Infrared spectra and structures of cyclopentadienyl-carbon monoxide compounds of V, Mn, Fe, Co, Mo, and W

Abstract

The infrared absorption spectra in the CO stretching region of mono- and binuclear transition metal cyclopentadienyl-carbon monoxide compounds are presented. The structures of the molecules are discussed and it is shown that the spectra may be interpreted by consideration of the local symmetry of the carbon monoxide groups only. For the binuclear molybdenum and tungsten compounds the spectra are best explained by puckered five- and six-membered cyclic carbon monoxide systems, respectively. For the iron compound a single bridging carbon monoxide group is postulated. The compounds studied are C 5H 5V(CO) 4, C 5H 5Mn(CO) 3, C 5H 5Co(CO) 2, C 5H 5Mo(CO) 5MoC 5H 5, C 5H 5W(CO) 6WC 5H 5, and (C 5H 5Fe) 2(CO) 4.