N-heterocyclic carbene bonding to cobalt porphyrin complexes

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Title: N-heterocyclic carbene bonding to cobalt porphyrin complexes
Authors: Albrecht, Martin
Maji, Pathik
Häusl, Christina
Monney, Angèle
Müller-Bunz, Helge
Permanent link: http://hdl.handle.net/10197/3626
Date: Jan-2012
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.
Funding Details: European Research Council
Other funder
Type of material: Journal Article
Publisher: Elsevier
Copyright (published version): 2011 Elsevier B.V.
Keywords: Cobalt;N-heterocyclic carbene;Porphyrin;Imidazole;Steric strain;Ligand substitution
Subject LCSH: Cobalt
Carbenes (Methylene compounds)
Porphyrins
Imidazoles
DOI: 10.1016/j.ica.2011.08.039
Language: en
Status of Item: Peer reviewed
Appears in Collections:Chemistry Research Collection

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