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Bis(arene)chromium‐containing polyacrylonitrile and its thermolysis products: synthesis, characterization and magnetic properties
Author(s) -
Domrachev George A.,
Douglas William E.,
Henner Bernard,
Klapshina Larisa G.,
Semenov Vladimir V.,
Sorokin Aleksey A.
Publication year - 1999
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/(sici)1099-1581(199904)10:4<215::aid-pat864>3.0.co;2-5
Subject(s) - polyacrylonitrile , thermal decomposition , chromium , acrylonitrile , materials science , methoxide , polymer chemistry , electron paramagnetic resonance , photochemistry , inorganic chemistry , polymer , chemistry , organic chemistry , copolymer , nuclear magnetic resonance , catalysis , metallurgy , composite material , physics
Polyacrylonitrile bonded to bis(arene)chromium complexes was prepared by the polycyanoethylation reaction between acrylonitrile and various bis(arene)chromium complexes. The star‐shaped molecules consisted of a central bis(arene)chromium species with up to four polyacrylonitrile arms (each composed of up to 63 acrylonitrile units) covalently bonded to the arene ligands. The products of thermolysis of the polymers at 160°C and 350°C were characterized by elemental analysis as well as infrared nuclear magnetic resonance, electron paramagnetic resonance, Mössbauer and X‐ray photoelectron spectroscopies. Thermolysis at 160°C resulted in essentially complete decomposition of the bis(arene)chromium complexes, the polyacrylonitrile chains remaining unaffected. At thermolysis temperatures above 300°C, cyanogen and ammonia were evolved, spectroscopic studies of the resulting material indicating formation of conjugated polynaphthyridine‐type products containing ketoimine fragments. The product of thermolysis at 160°C showed room temperature ferromagnetism and that obtained at 350°C was an antiferromagnet with a Neel temperature of ca. 150 K. Copyright © 1999 John Wiley & Sons, Ltd.