The synthesis of heteronuclear transition metal clusters derived from alkylidyne tricobalt cluster precursors: I. The reaction of (μ 3-CCl)Co 3(CO) 9 with transition metal carbonyl anions. The crystal and molecular structure of (μ 3-CCl)Co 2Mo(CO) 8(η 5-C 5H 5)

Abstract

Metal exchange reactions were used to produce heterometallic clusters derived from alkylidyne tricobalt precursors. Reaction of the cluster (μ 3-CCl)Co 3(CO) 9 with the potassium salt of (η 5-C 5H 5)Mo(CO) 3 − produced (μ 3-CH)CoMo 2(η 5-C 5H 5) 2(CO) 7, and (μ 3-CH)Co 2Mo(η 5-C 5H 5)(CO) 8 in an overall yield of 35%. The use of the bis(triphenylphosphine)iminium cation as the counterion leads, after work-up, to products with the reactive apical group intact. The structure of (μ 3-CCl)Co 2Mo(η 5-C 5H 5)(CO) 8, ( 1), has been determined. Use of (η 5-C 5H 5)Cr(CO) 3 − or (η 5-C 5H 5)W(CO) 3 − also gives substituted products, but in lower yields. The Mn(CO) 5 − anion effects reduction of the starting cluster rather than yielding substituted products.