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Interelectronic Exchange Interactions between Organic Radicals in the Solid State

Published online by Cambridge University Press:  25 February 2011

Frank C. Rossitto and
Paul M. Lahti
Frank C. Rossitto
Affiliation:
University of Massachusetts, Department of Chemistry, Amherst, MA 01003, USA
Paul M. Lahti
Affiliation:
University of Massachusetts, Department of Chemistry, Amherst, MA 01003, USA
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Abstract

The poly(4'-vinylphenoxy) nonconjugated polyradical was generated by photolysis of an oxalate-functionalized poly(4-hydroxystyrene). Spin-counting experiments in the electron spin resonance spectrum (ESR) showed efficient production of radicals with g = 2.0041, consistent with the expected pendant phenoxyl radicals. The thermal behavior of the ESR signal intensity indicated through-space antiferromagnetic coupling of the pendant radicals. The similarity of the behavior of this nonconjugated system to that of nominally conjugated polyradical systems synthesized by others suggests that geometric effects leading to deconjugation may be a major consideration in the synthesis of organic ferromagnetically exchange coupled polyradicals.

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References

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