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Closed Access item Macromolecular polyradicals with cyclic triphosphazene as a core. Spectral and electrochemical properties

Authors:Carriedo, Gabino A.
García Alonso, Francisco J.
Gómez Elipe, P.
Brillas, Enric
Labarta, Amílcar
Juliá, Lluís
Keywords:Cyclotriphosphazenes, Electrochemical properties, Spectral properties, Electron-transfer reactions
Issue Date:9-Jan-2004
Publisher:American Chemical Society
Citation:Journal of Organic Chemistry 69(1): 99-104 (2004)
Abstract:Stable cyclotriphosphazenes 5 and 6, with three and four carbon radical centers, have been prepared by condensation of (4-hydroxy-2,6-dichlorophenyl)bis(2,4,6-trichlorophenyl)methyl radical (4) with tetrachloro-2,2‘-dioxybiphenylcyclotriphosphazene (7). EPR studies of both polyradicals in fluid solution suggest an electronic communication through the PN multiple bonds of the cycle. EPR spectral results in frozen solutions and magnetic susceptibility measurements in the solid are consistent with very weak electron−electron dipolar interactions. Reductive cyclic voltammetry shows a single three-electron redox couple for triradical 5 and a single four-electron redox couple for tetraradical 6. Both polyradicals 5 and 6 have been chemically oxidized to a stable trication 53+ and a tetracation 64+, respectively, by electron-transfer reactions.
Description:6 pages, 6 figures, 2 tables, 2 charts.-- PMID: 14703384 [PubMed].-- Available online Dec 9, 2003.
Publisher version (URL):http://dx.doi.org/10.1021/jo035349u
ISSN:0022-3263 (Print)
1520-6904 (Online)
Appears in Collections:(IQAC) Artículos

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