Electronic Transitions in Metallocenes by Resonance Raman Scattering. II.*) The Low‐Energy Visible Spectrum of Nickelocene

Abstract

AbstractThe resonance Raman spectra of nickelocene, dissolved in benzene and cyclohexane solutions, have been studied in the excitation range 15000–19000 wavenumbers. Excitation profiles and depolarization dispersion curves have been obtained for two totally‐symmetric motions, corresponding to the Ni‐Cp stretching and the ring‐breathing vibrations.The experimental data have been interpreted in terms of resonating processes of the Franck‐Condon type, and opportune fitting of the experimental excitation profiles and depolarization data has been done, in the framework of this approach, by numerical calculations. The results of our modelling show that the interpretation of the low‐energy electronic absorption spectrum of nickelocene is slightly different from that of the ferrocene molecule, previously studied in our laboratory.