The Raman spectrum of [(C5H5)Fe(CO)]4: a Resonance Effect

Abstract

The deep-green colour of [(C₅H₅)Fe(CO)]₄ suppresses Raman scattering with available light sources, but an intense polarized band has been observed at 214 cm^–1, and is attributed to the symmetric Fe–Fe stretching mode, enhanced by a resonance Raman effect: the Fe–Fe force constant is estimated at 1·3 mdyn/Å.