Reactions of [Mn-2(mu-pyS)(2)(CO)(6)] (pySH= pyridine-2-thiol) with triphenylphosphine (PPh3), diphenylphosphine (PHPh2) and bis(diphenylphosphino)methane (dppm): X-ray crystal structure of [Mn(pyS)(eta(1)-dppm)(2)(CO)(2)]

The dimeric complex [Mn-2(mu-pyS)(2)(CO)(6)] (1) reacted with 2 M equivalen ts of both PPh3 and PHPh2 to give the respective monomeric phosphine comple xes [Mn(pyS)(L)(CO)(3)][L = PPh3 (2) and PHPh2 (3)]; with 4 M equivalents o f dppm, it yielded the complex [Mn(pyS)(eta(1)-dppm)(2)(CO)(2)] (4). An X-r ay structure determination of 4 shows that it crystallizes in the monoclini c space group P2(1)/n with a = 11.027(3), b = 24.984(7), c = 18.379(5) Angs trom, beta = 99.870(8)degrees, V = 4988(2) Angstrom(3), and Z = 4. The comp lex has an octahedral geometry with the chelating pyS ligand and two CO gro ups occupying the equatorial sites and the two monodentate dppm ligands lyi ng in the trans positions.