Some complexes containing Pt-C5-Co3 fragments: Molecular structure of trans-Pt{Ctriple bond; length of mdashCCtriple bond; length of mdashC-μ3-C[Co3(μ-dppm)(CO)6(PPh3)]}2(PPh3)2 determined using synchrotron radiation

Reactions of platinum(II) chloro-phosphine complexes with Co3(μ3-CCtriple bond; length of mdashCCtriple bond; length of mdashCSiMe3)(μ-dppm)(CO)7 in the presence of NaOMe have given the compounds Pt{Ctriple bond; length of mdashCCtriple bond; length of mdashC-μ3-C[Co3(μ-dppm)(CO)7]}2(dppe) (1), trans-Pt{Ctriple bond; length of mdashCCtriple bond; length of mdashC-μ3-C[Co3(μ-dppm)(CO)7]}2(PEt3)2 (2) and trans-Pt{Ctriple bond; length of mdashCCtriple bond; length of mdashC-μ3-C[Co3(μ-dppm) (CO)6(PPh3)]}2(PPh3)2 (3), each of which contains two Co3 clusters linked by C5 chains to the Pt centre. Electrochemical studies (CVs) show the presence of both oxidation and reduction processes, the latter probably occurring on the CCo3 cores. Ready reductive elimination of {Co3(μ-dppm)(CO)7}2(μ3:μ3-C10) occurs from 1 upon heating. The X-ray study of 3 was carried out using synchrotron radiation (Advanced Photon Source, Argonne, IL) to confirm its structure.