Reactivity of [Os3(CO)10(NCMe)2] and [Os3(CO)10(μ-Cl)(μ-AuPPh3)] with 4-mercaptopyridine:: X-ray structure of [Os3(CO)10(μ-H)(μ-SC5H4N)] and [Os3(CO)10(μ-AuPPh3)(μ-SC5H4N)]

The compound [Os-3(CO)(10)(mu-Cl)(mu-AuPPh3)](2) was prepared from the reaction between [Os-3(CO)(10)(NCMe)(2)] (1) and [AuClPPh3] under mild conditions. The reaction of 2 with 4-mercaptopyridine (4-pyS) ligand yielded compounds [Os-3(CO)(10)(mu-H)(mu-SC5H4N)] (4), formed by isolobal replacement of the fragment [AuPPh3](+) by H+ and [Os-3(CO)(10)(mu-AuPPh3)(mu-SC5H4N)] (5). [Os-3(CO)(10)(mu-H)(mu-SC5H4N)] (4) was also obtained by substitution of two acetonitrile ligands in the activated cluster 1 by 4-pyS, at room temperature in dichloromethane. Compounds 2-5 were characterized spectroscopically and the molecular structures of 4 and 5 in the solid state were obtained by single crystal X-ray diffraction studies. (c) 2007 Elsevier B.V. All rights reserved.