The behaviour of histidine and ornithine as ligands (L) towards cadmium(II) has been studied at 25-degrees-C. Complex formation between histidine and cadmium(II) has been investigated in two ionic media 1 M NaCl and 1 M NaClO4, while the system ornithine - cadmium(II) has been studied in 1 M NaCl. Experimental data, obtained by measuring the electromotive force of galvanic cells containing glass and stationary diluted cadmium amalgam, were explained by assuming formation of CdL+, CdHL2+, CdH2L3+, CdL2, CdHL2+, and CdH2L22+. In 1 M NaClO4 species CdH2L22+ was not present in appreciable concentration. The stability constants of each complex have been determined showing that protonated species prevail in a wide range of concentration of reagents, even in neutral or moderately alkaline solution. The results have been discussed and compared with those obtained for aspartate and glutamate.

Complex formation between cadmium(II) and histidine or ornithine / Bottari, Emilio Giovanni; Festa, Maria Rosa. - In: ANNALI DI CHIMICA. - ISSN 0003-4592. - STAMPA. - 83:(1993), pp. 315-329.

Complex formation between cadmium(II) and histidine or ornithine.

BOTTARI, Emilio Giovanni;FESTA, Maria Rosa
1993

Abstract

The behaviour of histidine and ornithine as ligands (L) towards cadmium(II) has been studied at 25-degrees-C. Complex formation between histidine and cadmium(II) has been investigated in two ionic media 1 M NaCl and 1 M NaClO4, while the system ornithine - cadmium(II) has been studied in 1 M NaCl. Experimental data, obtained by measuring the electromotive force of galvanic cells containing glass and stationary diluted cadmium amalgam, were explained by assuming formation of CdL+, CdHL2+, CdH2L3+, CdL2, CdHL2+, and CdH2L22+. In 1 M NaClO4 species CdH2L22+ was not present in appreciable concentration. The stability constants of each complex have been determined showing that protonated species prevail in a wide range of concentration of reagents, even in neutral or moderately alkaline solution. The results have been discussed and compared with those obtained for aspartate and glutamate.
1993
AMINO-ACIDS, LIGANDS
01 Pubblicazione su rivista::01a Articolo in rivista
Complex formation between cadmium(II) and histidine or ornithine / Bottari, Emilio Giovanni; Festa, Maria Rosa. - In: ANNALI DI CHIMICA. - ISSN 0003-4592. - STAMPA. - 83:(1993), pp. 315-329.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/462055
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