Preparation and Molecular Structure of Os3(µ3-Me3SiC2C≡CSiMe3)(µ-OMe)2(CO)9

Abstract

The crystal and molecular structures of Os₃(µ₃-Me₃SiC₂C≡CSiMe₃)(µ-OMe)₂(CO)₉, obtained serendipitously from a reaction between complex Os₃(µ₃-Me₃SiC₂C≡CSiMe₃)(µ-CO)(CO)₉ and OsBr(PPh₃)₂Cp, are reported. The Os₃ cluster core has opened as a result of one CO ligand being replaced by two OMe groups to form a 52-electron complex with only one Os–Os bond. The two non-bonded Os–Os vectors are each bridged by an OMe group, while the geometry of the C₂Os₃ fragment is little changed from that found in Os₃ (₃-PhC₂C≡CPh)(-CO)(CO)₉.

Manuscript received: 26 March 2001.