Premium
Complex Formation of Copper(II) and Nickel(II) with Pyrrole Ligands in Aqueous Solution
Author(s) -
Stünzi Hans,
Anderegg Giorgio
Publication year - 1976
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19760590521
Subject(s) - chemistry , deprotonation , ethylenediamine , pyrrole , methylamine , aqueous solution , amide , medicinal chemistry , nickel , potentiometric titration , iminodiacetic acid , polymer chemistry , copper , inorganic chemistry , organic chemistry , chelation , ion
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.