ION-PAIRS FROM ELECTRON-DONOR ACCEPTOR SYSTEMS - A COMPARISON BETWEEN PICOSECOND AND CIDNP STUDIES
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Electron donor-acceptor (EDA) interactions play an important role in many biological, chemical, and physical processes. To gain insight into the principal reaction intermediates and the mechanisms of product formation, a series of model reactions were studied. For example, the photoreactions of an electron donor-acceptor complex between 1,1-dimethylindene (DMI) and tetracyanoethylene (TCNE) and a donor acceptor pair, DMI/chloranil (CA), have been studied by picosecond and CIDNP spectroscopy. It was found that immediately after excitation of the EDA complex the corresponding ion radicals, DMI+ and TCNE-, are generated and decay within 50 ps. The decay of these transients is followed by a bleaching of the EDA complex which persists for 500 ps. The nature of this process is discussed. In contrast, the irradiation of the system DMI/CA at 532 nm gives rise to excited singlet CA, which undergoes rapid intersystem crossing to the triplet state, before it is quenched by electron transfer. The resulting ion radical pair, DMI+/CA-, reacts by reverse electron transfer and by coupling to form two adducts. Adduct B is formed first, but is later depleted in favor of adduct A. (Chemical Equation Presented) 1985 American Chemical Society.
JOURNAL OF PHYSICAL CHEMISTRY
author list (cited authors)
RENTZEPIS, P. M., STEYERT, D. W., ROTH, H. D., & ABELT, C. J.
complete list of authors
RENTZEPIS, PM||STEYERT, DW||ROTH, HD||ABELT, CJ