Abstract
The isotope effect of hydrogen motion in an organic ferroelectric, phenazine (Phz)–chloranilic acid(H2ca and D2ca for normal and deuterated compounds, respectively) co-crystal, was studied by35Cl nuclear quadrupole resonance (NQR). Besides a ferroelectric transition atTc = 253 K (303 K), a neutral-to-ionic transition was found below 170 K (200 K) forPhz–H2ca (Phz–D2ca). 1H–14N nuclear quadrupole double resonance measurements were also madein order to study the temperature dependent electronic state ofPhz–(H/D)2ca. 14N NQR parameters suggested that donor orbital populations of the two nitrogen atoms in aphenazine molecule become nonequivalent (1.78 and 1.97) in the ferroelectric phase,while they are both equal to 1.89 in the paraelectric phase. In the ionic phase ofPhz–D2ca, which was obtained by cooling below 188 K, they became 1.50 and 1.95, suggesting a proton transferfrom D2ca to Phz.
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