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 titra
作者:Markus Briellmann、Andreas D. Zuberbühler
DOI:10.1002/hlca.19820650106
日期:1982.2.3
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
Cue 2+与1、8-二氨基-3、6-二氮杂2、7-辛二酮(N,N'-二甘氨基-1、2-乙二胺,DED)和1,9-二氨基-3的络合,通过电位滴定法和分光光度滴定法研究了7-diaza-2,8nonanedioneone(N, N'-diglycyl-1,3-propanediamine,DPD)。在两个配体L下,与Cue 2+的络合导致与CuLH 3+,CuL 2 +,CuLH -2和二聚体Cu 2 L络合物的相对复杂的平衡。与DED,另一种二聚体Cu 2 L 2另外形成H 1。分光光度法和电位滴定法的独立数值处理用于获得令人满意的络合模型并测试这两种方法的相对区分能力。甘氨酸乙酰胺(GEA)的滴定用作附加测试以及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了最佳的数学算法,分光光度滴定法都可得到相似的重现性,并具有等于或优于电位滴定法的鉴别能力。