Oxorhenium mixed-ligand complexes with the 2,6-dimercaptomethylpyridine ligand. Crystal structure of [2,6-dimercaptomethylpyridinato][p-methoxy-benzenethiolato]oxorhenium(V)

Two novel oxorhenium complexes containing the 2,6-dimercaptomethylpyridine ligand were synthesized and characterized by classical methods of analysis. The [2,6-dimercaptomethylpyridinato] [p-methoxybenzenethiolato]oxohenium c omplex ,1 was produced by simultaneous action of equimolar quantities of 2, 6-dimercaptomethylpyridine and p-methoxybenzenethiol on the precursor [(n-C 4H9)(4)N][ReOCl4] in EtOH. As revealed by spectroscopic data as well as X-r ay structure analysis, complex 1 adopts a distorted square pyramidal geomet ry around the metal with the SNS/S donors forming the basal plane and the o xygen occupying the apex of the pyramid. When the same tridentate ligand re acts with [(n-C4H9)(4)N][ReOCl3(PO)] (PO = o-diphenylphosphinophenolato) as a precursor, complex 2a, [2,6-dimercaptomethylpyridinato][o-diphenylphosph inophenolato]-ox-orhenium, is obtained. The latter is a six-coordinate rhen ium species to which the distorted octahedral geometry is assigned, accordi ng to the analytical findings. In this case, the SNS/P donors occupy the eq uatorial plane and the two oxygen atoms the apices of the distorted octahed ron positioned trans to each other. (C) 2000 Elsevier Science S.A. All righ ts reserved.