 | −0.8921 | 0.041* | |
H3 | −0.5423 | −0.4251 | −0.9623 | 0.041* | |
C2 | −0.5342 (4) | −0.9177 (9) | −0.8120 (7) | 0.0253 (15) | |
H4 | −0.5372 | −1.0180 | −0.8589 | 0.030* | |
H5 | −0.5753 | −0.9149 | −0.7970 | 0.030* | |
C3 | −0.6049 (4) | −0.7510 (9) | −0.9974 (7) | 0.0277 (15) | |
H7 | −0.6055 | −0.6461 | −1.0376 | 0.033* | |
H8 | −0.6416 | −0.7462 | −0.9715 | 0.033* | |
C4 | −0.6227 (4) | −0.8873 (10) | −1.0917 (7) | 0.0281 (15) | |
C5 | −0.7193 (5) | −1.0109 (14) | −1.2714 (10) | 0.051 (3) | |
H10 | −0.7643 | −1.0599 | −1.2853 | 0.061* | |
H9 | −0.6848 | −1.0997 | −1.2529 | 0.061* | |
C6 | −0.7306 (8) | −0.9233 (19) | −1.3865 (12) | 0.079 (4) | |
H11 | −0.7488 | −0.9995 | −1.4565 | 0.095* | |
H12 | −0.6857 | −0.8779 | −1.3738 | 0.095* | |
H13 | −0.7646 | −0.8351 | −1.4046 | 0.095* | |
N | −0.5353 (3) | −0.7714 (7) | −0.8859 (5) | 0.0218 (12) | |
H6 | −0.5018 | −0.7864 | −0.9118 | 0.023* | |
O1 | −0.5801 (3) | −0.9721 (9) | −1.1044 (6) | 0.0436 (16) | |
O2 | −0.6931 (3) | −0.8978 (8) | −1.1645 (6) | 0.0406 (15) | |
Br | −0.61452 (5) | −0.56041 (10) | −0.75172 (9) | 0.0390 (3) | |
Pt | −0.5000 | −0.56242 (4) | −0.7500 | 0.02106 (19) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.055 (5) | 0.018 (4) | 0.027 (4) | −0.003 (3) | 0.018 (4) | 0.003 (3) |
C2 | 0.037 (4) | 0.022 (3) | 0.012 (3) | −0.005 (3) | 0.008 (3) | −0.001 (3) |
C3 | 0.033 (3) | 0.024 (3) | 0.020 (4) | 0.003 (3) | 0.008 (3) | −0.001 (3) |
C4 | 0.031 (3) | 0.027 (4) | 0.023 (4) | −0.002 (3) | 0.010 (3) | −0.001 (3) |
C5 | 0.034 (4) | 0.057 (6) | 0.052 (6) | −0.010 (4) | 0.012 (4) | −0.030 (5) |
C6 | 0.082 (8) | 0.102 (11) | 0.035 (7) | −0.002 (7) | 0.014 (6) | −0.019 (7) |
N | 0.033 (3) | 0.017 (3) | 0.015 (3) | 0.001 (2) | 0.012 (2) | 0.001 (2) |
O1 | 0.031 (3) | 0.060 (4) | 0.035 (4) | 0.005 (3) | 0.012 (3) | −0.020 (3) |
O2 | 0.029 (3) | 0.043 (3) | 0.039 (4) | −0.001 (2) | 0.008 (3) | −0.018 (3) |
Br | 0.0423 (5) | 0.0406 (5) | 0.0378 (5) | 0.0055 (3) | 0.0222 (4) | −0.0027 (3) |
Pt | 0.0311 (3) | 0.0134 (2) | 0.0187 (3) | 0.000 | 0.01205 (19) | 0.000 |
C1—Pt | 2.052 (8) | C5—O2 | 1.466 (11) |
C1—H2 | 0.9700 | C5—C6 | 1.483 (19) |
C1—H1 | 0.9700 | C5—H10 | 0.9800 |
C1—H3 | 0.9700 | C5—H9 | 0.9800 |
C2—N | 1.485 (9) | C6—H11 | 0.9700 |
C2—C2i | 1.515 (14) | C6—H12 | 0.9700 |
C2—H4 | 0.9800 | C6—H13 | 0.9700 |
C2—H5 | 0.9800 | N—Pt | 2.234 (6) |
C3—N | 1.464 (9) | N—H6 | 0.9200 |
C3—C4 | 1.506 (11) | Br—Pt | 2.4431 (10) |
C3—H7 | 0.9800 | Pt—C1i | 2.052 (8) |
C3—H8 | 0.9800 | Pt—Ni | 2.234 (6) |
C4—O1 | 1.213 (10) | Pt—Bri | 2.4431 (10) |
C4—O2 | 1.334 (9) | ||
Pt—C1—H2 | 109.5 | C5—C6—H12 | 109.5 |
