THE SYNTHESIS OF RUBR2(DMSO)3 REVISITED - A MIXTURE OF LI[FAC-RUCLNBR3-N(DMSO)3] ISOMERS (N=0-3) IS THE REACTION-PRODUCT

In this paper we report the correct formulation of a ruthenium(II)-dimethyl sulfoxide complex previously reported in the literature as RuBr2(DMSO)3. By repeating the published synthetic procedure we isolated a product that has been unambiguously characterized as a mixture of Li[fac-RuClnBr3-n(DMSO)3] (n = 0-3) isomers. Our proposal is supported by detailed H-1 NMR spectroscopic studies, as well as by Li-7 and Cl-37 NMR spectra. We also report the crystal structure of [NEt4][fac-RuBr3(DMSO)3].0.5MeOH as determined by three dimensional X-rav analysis. Crystal data: a = 10.96(1), b = 14.30(1), c = 18.25(1) angstrom; beta = 106.0(1)-degrees, space group P2(1)/c, Z = 4. Least-squares refinement based on 1470 reflections converged to R = 0.113.