Mixed metal complexes in solution. Part 4. Formation and stability of heterobinuclear complexes of cadmium(II)-citrate with some bivalent metal ions in aqueous solution |
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| Authors: | Paola Amico Pier Giuseppe Daniele Giorgio Ostacoli Guiseppe Arena Enrico Rizzarelli Silvio Sammartano |
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| Institution: | (1) Istituto di Analisi Chimica Strumentale dell'Università, Via Bidone 36, 10125 Torino, Italy;(2) Istituto Dipartimentale di Chimica e Chimica Industriale dell'Università, V. le A. Doria, 8, 95125 Catania, Italy;(3) Istituto di Chimica Analitica dell'Università, Via dei Verdi, 98100 Messina, Italy |
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| Abstract: | Summary The systems, Cd-Ni-citrate, Cd-Mn-citrate and Cd-Zn citrate have been investigated pH-metrically at 25°C and I = 0.1 mol dm–3 (KNO3).As previously found for analogous citrate systems (namely for Cu-Ni-, Cu-Zn- and Ni-Zn-citrate) the existence of mixed metal complexes of the type MM (cit)2H–2]4– has been shown. In addition, the species MM(cit)2H–1]3– was also found to be present for Cd-Ni- and Cd-Zn-citrate systems The significance of the formation of such species is discussed.The existence of mixed metal complexes is also discussed in connection with the transport and the absorption of metal ions in biological systems. |
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