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.
KeywordsNickel Chromium Benzene Toluene Tungsten
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