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Titolo:
Polarographic reduction of nickel in the presence of various alkyl substituted o-diaminobenzenes
Autore:
Mark, HB; Koran, D; Gierst, L;
Indirizzi:
Univ Cincinnati, Dept Chem, Cincinnati, OH 45221 USA Univ Cincinnati Cincinnati OH USA 45221 pt Chem, Cincinnati, OH 45221 USA Free Univ Brussels, Dept Chem, Brussels, Belgium Free Univ Brussels Brussels Belgium ssels, Dept Chem, Brussels, Belgium
Titolo Testata:
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
fascicolo: 1-2, volume: 498, anno: 2001,
pagine: 228 - 231
Fonte:
ISI
Lingua:
ENG
Soggetto:
WATER-MERCURY INTERFACE; PHASE-TRANSITIONS; QUINOLINE GROUP; MOLECULES; BEHAVIOR; KINETICS;
Keywords:
polarography; catalytic prewave; substituted-o-diaminobenzenes; nickel(II); surface excess; differential capacitance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Mark, HB Univ Cincinnati, Dept Chem, Cincinnati, OH 45221 USA Univ Cincinnati Cincinnati OH USA 45221 Cincinnati, OH 45221 USA
Citazione:
H.B. Mark et al., "Polarographic reduction of nickel in the presence of various alkyl substituted o-diaminobenzenes", J ELEC CHEM, 498(1-2), 2001, pp. 228-231

Abstract

The catalytic polarographic prewave for the reduction of Ni(H2O)(6)(2+) inthe presence of a variety of alkyl substituted o-diaminobenzenes has been measured and compared to that observed with unsubstituted o-diaminobenzene. When the concentrations of the substituted diamines are low compared to [Ni2+] the prewaves are identical to those of the o-diaminobenzenes itself, indicating that the alkyl group has no effect on the formation of the activate intermediate. For comparable concentrations of the substituted diamines and [Ni2+], the prewave takes on an on-off step shape. Simple o-diaminobenzene does not show this behavior. Differential capacitance measurements and surface excess calculations show that no potential-dependent adsorption reorientation (two-dimensional phase change) occurs at these concentration-potential regions. Thus, some other phenomenon causes this on-off behavior. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 24/09/20 alle ore 20:30:17