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Pyrrole Ligands. III. The Stability of Dipyrromethenato Complexes of Cu (II) and Ni (II) in Aqueous Solutions

✍ Scribed by Hans Stünzi; Giorgio Anderegg

Publisher: John Wiley and Sons
Year: 1979
Tongue: German
Weight: 298 KB
Volume: 62
Category: Article
ISSN: 0018-019X
DOI: 10.1002/hlca.19790620130

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✦ Synopsis

Abstract

The protonation and complex formation of the new ligand 3,3′, 5,5′‐tetramethyl‐dipyrromethene‐4,4′‐dicarboxylate in aqueous solutions was investigated by alkalimetric titrations and spectrophotometric measurements (25°, I = 1 (KNO~3~)). The p__K__ values for the NH groups are 8.03 and 16.1 and logβ~2~ of the complexes with Cu (II) and Ni (II) are 31.0 and 24.4, respectively. Comparison with other ligands shows that the dipyrromethenato group acts as a normal rigid aromatic dinitrogen ligand, despite the charge on one nitrogen atom.

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