Complexing Power of Vitamin D 3 Toward Various Metals. Potentiometric Studies of Vitamin D 3 Complexes with Al 3+ , Cd 2+ , Gd 3+ , and Pb 2+ ions in Water-Ethanol Solution - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Solution Chemistry Année : 2003

Complexing Power of Vitamin D 3 Toward Various Metals. Potentiometric Studies of Vitamin D 3 Complexes with Al 3+ , Cd 2+ , Gd 3+ , and Pb 2+ ions in Water-Ethanol Solution

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Résumé

This study reports the stability constants of complexes with vitamin D 3 and Al 3+ , Cd 2+ , Gd 3+ and Pb 2+ ions in a water-ethanol medium (30/70% v/v at 25.0 • C). The logarithms of the overall stability constants are: β 1 = 12.4 ± 0.5, 7.6 ± 0.3, 9.33 ± 0.07, and 9.1 ± 0.5, respectively, whereas the logarithms of β 2 are 24.4 ± 0.5 (Al 3+), 14.3 ± 0.3 (Cd 2+), and 15.4 ± 0.5 (Pb 2+). Gd 3+ forms only the 1:1 complex. These values are compared to those reported previously and correlations are established between the stability constants and physical properties, such as the ionization energy.

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Chimie
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Dates et versions

hal-03221394 , version 1 (11-05-2021)

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Ana Lucia Ramalho Mercê, Lia Sayuri Yano, Mustayeen Ahmed Khan, Xuan Do Thanh, Gilles Bouet. Complexing Power of Vitamin D 3 Toward Various Metals. Potentiometric Studies of Vitamin D 3 Complexes with Al 3+ , Cd 2+ , Gd 3+ , and Pb 2+ ions in Water-Ethanol Solution. Journal of Solution Chemistry, 2003, 32 (12), pp.1075-1085. ⟨10.1023/B:JOSL.0000023922.74448.52⟩. ⟨hal-03221394⟩

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