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本文用pH电位法研究了在70％(v/v)乙醇-水溶液中Cd(Ⅱ)与维生素D_3(VD_3)和乙二胺(en)或2,2′-联吡啶(bipy)在37±0.1℃和离子强度为0.10(KNO_3)条件下,三元混配配合物的稳定性.结果表明,上述混合配位体系均形成稳定的1:1:1型混配配合物,且△log K值均为较大的正值(分别为+1.06和+1.54),但相应的logX值却并不很大(分别为2.18和2.83).从统计效应和配合物分子内的配体间疏水相互作用,讨论了造成这种反常结果的可能原因,并针对如何判断三元混配配合物相对稳定性高低等问题提出了作者的见解.
In this paper, the effects of Cd (Ⅱ) and vitamin D_3 (VD_3) and ethylenediamine (bipy) and Cd (Ⅱ) in 70% (v / 0.1) and ionic strength of 0.10 (KNO_3), the stability of the ternary complex was studied.The results showed that the mixed ligands all formed a stable 1: 1: 1 mixed complex and △ log K Values were larger positive values (+1.06 and +1.54, respectively), but the corresponding logX values were not significant (2.18 and 2.83, respectively). From the statistical effect and the intramolecular hydrophobic interaction The author discusses the possible causes of this abnormal result and proposes the author’s opinion on how to judge the relative stability of the ternary complex.