Croatica Chemica Acta, Vol. 59 No. 4, 1986.
Original scientific paper
Substituent Effect on the Association Equilibria of Free Radical Anions. Electrochemical Reduction of p-Substituted Nitrobenzenes in N,N-Dimethylformamide
Barbara Kwiatek
; Department of Chemistry, University of Warsaw, 1 Pusteur St. 02-093 Warszawa, Poland
Marek K. Kalinowski
; Department of Chemistry, University of Warsaw, 1 Pusteur St. 02-093 Warszawa, Poland
Abstract
Association constants between p-substituted nitrobenzene anion radicals, formed by reduction of the parent molecules at a dropping mercuryelectrode, and tetraethylammonium cation in
N,N-dimethylformamide have been determined by studying the
variation in the half-wave potential with solution composition.
The association constant was observed to depend on the substituent
effect; it was shown that the Hammett equation in the form log K" = - 1.550 + 2.77 is fulfilled.The dependence of logK" vs. the hyperfine splitting constant (from ESR spectra) proper for N-nuclei in nitro-group of radical anions is also discussed.
Keywords
Hrčak ID:
177275
URI
Publication date:
5.11.1986.
Visits: 748 *