Electronic structure of alkoxychromium(0) carbene complexes: a joint TD-DFT/experimental study.
The joint computational (TD-DFT) experimental study of the UV-vis spectroscopy of alkoxychromium(0) carbene complexes accurately assigns the vertical transitions responsible for the observed spectra of these compounds. Both the LF and the MLCT band have a remarkably pi-pi* character, which has been demonstrated by the strong dependence of the absorptions with the donor/acceptor nature of the substituent in p-substituted styrylchromium(0) carbene complexes. The effect of the substituent is also related with the equilibrium geometry of the complexes and the occupations of the p atomic orbital of the carbene carbon atom. Additionally, the ferrocenyl moiety behaves in chromium(0) (Fischer) carbene complexes as a pi-donor group.
Lage
Marta L
ML
Departamento de Química Orgánica, Facultad de Química, Universidad Complutense, Madrid, Spain.
Fernández
Israel
I
Mancheño
María J
MJ
Sierra
Miguel A
MA