Mohamed Mahmoud M A
Department of Sciences and Mathematics, New Valley-Faculty of Education, Assiut University, El-Kharga, New Valley, Egypt.
Ann Chim. 2007 Aug;97(8):759-70. doi: 10.1002/adic.200790059.
Equilibrium studies for the heavy metal ions La(III), Ce(III), Th(IV) and UO2(IV) (M) complexes of the zwitterionic buffer tricine (L) in aqueous solution are investigated. Stoichiometry and stability constants for the different complexes formed as well as hydrolysis products of the metal cations are determined at 25 degrees C and ionic strength 0.1 M NaNO3. The stability of the formed complexes are discussed in terms of the nature of the heavy metal cation. The solid complexes are synthesized and characterized by means of elemental analysis, FTIR, and TG analysis. The general molecular formulae of the obtained complexes is suggested to be M(L)2n-2(H2O)x, where n = the charge of the metal cation, x = no. of water molecules.
研究了两性离子缓冲剂三（羟甲基）甲基甘氨酸（L）与重金属离子La(III)、Ce(III)、Th(IV)和UO₂(IV)（M）在水溶液中的配合物平衡。在25℃和离子强度为0.1M NaNO₃的条件下，测定了形成的不同配合物以及金属阳离子水解产物的化学计量比和稳定常数。根据重金属阳离子的性质讨论了形成的配合物的稳定性。合成了固体配合物，并通过元素分析、傅里叶变换红外光谱（FTIR）和热重分析（TG）对其进行了表征。所得到的配合物的一般分子式建议为M(L)₂ₙ₋₂(H₂O)ₓ，其中n =金属阳离子的电荷数，x =水分子数。
