Ordering phenomena in C -tetraphenylphosphonium bromide

Launois, Pascale; Moret, R.; Souza, Nicolas R. de; Azamar-Barrios, J.A.; Pénicaud, A.

doi:10.1007/pl00011044

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2001

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“…Further, ESR evidence of Jahn-Teller distortion of C 60 was reported in a model compound to observe Jahn-Teller splitting by reducing the exchange interaction between C 60 's [16]. X-ray analysis in a similar compound suggested a stabilization of static Jahn-Teller distortion by symmetry lowering induced by the merohedral ordering [17]. Table 1 shows physical properties of polymerized β-phase [11,12].…”

Section: Introductionmentioning

confidence: 91%

Magnetic properties of TDAE-C[sub 60] under pressure

Mizoguchi

Machino²,

Sakamoto³

et al. 2001

AIP Conference Proceedings

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Electron Spin Resonance (ESR) of α-TDAE-C 60 in a crystalline form was performed under pressure to investigate the mechanism of ferromagnetic phase transition, where TDAE is tetrakis-dimethylamino-ethylene. Curie temperature T C decreased parabolically, reaching zero around 9 kbar. It is demonstrated that an antiferro-orbital ordering model of Jahn-Teller distorted C − 60 anion is consistent with the experimental data, not only qualitatively but also quantitatively. Enough higher pressure than 10 kbar transforms α-TDAE-C 60 to β-type polymerized-form along caxis with [2+2] cycloadditive mechanism at room temperature. The β-form is stable even at ambient pressure and up to ≈430 K. Prominently, in the β-form, the spin on TDAE + cation, that was missing in the α-form, revives with the ESR g-shift in-between RbC 60 polymer and TDAE + radical cation.

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