Journal
POLYHEDRON
Volume 24, Issue 16-17, Pages 2544-2549Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2005.03.127
Keywords
conjugated polymer; polyradical; phenoxyl; poly(aryleneethynylene); anthracene; high-spin polymer
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We synthesized monodisperse oligo(9,10-anthryleneethynylene)s with pendant phenol residues at the 2- and 7-positions. The absorption maxima of oligomers shifted to longer wavelength with the degree of polymerization, suggesting a developed pi-conjugation correlated with the chain length. The static magnetic susceptibility of the dimeric radical was measured using a SQUID magnetometer, and the 2J (J: spin coupling constant through the dianthrylacetylene unit) value of the dimeric radical was 34 cm(-1), which agreed with the 2J value of the corresponding 2-substituted dimeric radical (31 cm(-1)). These large 2J values of the dimeric radicals can be explained from less steric hindrance between the side chain radicals and the backbone. (c) 2005 Elsevier Ltd. All rights reserved.
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