Electron Reactions and Exciplexes

Quenching of anthracene fluorescence by iodide ions involves electron transfer. One study of this process in ethanol/propanol solutions has employed a Marcus type theory whilst another using methanol/ethanol media selects the Onuchic equation to take account of both electron transfer and diffusion effects. Oxygen quenching of the fluorescence of anthracene derivatives under hydrostatic pressures up to 700 MPa gives an insight into the role of complex formation in the 

There have been two reviews of photoinduced electron transfer. The subject is dealt with generally in one whilst ultrafast photochemical charge transfer and excited state solvation are considered specifically in the other.  

Photoinduced electron transfer is a subject characterised, particularly at the present time, by papers with a strongly theoretical content. Solvent relaxation and electron back transfer following photoinduced electron transfer in an ensemble of randomly distributed donors and acceptors, germinate recombination and spatial diffusion a comparison of theoretical models for forward and back electron transfer, rate of translational modes on dynamic solvent effects, forward and reverse transfer in nonadiabatic systems, and a theory of photoinduced twisting dynamics in polar solvents has been applied to the archetypal dimethylaminobenzonitrile in propanol at low temperatures have all been subjects of very detailed study. The last system cited provides an extended model for dual fluorescence in which the effect of the time dependence of the solvent response is taken into account. The mechanism photochemical initiation of reactions involving electron transfer, with particular reference to biological systems, has been discussed by Cusanovich.  

A particularly interesting contribution to the study of electron transfer is described in the published version of a lecture by Verhoeven . This discusses electron transport through saturated hydrocarbon bridges and a resulting exciplex emission from flexible, rigid, and semiflexible bichromophoies. 

A considerable number of papers deal with the details of specific systems. Only a selection of these can be mentioned these are ground state anion formation and ps excitation dynamics of 3-hydroxyflavone in formamide styrylphenanthrene- 

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