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Adsorption ofp-aminobenzenesulfonamide and its N1-phenyl and N1-pyridyl derivatives at the electrode—Solution interface

Authors
Journal
Journal of Electroanalytical Chemistry
0022-0728
Publisher
Elsevier
Publication Date
Volume
128
Identifiers
DOI: 10.1016/s0022-0728(81)80207-0

Abstract

Summary The adsorption of some sulfa-drugs, p-NH 2ØSO 2NH 2, p-NH 2ØSO 2NHO, p-NH 2ØSO 2NHPy, was studied by a differential capacitance method at pH=12 at the dropping mercury electrode. The area occupied by each molecule of the N 1-derivative compounds adsorbed at the mercury electrolyte solution interface is ⋍80 Å 2 which corresponds closely to the area expected for a molecule adsorbed flat on the electrode surface with its p-NH 2Ø−S moiety. The Δ G ads 0(θ→0) values obtained at different potentials suggest that the adsorption process is less favoured when the potential decreases; however, the N 1-pyridine derivative is always less adsorbed than the other sulfanilamides.

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