Preparation and photochemistry of cobalt(III) amino and amino acidato complexes containing tripodal polypyridine ligands

The photochemical reactivities of cobalt(III)-diamine and cobalt(III)-amino acid compounds have been compared using complexes that also contain polypyridyl ligands. Metallacyclic complexes result from UV-induced photodecarboxylation reactions of the amino acid complexes. UV-irradiation of closely re...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2004-01 (1), p.150-156
Main Authors: Otter, Carl A, Hartshorn, Richard M
Format: Article
Language:English
Subjects:
Amines - chemistry
Amino Acids - chemistry
Cobalt - chemistry
Crystallography, X-Ray
Models, Chemical
Models, Molecular
Molecular Structure
Photochemistry
Pyridines - chemistry
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Summary:The photochemical reactivities of cobalt(III)-diamine and cobalt(III)-amino acid compounds have been compared using complexes that also contain polypyridyl ligands. Metallacyclic complexes result from UV-induced photodecarboxylation reactions of the amino acid complexes. UV-irradiation of closely related complexes with amine donors replacing the carboxylate donors does not lead to the production of the same metallacyclic products. The reported UV-induced fragmentation of amine donors and subsequent metallacycle formation appears not to be a general reaction. Nine cobalt(III) complexes of polypyridyl ligands have been structurally characterised, including four that also contain amino acid ligands and one that contains a three-membered metallacyclic ring.
ISSN:1477-9226
DOI:10.1039/b311809f