Pt—C1—H1 | 109.5 | H11—C6—H12 | 109.5 |
H2—C1—H1 | 109.5 | C5—C6—H13 | 109.5 |
Pt—C1—H3 | 109.5 | H11—C6—H13 | 109.5 |
H2—C1—H3 | 109.5 | H12—C6—H13 | 109.5 |
H1—C1—H3 | 109.5 | C3—N—C2 | 111.3 (5) |
N—C2—C2i | 109.1 (5) | C3—N—Pt | 115.5 (4) |
N—C2—H4 | 109.9 | C2—N—Pt | 105.2 (4) |
C2i—C2—H4 | 109.9 | C3—N—H6 | 108.2 |
N—C2—H5 | 109.9 | C2—N—H6 | 108.2 |
C2i—C2—H5 | 109.9 | Pt—N—H6 | 108.2 |
H4—C2—H5 | 108.3 | C4—O2—C5 | 117.2 (6) |
N—C3—C4 | 113.2 (6) | C1i—Pt—C1 | 87.1 (5) |
N—C3—H7 | 108.9 | C1i—Pt—N | 176.8 (3) |
C4—C3—H7 | 108.9 | C1—Pt—N | 96.0 (3) |
N—C3—H8 | 108.9 | C1i—Pt—Ni | 96.0 (3) |
C4—C3—H8 | 108.9 | C1—Pt—Ni | 176.8 (3) |
H7—C3—H8 | 107.8 | N—Pt—Ni | 80.8 (3) |
O1—C4—O2 | 124.0 (7) | C1i—Pt—Br | 88.8 (2) |
O1—C4—C3 | 125.8 (7) | C1—Pt—Br | 90.7 (2) |
O2—C4—C3 | 110.2 (6) | N—Pt—Br | 91.01 (15) |
O2—C5—C6 | 110.7 (10) | Ni—Pt—Br | 89.58 (15) |
O2—C5—H10 | 109.5 | C1i—Pt—Bri | 90.7 (2) |
C6—C5—H10 | 109.5 | C1—Pt—Bri | 88.8 (2) |
O2—C5—H9 | 109.5 | N—Pt—Bri | 89.58 (15) |
C6—C5—H9 | 109.5 | Ni—Pt—Bri | 91.01 (15) |
H10—C5—H9 | 108.1 | Br—Pt—Bri | 179.23 (4) |
C5—C6—H11 | 109.5 | ||
N—C3—C4—O1 | −25.8 (12) | C3—N—Pt—C1 | −41.3 (5) |
N—C3—C4—O2 | 156.9 (7) | C2—N—Pt—C1 | −164.5 (5) |
C4—C3—N—C2 | −65.9 (8) | C3—N—Pt—Ni | 138.8 (6) |
C4—C3—N—Pt | 174.2 (5) | C2—N—Pt—Ni | 15.7 (3) |
C2i—C2—N—C3 | −170.9 (7) | C3—N—Pt—Br | 49.4 (5) |
C2i—C2—N—Pt | −45.2 (7) | C2—N—Pt—Br | −73.7 (4) |
O1—C4—O2—C5 | −4.6 (13) | C3—N—Pt—Bri | −130.1 (5) |
C3—C4—O2—C5 | 172.7 (8) | C2—N—Pt—Bri | 106.8 (4) |
C6—C5—O2—C4 | −93.6 (11) |
Symmetry code: (i) −x−1, y, −z−3/2. |
Experimental details
Crystal data | |
Chemical formula | [PtBr2(CH3)2(C10H20N2O4)] |
Mr | 617.26 |
Crystal system, space group | Monoclinic, C2/c |
Temperature (K) | 220 |
a, b, c (Å) | 21.419 (4), 8.1405 (12), 12.153 (2) |
β (°) | 118.75 (3) |
V (Å3) | 1857.9 (6) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 11.87 |
Crystal size (mm) | 0.25 × 0.22 × 0.18 |
Data collection | |
Diffractometer | Stoe IPDS |
Absorption correction | Numerical (IPDS Software; Stoe & Cie, 1999) |
Tmin, Tmax | 0.086, 0.186 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 5983, 1754, 1644 |
Rint | 0.088 |
(sin θ/λ)max (Å−1) | 0.615 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.044, 0.116, 1.05 |
No. of reflections | 1754 |
No. of parameters | 98 |
H-atom treatment | H-atom parameters constrained |
w = 1/[σ2(Fo2) + (0.0673P)2 + 23.535P] where P = (Fo2 + 2Fc2)/3 | |
Δρmax, Δρmin (e Å−3) | 3.61, −3.25 |
Computer programs: IPDS Software (Stoe & Cie, 1999), IPDS Software, SHELXS97 (Sheldrick, 1997), SHELXL97 (Sheldrick, 1997), ORTEP-3 (Farrugia, 1997), SHELXL97.
