Complexation of thorium(IV) with 2-furoic acid and 2-thenoic acid in aqueous solution
Complexation of thorium(IV) with 2-furoic acid and 2-thenoic acid in aqueous solution
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DOI：
10.1039/b209905e
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发表时间：
2003-02-07
影响因子：
4
通讯作者：
Rao, LF
中科院分区：
文献类型：
--
作者：
Bismondo, A;Di Bernardo, P;Rao, LF
研究了 Th(IV) 与 2-糠酸 (C4H3OCOOH) 和 2-thenoic Acid (C4H3SCOOH) 在 1.0 mol dm(-3) NaClO4 中在 25℃ 下的络合反应。通过电位法和量热法测定了连续配合物 ThLj(4-j)+ 的形成常数，其中 L 代表糠酸根或酚酸根阴离子，对于 2-糠酸 j = 1-3，对于 2-酚酸 j = 1-2，以及相应的络合摩尔焓。光谱技术，包括 FT 拉曼和扩展 X 射线吸收精细结构 (EXAFS) 用于获取有关 Th(IV) 和配体之间相互作用的更多信息。热力学和光谱数据均与 ThLj(4-j)+ 复合物的形成一致，这与文献中早期的结果相反，文献中的结果表明质子化复合物 ThL4H22+ 和 ThL3H23+ 在实验条件下占主导地位。结合其他一元羧酸的数据讨论了糠酸和脂肪酸与 Th(IV) 的结合强度。
Complexation of Th(IV) with 2-furoic acid (C4H3OCOOH) and 2-thenoic acid (C4H3SCOOH) in 1.0 mol dm(-3) NaClO4 has been studied at 25degreesC. The formation constants of successive complexes ThLj(4-j)+, where L stands for the furoate or thenoate anion and j = 1-3 for 2-furoic acid and j = 1-2 for 2-thenoic acid, and corresponding molar enthalpies of complexation were determined by potentiometry and calorimetry. Spectroscopic techniques, including FT Raman and Extended X-Ray Absorption Fine Structure (EXAFS) were used to acquire further information on the interaction between Th(IV) and the ligands. Both the thermodynamic and spectroscopic data are consistent with the formation of ThLj(4-j)+ complexes, in contrast to earlier results in the literature which suggest that the protonated complexes ThL4H22+ and ThL3H23+ are dominant under the experimental conditions. The binding strength of furoic acid and thenoic acid with Th(IV) is discussed in conjunction with the data for other monocarboxylic acids.