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Reactivity of pyrrole pigments, XIX. On the structure of Cu(II) and Zn(II) chelates of dipyrrins in solution

✍ Scribed by A. Jaumà; J. -A. Farrera; J. M. Ribó

Book ID
104950072
Publisher
Springer Vienna
Year
1996
Tongue
English
Weight
503 KB
Volume
127
Category
Article
ISSN
0026-9247

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## 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