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N-heterocyclic carbene bonding to cobalt porphyrin complexes
Date Issued
2012-01
Date Available
2012-06-07T15:20:53Z
Abstract
N-heterocyclic carbene (NHC) coordination to a cobalt(III) center embedded in a porphyrin scaffold has been accomplished by decarboxylation from N,N’-dimethylimidazolium-2-carboxylate in the presence of Co(TPP)Cl (TPP = 5,10,15,20-tetraphenylporphyrin). The distal chloride ligand in the resulting complexes Co(NHC)(TPP)Cl was successfully substituted with imidazoles and alcohols. Single crystal X-ray diffraction of the latter complexes Co(NHC)(TPP)(ROH) (R = Me, Et) revealed a pronounced ruffling of the porphyrin macrocycle due to the two ortho methyl groups in the carbene ligand and because of the relatively short distance between the cobalt center and the carbene ligand. Spectroscopic investigations support a substantial porphyrin dearomatization upon NHC bonding.
Sponsorship
European Research Council
Other funder
Other Sponsorship
Swiss National Science Foundation
Type of Material
Journal Article
Publisher
Elsevier
Journal
Inorganica Chimica Acta
Volume
380
Start Page
90
End Page
95
Copyright (Published Version)
2011 Elsevier B.V.
Subject – LCSH
Cobalt
Carbenes (Methylene compounds)
Porphyrins
Imidazoles
Language
English
Status of Item
Peer reviewed
This item is made available under a Creative Commons License
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