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Controlling Valence Tautomerism of Cobalt Complexes Containing the Benzosemiquinone Anion as Ligand
Author(s) -
Adams David M.,
Dei Andrea,
Rheingold Arnold L.,
Hendrickson David N.
Publication year - 1993
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199308801
Subject(s) - chemistry , microcrystalline , cobalt , tautomer , diimine , ligand (biochemistry) , denticity , ion , crystallography , valence (chemistry) , stereochemistry , inorganic chemistry , crystal structure , catalysis , receptor , organic chemistry , biochemistry
The transformation from Co II to Co III (e.g., 1 → 2 ) is displayed by the compounds of type 1 in solution when the temperature is lowered (L is a bidentate N‐donor ligand with a diimine structure, 3,5‐dtbsq − the 3,5‐di‐ tert ‐butylbenzosemiquinone anion, and 3,5‐dtbcat − the corresponding catecholate ion). In the process one electron is transferred from the Co center to one of the 3,5‐dtbsq − ligands to form the catecholate ligand. Microcrystalline samples in which L is phenanthroline undergo the transformation abruptly at about 240 K.