ISSN print edition: 0366-6352
ISSN electronic edition: 1336-9075
Registr. No.: MK SR 9/7
Characterization of Stable Nitroxide Radicals on the Basis of Adduct Chromophore-Hindered Amine Utilizing EPR Spectroscopy in Solution and Polymer Matrix
Ľ. Búcsiová, A. Búcsi, P. Hrdlovič, and Š. Chmela
Polymer Institute, Slovak Academy of Sciences,
SK-842 36 Bratislava
Received: 27 September 2001
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.
Full paper in Portable Document Format: 564a275.pdf
Chemical Papers 56 (4) 275–281 (2002)