Characterization of Stable Nitroxide Radicals on the Basis of Adduct Chromophore-Hindered Amine Utilizing EPR Spectroscopy in Solution and Polymer Matrix

Búcsiová, Ľ., Búcsi, A., Hrdlovič, P. and Chmela, Š. Characterization of Stable Nitroxide Radicals on the Basis of Adduct Chromophore-Hindered Amine Utilizing EPR Spectroscopy in Solution and Polymer Matrix Chemical Papers, Vol.56, No. 4, 2002, 281-275

Document type: Článok z časopisu / Journal Article
Collection: Chemical papers  
 
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Author(s) Búcsiová, Ľ.
Búcsi, A.
Hrdlovič, P.
Chmela, Š.
Title Characterization of Stable Nitroxide Radicals on the Basis of Adduct Chromophore-Hindered Amine Utilizing EPR Spectroscopy in Solution and Polymer Matrix
Journal name Chemical Papers
Publication date 2002
Year available 2002
Volume number 56
Issue number 4
ISSN 0366-6352
Start page 281
End page 275
Place of publication Poland
Publisher Versita
Collection year 2002
Language english
Subject 250000 Chemical Sciences
250500 Macromolecular Chemistry
Abstract/Summary EPR spectra of 17 stable nitroxide radicals on the basis of 4-substituted 1-oxyl-2,2,6,6- tetramethylpiperidine in solution (benzene) and in polymer matrices (PVC, iPP) were studied. Four derivatives containing pyrene and five with naphthalene as chromophore were used. They differ from each other by the length and type of bridge, connecting covalently the piperidine radical to chromophore. Two biradicals containing phosphorus and sulfur and one triradical containing phosphorus were investigated. In solution EPR spectra of probes containing one nitroxyl group provide triplet with line of equal intensity. The biradicals spectra were quintets and the triradical was septet. The purity of the prepared compounds was determined from the integrals of EPR spectra. In polymer matrices at room temperature the EPR spectra of monoradicals derived from hindered amines provide anisotropic spectra, typical for nitroxyl radicals in solid phase.
 
 
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