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Some complexes containing carbon chains end-capped by M(CO)2Tp′ [M = Mo, W; Tp′ = HB(pz)3, HB(dmpz)3] groups
Authors:Michael I Bruce  Marcus L Cole  Brian W Skelton
Institution:a Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
b Chemistry M313, SBBCS, University of Western Australia, Crawley, WA 6009, Australia
Abstract:Complexes M(triple bond; length of mdashCCtriple bond; length of mdashCSiMe3)(CO)2Tp′ (Tp′ = Tp HB(pz)3], M = Mo 2, W 4; Tp′ = Tp HB(dmpz)3], M = Mo 3) are obtained from M(triple bond; length of mdashCCtriple bond; length of mdashCSiMe3)(O2CCF3)(CO)2(tmeda) (1) and KTp′].Reactions of 2 or 4 with AuCl(PPh3)/K2CO3 in MeOH afforded M{triple bond; length of mdashCCtriple bond; length of mdashCAu(PPh3)}(CO)2Tp′ (M = Mo 5, W 6) containing C3 chains linking the Group 6 metal and gold centres.In turn, the gold complexes react with Co33-CBr)(μ-dppm)(CO)7 to give the C4-bridged {Tp(OC)2M}triple bond; length of mdashCCtriple bond; length of mdashCCtriple bond; length of mdash{Co3(μ-dppm)(CO)7} (M = Mo 7, W 8), while Mo(triple bond; length of mdashCBr)(CO)2Tp and Co33-C(Ctriple bond; length of mdashC)2Au(PPh3)}(μ-dppm)(CO)7 give {Tp(OC)2Mo}triple bond; length of mdashC(Ctriple bond; length of mdashC)2Ctriple bond; length of mdash{Co3(μ-dppm)(CO)7} (9) via a phosphine-gold(I) halide elimination reaction. The C3 complexes Tp′(OC)2Mtriple bond; length of mdashCCtriple bond; length of mdashCRu(dppe)Cp (Tp′ = Tp, M = Mo 10, W 11; Tp′ = Tp, M = Mo 12) were obtained from 2-4 and RuCl(dppe)Cp via KF-induced metalla-desilylation reactions. Reactions between Mo(triple bond; length of mdashCBr)(CO)2Tp and Ru{(Ctriple bond; length of mdashC)nAu(PPh3)}(dppe)Cp (n = 2, 3) afforded {Tp(OC)2Mo}triple bond; length of mdashC(Ctriple bond; length of mdashC)n{Ru(dppe)Cp} (n = 2 13, 3 14), containing C5 and C7 chains, respectively. Single-crystal X-ray structure determinations of 1, 2, 7, 8, 9 and 12 are reported.
Keywords:Carbon chain  X-ray structures  Molybdenum  Tungsten  Gold  Ruthenium  Cobalt  Cluster
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