The formation of mixed metal aminophosphinidene clusters via reactions of terminal chloroaminophosphido complexes with Co2(CO)8

Abstract

Reactions of terminal chloroaminophosphido complexes with Co2(CO)8 have been examined. The ruthenium phosphido complexes [Cp*Ru(CO)2{P(Cl)TMP}] (1a) and [CpRu(CO)2{P(Cl)TMP}] (1b) (TMP = 2,2,6,6-tetramethylpiperidinyl) react with Co2(CO)8 to form the cobalt cluster [Co4(CO)7(µ-CO)3{µ3-P(TMP)}] (2) with complete transfer of the phosphinidene unit to cobalt. In contrast, the phosphido complex [Cp*Ru(CO)2{P(Cl)N-i-Pr2}] (1c) affords the spiked-triangular cluster [Cp*RuCo3(CO)8(µ-CO)2(µ3-PN-i-Pr2)] (3), which retains the Cp*Ru unit upon reaction with Co2(CO)8. The molybdenum phosphido complex [CpMo(CO)2{P(Cl)TMP}] (4) reacts with Co2(CO)8 to form cluster 2, while [Cp*Mo(CO)3{P(Cl)N-i-Pr2}] (5) generates the mixed metal tetrahedral cluster [Cp*MoCo3(CO)5(µ-CO)4(µ3-PN-i-Pr2)] (6). Key words: phosphido, phosphinidene, cobalt, ruthenium, molybdenum, cluster.