Synthesis of new silyl-substituted triosmium clusters. The reactivity of the anion [Os3(CO)11{Si(OEt)3}]– towards Group 1B and 2B metals

Abstract

Silyl-substituted triosmium clusters of general formula [Os₃H(CO)₁₁(SiR₃)](1) or [Os₃H(CO)₁₀(MeCN)(SiR₃)](2)[R₃=(OMe)₃, (OEt)₃, Et₃, or HPh₂] can be synthesized from the reaction of the silane derivatives SiHR₃ with the activated clusters [Os₃(CO)₁₁(MeCN)] and [Os₃(CO)₁₀(MeCN)₂], respectively. The complex [Os₃H(CO)₁₁{Si(OEt)₃}] is easily deprotonated by triethylamine affording the highly reactive anion [Os₃(CO)₁₁{Si(OEt)₃}]^– which has been isolated as the salt [NHEt₃][Os₃(CO)₁₁{Si(OEt)}₃](3b). A study of the reactivity of (3b) towards Group 1B and 2B metal ions has been undertaken and the reaction products characterized on the basis of their spectroscopic properties.