Design and electrochemical characterization of a new cobalt(II)-cyclodextrin complex. Evidence for a supramolecular stabilization of the Co(I) state

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TitleDesign and electrochemical characterization of a new cobalt(II)-cyclodextrin complex. Evidence for a supramolecular stabilization of the Co(I) state
Publication TypeJournal Article
Year of Publication2009
AuthorsDeunf, E, Buriez O, Labbe E, Verpeaux JN, Amatore C
JournalElectrochemistry Communications
Volume11
Issue1
Pagination114-117
Date PublishedJan
ISBN Number1388-2481
Accession NumberISI:000263018200031
Abstract

The electrochemical behavior of a new cobalt-cycloclextrin (CD) complex was investigated, in dimethylformamide, from CoX2 (X = Br and BF4) in the presence of 1 equiv. 6-Deoxy-6-N-(2-methyliminopyridine)-beta-cyclodextrin as ligand. Under these conditions, it was demonstrated for the first time, that the electrogenerated cobalt(I) species can be kinetically and thermodynamically stabilized. The electrochemical study of CoX2 in the presence of a related iminopyridine ligand (2-pyridyl-N-benzylmethylimine), in which the cyclodextrin (CD) group was replaced by a simple aryl moiety, allowed to highlight the crucial role of the CD in this unexpected stabilization. Importantly, this unprecedented result was only observed when both the iminepyridine and the CD moieties were together covalently attached. Importantly, the supramolecular stabilized low-valent cobalt species remained fairly reactive towards aromatic halides despite its intrinsic stability. This original work opens new opportunities for the development of more selective catalytic processes both in organic and aqueous media. (c) 2008 Elsevier B.V. All rights reserved.

URL<Go to ISI>://000263018200031
DOI10.1016/j.elecom.2008.10.044
Short TitleDesign and electrochemical characterization of a new cobalt(II)-cyclodextrin complex. Evidence for a supramolecular stabilization of the Co(I) state
Unit: 
UMR 8640