On the nature of the redox products of 4-((CH₃)₂N)C₆H₄-CO₂^- and 4-((CH₃)₂N)C₆H₄-CO₂-Re(CO)₃(1,10-phenanthroline): A spectroelectrochemical, pulse radiolysis and flash photochemical study

Juliarena, M.P., Lezna, R.O., Ruiz, G.T., Feliz, M.R., Ferraudi, G.J., and Wolcan, E..

Polyhedron 27(5), 1471-1478 (2008)

NDRL 4710

The UV-Vis absorption spectra of 4-dimethylaminobenzyl radical cation (DMAB^•+) and 1,10-phenanthroline radical anion (pheno^•-) were obtained by spectroelectrochemistry, flash photolysis and pulse radiolysis experiments on DMAB-CO₂-Re^I(CO)₃(phen) and DMAB-COOH. DMAB-CO₂-ReI(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^•+ obtained electrochemically and radiolytically. The in situ UV-Vis spectrum of the electrochemically reduced radical anions, pheno?, was compared with that obtained from the products of the reductive quenching of the corresponding photochemically excited states. Besides, the oxidative quenching of the ReI complex excited states by [Ni^II(Me₆[14]-aneN₄)] showed the formation of [(DMAB^•+-CO2)-Re^I(CO)₃(phen)] as the main primary product.