29Si NMR spectra of metal carbonyl silanes by the selective population transfer method

Abstract

Utilization of the novel Selective Population Transfer (SPT) technique for the first NMR observation of 29Si nuclei directly bound to transition metals is reported. Four metal carbonyl trimethylsilanes ((CH 3) 3SiMn(CO) 5, (CH 3) 3SiRe(CO) 5, (CH 3) 3SiCo(CO) 4, and (CH 3) 3SiFe(CO) 2(C 5H 5)) have been studied and their chemical shifts and coupling constants obtained. These data are compared with existing 29Si NMR spectra of more conventional (CH 3) 3SiX compounds and 119Sn NMR spectra of homologous (CH 3) 3Snmetal complexes.