C1—Pt | 2.052 (8) | Br—Pt | 2.4431 (10) |
N—Pt | 2.234 (6) | ||
C1i—Pt—C1 | 87.1 (5) | N—Pt—Br | 91.01 (15) |
C1—Pt—N | 96.0 (3) | C1—Pt—Bri | 88.8 (2) |
C1—Pt—Ni | 176.8 (3) | N—Pt—Bri | 89.58 (15) |
N—Pt—Ni | 80.8 (3) | Br—Pt—Bri | 179.23 (4) |
C1—Pt—Br | 90.7 (2) |
Symmetry code: (i) −x−1, y, −z−3/2. |
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In this paper, we report the structure of trans,cis-dibromodimethyl(O,O'-diethyl-ethylenediamine- N,N'-diacetate)platinum(IV) (configuration index: OC-6–13) trans,cis-[PtBr2Me2(Et2edda)], prepared as part of our investigation on basic coordination modes and antitumoral activity of platinum(IV) complexes with esters of H2edda-type (ethylenediamine-N,N'-diacetatic acid) ligands (Kaluđerović, Đinović et al., 2005; Kaluđerović, Miljković et al., 2005; Kaluđerović, Schmidt, Schwieger et al., 2007).
The title compound crystallizes in the space group C2/c as isolated molecules and exhibits a crystallographically imposed C2 symmetry axis bisecting the C2—C2i bond and passing through the Pt atom. The Pt atom adopts a [Br2C2N2] distorted octahedral coordination; the Pt, C, N atoms lie in a plane with meaningless deviation from the mean plane: 0.004 (6) Å and 0.005 (9) Å for N and C1 atoms, respectively. Due to the C2 symmetry, the five-membered ring PtNC2C2iNi exibits an ideal half twisted conformation with a twist around the C2—C2i bond. Because of an inversion center within the unit cell the compound crystallized as a mixture of molecules with λ and δ oriented five-membered cycles in 1:1 ratio. Fig. 1 illustrates the λ oriented complex.
Almost all angles in the coordination polyhedron are very close to the ideal value of 90° (87.1 (5) - 91.0 (2)°), with the exception of angles N—Pt—Ni = 80.8 (3)° and C1—Pt—N = 96.0 (3)°, due to the constraints of the chelate binding Et2edda ligand. The angle N—Pt—Ni is smaller than in structures [PtCl4(R2edda)] (R = Me, 83.1 (6)°; Et, 84.0 (3)°, (I); Kaluđerović, Schmidt, Schwieger et al., 2007), [PtBr4(en)] (83.1 (9)°; Hindmarsh et al., 1997), [PdCl2(R4edta)] (R = Me, 85.9 (2)°; Et, 85.6 (3)°; Kaluđerović, Schmidt, Wagner et al., 2007) and in [PtMe2I2(tmeda)], (II), [PtMe2I(n-C3F7)(tmeda)], (III), and [PtMeI2(n-C3F7)(tmeda)], (IV), (tmeda = tetramethyl-N,N,N',N'-ethylenediamine; 82.3 (2) - 82.8 (5)°; Hughes et al., 2001).
The Pt—C1 bond length of 2.052 (8) Å is comparable to the Pt—C distances found in trans-[PtBr2Me2{o-Ph2P(S)C6H4SMe- κ2S,S}], 2.065 (6)/2.106 (5) Å (Contreras et al., 2001) and in [Pt(X)(OMe)(Me)2(tmeda)] structures (X = OH, OOH), 2.007 (8) - 2.07 (2) Å (Rostovtsev et al., 2002). The Pt—Br bond lengths (2.443 (1) Å) are similar to those found in (I) (2.447 (1)/2.460 (1) Å), [PtBr4(L)] (L = ethylenediamine, 2.461 (2)/2.448 (2) Å; 1,3-propylenediamine, 2.452 (4)/2.455 (4) Å; Hindmarsh et al., 1997). In accordance with the high trans influence of the Me ligand the Pt—N bond (2.234 (6) Å) is relatively long although comparable with structures (II), (III) and (IV) (2.226 (5) - 2.312 (7) Å; Hughes et al., 2001), in which the Me ligand is also trans to N atom. The Pt—N bonds with Cl ((I): 2.110 (6) Å) or Br ([PtBr4(L)]; L = ethylenediamine, 2.05 (2) Å; L = 1,3-propylenediamine, 2.04 (3) Å; Hindmarsh et al., 1997) trans to a N atom are shorter relative to corresponding bond length in the title compound. Weak intramolecular H-bond (C5—H···O1) may stabilize the structure (distance C5···O1 = 2.70 (1) Å).
Besides trans-[PtBr2Me2{o-Ph2P(S)C6H4SMe- κ2S,S}] (Contreras et al., 2001), the title complex is the only other mononuclear dibromodimethylplatinum(IV) complex that has been structurally characterized to date.