Journal
POLYHEDRON
Volume 27, Issue 5, Pages 1471-1478Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2008.01.006
Keywords
electrochemistry; spectroelectrochemistry; pulse radiolysis; rhenium; flash photolysis
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The UV-Vis absorption spectra of 4-dimethylaminobenzyl radical cation (DMAB(center dot+)) and 1,10-phenanthroline radical anion (phen(center dot-)) were obtained by spectroelectrochemistry, flash photolysis and pulse radiolysis experiments on DMAB-CO2-Re-I(CO)(3)(phen) and DMAB-COOH. DMAB-CO2-Re-I(CO)(3)(phen) was shown to have remarkable reversibly/stable redox processes under electrochemical perturbations. An excellent agreement was observed between the spectrum of the radical cation DMAB(center dot+) obtained electrochemically and radiolytically. The in situ UV-Vis spectrum of the electrochemically reduced radical anions, phen(center dot-), was compared with that obtained from the products of the reductive quenching of the corresponding photochemically excited states. Besides, the oxidative quenching of the Re-I complex excited states by [Ni-II(Me-6[14]-aneN(4))] showed the formation of [(DMAB(center dot+)-CO2)-Re-I(CO)(3)(phen)] as the main primary product. (C) 2008 Elsevier Ltd. All rights reserved.
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