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Tripyrrindione as a Redox‐Active Ligand: Palladium(II) Coordination in Three Redox States
Author(s) -
Gautam Ritika,
Loughrey Jonathan J.,
Astashkin Andrei V.,
Shearer Jason,
Tomat Elisa
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201507302
Subject(s) - redox , ligand (biochemistry) , chemistry , non innocent ligand , palladium , divalent , coordination sphere , combinatorial chemistry , photochemistry , inorganic chemistry , crystallography , catalysis , organic chemistry , crystal structure , biochemistry , receptor
The tripyrrin‐1,14‐dione scaffold of urinary pigment uroerythrin coordinates divalent palladium as a planar tridentate ligand. Spectroscopic, structural and computational investigations reveal that the tripyrrindione ligand binds as a dianionic radical, and the resulting complex is stable at room temperature. One‐electron oxidation and reduction reactions do not alter the planar coordination sphere of palladium(II) and lead to the isolation of two additional complexes presenting different redox states of the ligand framework. Unaffected by stability problems common to tripyrrolic fragments, the tripyrrindione ligand offers a robust platform for ligand‐based redox chemistry.