Add time:07/29/2019         Source:sciencedirect.com

Far-infrared spectra of 1,3-butadieneiron tricarbonyl, C4H6Fe(CO)3, cyclopentadienyl-manganese tricarbonyl, C5HMn(CO)3 and methylcyclopentadienylmanganese tricarbonyl, CH3C5H4Mn(CO)3 in the vapour phase have been reported first time in the region 500-10 cm−1. An assignment of the frequencies on the basis of local symmetry of Fe(CO)3 fragment explain most of the observations, but the FeCO stretching modes of E symmetry are split. The C4H6 vibrations are assigned on the basis of CS symmetry. For CpMn(CO)3 and MeCpMn(CO)3 particular reference is made to the assignment of the metal-ring modes. This assignment has been discussed in term of previous assignment given for (in liquid phase and Nujoll mull) other ν-cyclopentadienyl and related compounds, including ferrocene, dimethylferrocene, benzenechromium tricarbonyl and toluenechromium tricarbonyl.

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