X-Ray crystal and molecular structures of three methinyl tricobalt enneacarbonyl derivatives

Abstract

Crystal structures have been determined of three derivatives of YCCo₃(CO)₉, all containing the tetrahedral CCo₃ cluster of the parent compound: in PhCCo₃(CO)₆·π-C₆H₃Me₃ a mesitylene molecule is π-bonded to a single Co atom of the Co₃ triangle, having replaced three CO groups; in PhCCo₃(CO)₆·π-C₈H₈, a cyclo-octatetraene molecule has replaced the three axial CO groups of the parent molecule and is π-bonded to the Co₃ triangle through three of its double bonds, and in the dimer, [CCo₃(CO)₉]₂ the length of the central formally single C–C bond is 1.37(2)Å.