Observation of Quantum Paraelectricity in an Intermolecular Ionic Hydrogen-Bonded Crystal of a Squaric Acid Derivative
作者:Isao Takasu、Akira Izuoka、Tadashi Sugawara、Tomoyuki Mochida
DOI:10.1021/jp030961a
日期:2004.5.1
Proton transfer in a hydrated crystal of a squaric acid derivative, p-phenylenebis(squaric acid) (PBSQ), was investigated by means of ac dielectric measurements. The crystal consisted of PBSQ monoanions and protonated water dimer (H5O2+) counter cations, and a highly symmetric, one-dimensional hydrogen-bonded chain was formed through strong OH· · ·O- ionic hydrogen bonding between deprotonated PBSQ
通过交流介电测量研究了方酸衍生物对亚苯基双(方酸)(PBSQ)的水合晶体中的质子转移。该晶体由PBSQ单阴离子和质子化水二聚体(H5O2+)抗衡阳离子组成,通过去质子化的PBSQ部分之间的强OH···O-离子氢键形成高度对称的一维氢键链。水合晶体的介电常数几乎与温度无关(e'~9),但氘化晶体表现出居里-魏斯型温度依赖性,并且在 28 K 时介电常数下降,这是(反)铁电相的特征过渡。因此,