Complex equilibria in aqueous solutions of Ti3+–glycine and –malonic acid
Pócsi, István; Fábián, István
Журнал:
Journal of the Chemical Society, Dalton Transactions
Дата:
1988
Аннотация:
The hydrolytic processes of Ti<sup>3+</sup> and the equilibria of the Ti<sup>3+</sup>â glycine (HL) and â malonic acid (H2Lâ ²) systems were studied by pH-metry in aqueous solution (25 °C, I= 1.0 mol dm<sup>â 3</sup> KCl). It was demonstrated that more than one equilibrium model are suitable to interpret the hydrolytic reactions. In the Ti<sup>3+</sup>â glycine system the formation of complexes [TiHL]<sup>3+</sup> and [TiL]<sup>2+</sup> were identified; their stability constants are logβTiHL= 11.44 and logβTiL= 9.30. For the malonato complexes the following stepwise stability constants were determined: logK 1= 6.83, logK 2= 4.99, and logK 3= 2.84. Some aspects of the equilibrium of Ti<sup>3+</sup> are discussed.
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