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Complex Formation of Copper(II) and Nickel(II) with Pyrrole Ligands in Aqueous Solution

✍ Scribed by Hans Stünzi; Giorgio Anderegg

Publisher
John Wiley and Sons
Year
1976
Tongue
German
Weight
879 KB
Volume
59
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

Four new ligands, namely the N‐substituted 2‐(4‐sulfonyl)‐pyrrylmethyl derivatives of methylamine, glycine, ethylenediamine and iminodiacetic acid, were synthesized to investigate the coordinating tendency of pyrrolic nitrogen in aqueous solution. The complex formation of these ligands with Cu^++^ and Ni^++^ was studied by means of alkalimetric titrations. It is shown that the coordinating tendency of the deprotonated pyrrole group is similar to that of a deprotonated amide group. The deprotonated pyrrole group stabilizes the Cu^++^ complexes of its iminodiacetate and ethylenediamine derivatives to an extent similar to that of a 2‐pyridyl‐methyl or 2′‐aminoethyl group, despite the different basicity of these substituents. On the other hand, the neutral pyrrole group shows no coordinating tendency.

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