Dimethyl sulfoxide complexes

C9HnBrN206 C2H6OS 5-Bromouridine - dimethyl sulfoxide complex BURDMS 31 369... 

The unit cell is tetragonal, with a symmetry approximating P2i2 2i. The cell dimensions are a = b= 18.87 A (1.887 nm) and c = 7.99 A (799 pm). The helix diameter is 13.3 A (1.33 nm). One ethylenediamine molecule for every two D-glucose residues is indicated. The location of the ethylenediamine molecule in the lattice was discussed. The structure is almost identical to that of the amy-lose-dimethyl sulfoxide complex. 

Crystallographic studies on S-dimethyl sulfoxide complexes (Table III) show that the geometry of the Me2SO moiety is virtually unaffected by coordination. Values of O—C of —107° compare favorably with the values of 106.7° and 106.8° reported for free dimethyl sulfoxide. Similarly, reported values of C—C between 99.4(6)° and 104.5(7)° compare with the value of 97.4° reported for the free molecule. A slight increase in C— —C would be expected on repulsion... 

The kinetics and mechanism of ligand substitution reactions of square-planar platinum(II) dimethyl sulfoxide complexes have been exhaustively studied (173), and these workers conclude that the cis and trans influences and the trans effects of Me2SO and ethylene are similar in magnitude whereas the cis effect of Me2SO is about 100 times as large as that of ethylene. The results for reaction (5), where the stability constants, Kt, are reported to be 1.5 x 108 (L = S-Me2SO) and 4.5 x 108 (L = ethylene) corroborate this analogy (213). 

The use of palladium(II) sulfoxide complexes as catalyst precursors for polymerization has met with mixed results thus a report of a palla-dium(II) chloride-dimethyl sulfoxide system as a catalyst precursor for phenylacetylene polymerization suggests similar results to those obtained using tin chloride as catalyst precursor (421). However, addition of dimethyl sulfoxide to solutions of [NH fPdCh] decreases the activity as a catalyst precursor for the polymerization of butadiene (100). Dimethyl sulfoxide complexes of iron have also been mentioned as catalyst precursors for styrene polymerization (141). 

CopperdI) dimethyl sulfoxide complexes [Cu(Me2SO)n]2+ n = 4 (309, 391) n = 5 (496) n = 9 (221)] have been synthesized and assigned as O-bonded by spectroscopic study. The Ph2SO complex [Cu(Ph2SO)4]2+ (228) has been prepared and isolated as its perchlorate salt. Preliminary crystallographic data (320) and ESR data (483) are available which suggest D4h symmetry for the metal-ion site. 

Dimethyl sulfoxide complexes of the lanthanide bromides [M(Me2SO)gBr2][Br] have been isolated (480), which are 1 1 electrolytes in acetonitrile solution, indicating a coordination number of ten. 

Smith MK, Gibson JA, Young CG, Broomhead JA, Junk PC, Keene FR. Photoinduced ligand isomerization in dimethyl sulfoxide complexes of ruthenium(II). Eur J Inorg Chem 2000 1365-70. 

Adams, B., Smith, A. T., Bailey, S., McEwan, A. G., and Bray, R. C., 1999, Reactions of dimethyl-sulfoxide reductase from Rhodobacter capsulatus with dimethylsulfide and with dimethyl-sulfoxide complexities revealed by conventional and stopped-flow spectrophotometry. 

C12H10Cl2O8Te Telluran(IV) Diperchloryloxy-diphenyl (Dimethyl Sulfoxide Complex) EI2b, 619 (Cl - O-CIO3)... 

Diphenyl Tellurium Diperchlorate/Dimethyl Sulfoxide Complex A mixture of 0.70 g (2 mmol) diphenyl tellurium dichloride, 0.83 g (4 mmol) silver perchlorate and 30 ml dichloromethane is stirred at 20° for 1 h. The precipitated silver chloride is removed by filtration. The filtrate is mixed with a solution of 0.15 g (2 mmol) dimethyl sulfoxide in 10 ml dichloromethane. The mixture is refluxed for 5 h. The solvent is distilled from the mixture. The residue is treated with petroleum ether (40-60°). The resulting white solid is recrystallized from petroleum ether (40-60°)/dichloromethane (3 1) and then dried under reduced pressure 95% yield m.p. 140°. 

Fig. 10. N-ENDOR spectra at 10 K of mixed-valent MMOH (resting and dimethyl-sulfoxide complex) and Hr (sulfide complex). Resting MMOH in 0.1 M MOPS pH 7.0, cw ENDOR spectra obtained atgi = 1.94. Dimethylsulfoxide (0.3 M) complexed MMOH at 0.1 M MOPS pH 6.5, cw ENDOR spectra obtained at gi = 1.94. Hr sulfide complex at pH 8, cw ENDOR spectra obtained at gi = 1.88. The bars labeled Fe(III)-N mark the resonances for nitrogen coordinated to FefllD. The resonances at low frequency observed in absence of dimethylsulfoxide are from the nitrogen coordinated to Fe(II). Adapted from (237).

Reports of nickel(II) dimethyl sulfoxide complexes are extremely numerous the species [NiCMejSOlelpCi [X = BF4 (362, 363) X = NO3 (405) [XJa = [NiCU] (162,238)] have been isolated, and H-NMR studies (462) and MCD studies (264) have appeared. In addition, [NiCMejSOlgJCXJg complexes have been isolated [X = Cl, CIO4, NO3 (221, 223)] which undergo thermal degradation via [NiCMejSOlsCl ] (which is probably [NKMejSOleJP iCU] in reality) to [Ni(MejSO)Clj]. 

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