摘要：

The spectra and structures of cobalt hydrocarbonyl, dicobalt octacarbonyl, cobalt carbonyl anion and tetracobalt dodecacarbonyl have been studied. The hydrogen of cobalt hydrocarbonyl is very weakly bound to the rest of the molecule, as shown by infrared spectra and nuclear magnetic resonance studies. The infrared spectrum of cobalt carbonyl anion indicates that the structure is tetrahedral; an explanation is given for the considerable long wave length shift of the carbonyl frequency. From the spectra of dicobalt octacarbonyl the structure proposed is a trans configuration of two trigonal bipyramids joined at the edge such that apical and equatorial carbonyls are shared as bridge carbonyls. The infrared spectrum of tetracobalt dodecacarbonyl is somewhat simpler than that of dicobalt octacarbonyl; the spectrum indicates a structure which also contains bridge carbonyls.

展开