Detection and assignment of different electronic transitions within the first CT band of M(CO) 4L (M = Cr, Mo, W; L 1,4-diazabutadiene (DAB) and pyridine-2-carbaldehydeirnine (PyCa)) with the use of resonance raman and MCD spectra

Abstract

The magnetic circular dichroism (MCD) together with the electronic absorption spectra of Mo(CO) 4)-pyridine-2-carbaldehyde-(N-phenyi-imine revealed that the first Mo to L CT band consists of different electronic transitions which could be asssigned with the help of resonance Raman spectra. The excited states of M(CO) 4-2L(PR 3 x) complexes (M = Cr, Mo, W; x= 0, 1; L = 1,4-diazabutadiene and pyridine-2-carbaldehyde-(R 1)-imine, R 1 = i-prop, phenyl; R - phenyl and n-butyl are investigated with the resonance Ratnan effect and interpreted with the help of electronic absorption spectra and CNDO/S calculations. The resonance Raman spectra gave detailed information about the properties of the excited states of the various complexes.