The interaction of N-(phenylsulfonyl)glycine and N-(tolylsulfonyl)glycine (L) with Cd2+ and Zn2+ was investigated through dc polarography, pH-metric titrations, and H-1 NMR spectroscopy. 2,2'-Bipyridine as additional ligand lowers the pK(a) of Cd2+-promoted deprotonation of the sulfonamide nitrogen (from 8 in the binary system to 7.6 in the presence of the heteroaromatic base), as previously observed for the Cu2+ ion, and, most of all, enables the Zn2+ ion to substitute for the sulfonamide nitrogen bound hydrogen of these ligands. It is known that Zn2+ is ineffective in such a substitution in binary Zn2+-L systems.
Cd2+ and Zn2+ interactions with amino acids N-substituted by a sulfonic group.Effect of the additional ligand 2,2'-bipyridine on the metal-induced amine deprotonation / Gb, Gavioli; Borsari, Marco; Menabue, Ledi; Saladini, Monica; Sola, Marco. - In: INORGANIC CHEMISTRY. - ISSN 0020-1669. - STAMPA. - 30:(1991), pp. 498-502.
Cd2+ and Zn2+ interactions with amino acids N-substituted by a sulfonic group.Effect of the additional ligand 2,2'-bipyridine on the metal-induced amine deprotonation
BORSARI, Marco;MENABUE, Ledi;SALADINI, Monica;SOLA, Marco
1991
Abstract
The interaction of N-(phenylsulfonyl)glycine and N-(tolylsulfonyl)glycine (L) with Cd2+ and Zn2+ was investigated through dc polarography, pH-metric titrations, and H-1 NMR spectroscopy. 2,2'-Bipyridine as additional ligand lowers the pK(a) of Cd2+-promoted deprotonation of the sulfonamide nitrogen (from 8 in the binary system to 7.6 in the presence of the heteroaromatic base), as previously observed for the Cu2+ ion, and, most of all, enables the Zn2+ ion to substitute for the sulfonamide nitrogen bound hydrogen of these ligands. It is known that Zn2+ is ineffective in such a substitution in binary Zn2+-L systems.Pubblicazioni consigliate
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