Assigning Reactive Excited States in Inorganic Photochemistry.
UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF CHEMISTRY
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We are seeing currently the development of an extended research field for that special breed of physical inorganic chemist, the excited state kineticist. Studies of excited state rate processes are an increasingly important adjunct to conventional quantum yield and product characterizations. Increasingly complex and intimate excited state reaction schemes are being constructed. The identification of the reactant species, ordinarily obvious in thermal reactions, turns out not to be so obvious in excited state chemistry. We limit ourselves here to three examples, involving transition metal complexes in solution. The general picture, and some vocabulary should be presented first. In the case of mononuclear complexes having monodentate or simple bidentate ligands, to which this discussion will be confined, the visible-uv absorption spectra show two principal types of transitions, ligand field, LF, and charge transfer, CT. They may be several LF absorptions, and we designate these as L1, L2, etc., with a left superscript to indicate the spin multiplicity of the terminal state.
- Physical Chemistry