Spectroscopy and Photochemistry of Ni(CO)2(α-Diimine) Complexes
During the last ten years much attention has been paid in our laboratory to the spectroscopy, photochemistry and in some cases photophysics of low-valence transition metal α-diimine complexes. For most of these complexes the lowest excited state is metal to α-diimine charge transfer (MLCT) in character. Only in a few cases, viz. d6-M(CO)4 (α-diimine) (M=Cr,Mo,W) (Balk 1980; van Dijk 1985) and recently d8 -Fe(CO)3(α-diimine) (van Dijk, to be published; Kokkes 1984), a reaction was observed from these MLCT states, although the quantum yields of these reactions were always very low (φ<0.01). Because of these low quantum yields and because of the presence of close-lying reactive LF states, photochemical reactions normally occur from these latter states, especially at room temperature when these LF states become thermally occupied.
KeywordsLower Excited State Resonance Raman Spectrum Photochemical Behaviour MLCT Transition MLCT State
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