Transition metal ions and amides. VIII. Discrimination between different models for the complexation of Cu2+ with N, N′‐diglycyl 1, 2‐ethanediamine, N, N′‐diglycyl‐1, 3‐propanediamine and glycine ethylamide by potentiometric or by spectrophotometric titration
Transition metal ions and amides. VIII. Discrimination between different models for the complexation of Cu2+ with N, N′‐diglycyl 1, 2‐ethanediamine, N, N′‐diglycyl‐1, 3‐propanediamine and glycine ethylamide by potentiometric or by spectrophotometric titration
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VIII. 通过电位法或分光光度法区分 Cu2+ 与 N,N-二甘氨酰 1, 2-乙二胺、N,N-二甘氨酰-1, 3-丙二胺和甘氨酸乙酰胺络合的不同模型。滴定
DOI：
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发表时间：
1982
期刊：
影响因子：
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通讯作者：
A. Zuberbühler
中科院分区：
文献类型：
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作者：
M. Briellmann;A. Zuberbühler
Cue2+ 与 1, 8-diamino-3, 6-diaza-2, 7-octanedione (N, N'-diglycyl-1, 2-乙二胺, DED) 和与 1, 9-diamino-3, 7-diaza-2, 8nonanedione (N, N'-diglycyl-1, 3-propanediamine, DPD) 的络合已通过以下方法进行了研究电位滴定法和分光光度滴定法。两个配体 L 与 Cue2+ 的络合导致与 CuLH3+、CuL2+、CuLH−2 和二聚 Cu2L 络合物的相对复杂的平衡。通过 DED，另外形成另一种二聚体 Cu2L2H。使用分光光度滴定和电位滴定的独立数值处理来获得令人满意的络合模型并测试两种方法的相对区分能力。甘氨酸乙酰胺 (GEA) 滴定用作附加测试并作为 DED 和 DPD 的模型。结果表明，在每种情况下，只要在数值处理中使用最佳数学算法，分光光度滴定都会给出相似的再现性结果，并且具有等于或优于电位滴定的辨别能力。
The complexation of Cue2+ with 1, 8-diamino-3, 6-diaza-2, 7-octanedione (N, N′-diglycyl-1, 2-ethanediamine, DED) and with 1, 9-diamino-3, 7-diaza-2, 8nonanedione (N, N′-diglycyl-1, 3-propanediamine, DPD) has been studied by potentiometric and by spectrophotometric titration. With both ligands L the complexation to Cue2+ leads to relatively complicated equilibria with CuLH3+, CuL2+, CuLH−2, and dimeric Cu2L complexes. With DED, another dimeric species, Cu2L2H, is formed in addition. Independent numerical treatment of spectrophotometric and poteritiometric titrations was used to obtain a satisfactory model for the complexation and to test the relative discriminatory power of the two methods. Titrations of glycine ethylamide (GEA) were used as an additional test and as a model for DED and DPD. It was shown that in each case spectrophotometric titrations give results of similar reproducibility and have a discriminatory power equal to or better than potentiometric titrations, provided that optimum mathematical algorithms are used in the numerical treatment.