Paramagnetism and semiconductivity in doped charge-transfer complexes

Mufaro J. Hove, Brian M. Hoffman*, Robert J. Loyd

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We have studied the epr and conductivity of the nonionic charge-transfer (D-A) complexes carbazole-tetracyanoquinodimethane and carbazole-2,3-dichloro-5,6-dicyanobenzoquinone. These complexes are intrinsically nonionic and therefore diamagnetic, but they exhibit weak, temperature-dependent paramagnetism due to the presence of paramagnetic impurities. Interactions among unpaired impurity spins result in a nonmagnetic ground state and paramagnetic excitations. The complexes behave as semiconductors with activation energy for conduction greater than that for the creation of the paramagnetic spins, but doping the complexes with A-, analogous to n doping in inorganic semiconductors, suggests that both the conductivity and the paramagnetic properties are associated with the unpaired electrons on the A- anions.

Original languageEnglish (US)
Pages (from-to)1849-1853
Number of pages5
JournalJournal of physical chemistry
Volume76
Issue number13
DOIs
StatePublished - Jan 1 1972

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

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