The adsorption of some sulfa-drugs, p-NH2ØSO2NH2, p-NH2ØSO2NHO, p-NH2ØSO2NHPy, was studied by a differential capacitance method at pH=12 at the dropping mercury electrode. The area occupied by each molecule of the N1-derivative compounds adsorbed at the mercury. electrolyte solution interface is {reversed tilde equals}80 Å2 which corresponds closely to the area expected for a molecule adsorbed flat on the electrode surface with its p-NH2Ø-S moiety. The ΔGads0(θ→0) values obtained at different potentials suggest that the adsorption process is less favoured when the potential decreases; however, the N1-pyridine derivative is always less adsorbed than the other sulfanilamides. © 1981 Elsevier Sequoia S.A.
Adsorption of p-aminobenzenesulfonamide and its N1-phenyl and N1-pyridyl derivatives at the electrode-Solution interface / Battini, R.; Gavioli, G. B.; Grandi, G.; Benedetti, L.; Andreoli, R.. - In: JOURNAL OF ELECTROANALYTICAL CHEMISTRY AND INTERFACIAL ELECTROCHEMISTRY. - ISSN 0022-0728. - 128:C(1981), pp. 223-228. [10.1016/S0022-0728(81)80207-0]
Adsorption of p-aminobenzenesulfonamide and its N1-phenyl and N1-pyridyl derivatives at the electrode-Solution interface
Battini R.;
1981
Abstract
The adsorption of some sulfa-drugs, p-NH2ØSO2NH2, p-NH2ØSO2NHO, p-NH2ØSO2NHPy, was studied by a differential capacitance method at pH=12 at the dropping mercury electrode. The area occupied by each molecule of the N1-derivative compounds adsorbed at the mercury. electrolyte solution interface is {reversed tilde equals}80 Å2 which corresponds closely to the area expected for a molecule adsorbed flat on the electrode surface with its p-NH2Ø-S moiety. The ΔGads0(θ→0) values obtained at different potentials suggest that the adsorption process is less favoured when the potential decreases; however, the N1-pyridine derivative is always less adsorbed than the other sulfanilamides. © 1981 Elsevier Sequoia S.A.
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