Magnetic Study of N , N , N ′, N ′-Tetramethyl- p -phenylenediamine (Wurster’s Blue) Tetrafluoroborate Cation Radical
1979; Oxford University Press; Volume: 52; Issue: 10 Linguagem: Inglês
10.1246/bcsj.52.2819
ISSN1348-0634
AutoresJun Yamauchi, Hideo Fujita, Yasuo Deguchi,
Tópico(s)Electron Spin Resonance Studies
ResumoAbstract Wurster’s Blue cation radical, which is composed of TMPD cation and BF4 anion moieties, was prepared and its magnetic properties were examined. The cation radical shows similar magnetic behavior to that of the TMPD–ClO4 cation radical, but there is a slight perturbation when changing the counteranions from perchlorate to tetrafluoroborate. A phase transition takes place at 190.5 K, which is attributable to a dimerization involving a small molecular displacement in the crystal lattice. These phenomena are discussed using the magnetic susceptibility data, thermal study, and ESR observations due to triplet exciton. The magnetic data are described by comparison with Wurster’s Blue perchlorate cation radical.
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