Chemistry of polynuclear metal complexes with bridging carbene or carbyne ligands. Part 60. Di- and tri-metal compounds prepared from the metal alkylidyne complexes [W(CR)(CO)2(η-C5Me5)](R = Me or C6H4Me-4) and [M(CR)(CO)2{HB(pz)3}][M = Mo, R = C6H4Me-4; M = W, R = Me; HB(pz)3= hydrotris(pyrazol-1-yl)borate]

Abstract

The metal alkylidyne complexes [Cr(CC₆H₄Me-4)(CO)₂(η-C₅H₅)], [W(CMe)(CO)₂(η-C₅Me₅)], and [M(CC₆H₄Me-4)(CO)₂{HB(pz)₃}][M = Cr or Mo, HB(pz)₃= hydrotris(pyrazol-1-yl)borate] have been prepared. These species, and the previously reported compounds [W(CR)(CO)₂L][R = Me, L = HB(pz)₃; R = C₆H₄Me-4, L =η-C₅Me₅], have been used to synthesise several di- and tri-metal complexes, including [MCo₂(µ₃-CR)(CO)₈L](M = Cr, R = C₆H₄Me-4, L =η-C₅H₅; M = W, R = Me, L =η-C₅Me₅), [FeMo(µ-CC₆H₄Me-4)(CO)_n{HB(pz)₃}](n= 5 or 6), [RhW(µ-CMe)(CO)₃(η-C₅Me₅)(η⁵-C₉H₇)], [Rh₂W(µ₃-CMe)(µ-CO)(CO)₂(η-C₅Me₅)₃], [Mo₂W(µ₃-CMe)(CO)₆(η-C₅H₅)₂{HB(pz)₃}], and [MW₂(µ-CR)₂(µ-CO)₂(CO)₄L₂][M = Mo, R = Me, L = HB(pz)₃; M = Mo or W, R = C₆H₄Me-4, L =η-C₅Me₅]. Spectroscopic data for the new compounds and some reactions are reported and discussed.