Resonance Raman spectroscopy of matrix-isolated bis(.eta.6-arene)vanadium complexes

Abstract

V(η 6 -benzene) 2 and V(ν 6 -mesitylene) 2 , silated in nitrogen matrices at 12 K, exhibit long resonance Raman progressions when excited into their lowest energy charge-transfert (CT) bands. The principal progression-forming mode of the benzene complex is the ring-V-ring symmetric stretching mode. The frequency is increased on methylation of the ring by mixing with a low-frequency ligand mode. The transition involved in the resonance Raman spectra is identified as the 2 A 1g → 2 E 1u ligant-to-metal charge-transfer transition