Ferromagnetic spin alignment in head-to-tail coupled oligo(1,4-phenyleneethynylene)s and oligo(1,4-phenylenevinylene)s bearing pendant p-phenylenediamine radical cations

P.J. Meurs, van, R.A.J. Janssen

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39 Citations (Scopus)

Abstract

The intramolecular and long-range ferromagnetic coupling between p-phenylenediamine radical cations in head-to-tail coupled oligo(1,4-phenyleneethynylene)s and oligo(1,4-phenylenvinylene)s between neighbors and next-nearest neighbors is described. UV/vis/near-IR experiments show that the radical cations are localized in the pendant p-phenylenediamine units of the conjugated oligomers. The ESR spectra of these oligo(1,4-phenyleneethynylene) and oligo(1,4-phenylenvinylene) di(radical cation)s are consistent with those of a triplet state. A linear behavior is observed for the doubly integrated ESR intensity of the ¿Ms = ±1 and ¿Ms = ±2 signals with the inverse temperature (I 1/T), consistent with Curie's law. This behavior indicates a triplet ground-state diradical with a large triplet-singlet energy gap or possibly a degeneracy of singlet and triplet states.
Original languageEnglish
Pages (from-to)5712-5719
Number of pages7
JournalJournal of Organic Chemistry
Volume65
Issue number18
DOIs
Publication statusPublished - 2000

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