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

Stünzi Hans | Zendy; Anderegg Giorgio | Zendy

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

Author(s) -

Stünzi Hans,

Anderegg Giorgio

Publication year - 1979

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.19790620130

Subject(s) - chemistry , protonation , aqueous solution , pyrrole , titration , ligand (biochemistry) , nitrogen atom , nitrogen , medicinal chemistry , inorganic chemistry , crystallography , group (periodic table) , ion , organic chemistry , biochemistry , receptor

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 NH 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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