Proton transfer and a dielectric phase transition in the molecular conductor (HDABCO+)2(TCNQ)3
Proton transfer and a dielectric phase transition in the molecular conductor (HDABCO+)2(TCNQ)3
复制标题
DOI：
10.1021/ja0377697
复制
发表时间：
2004-01-14
影响因子：
15
通讯作者：
Nakamura, T
中科院分区：
文献类型：
--
作者：
Akutagawa, T;Takeda, S;Nakamura, T
一维电介质（N. H...将单质子化的1，4-二氮杂双环[2.2.2]辛烷（HDABCOdagger）的N）（无穷大）氢键链引入导电的7，7，8，8-四氰基对苯醌二甲烷（TCNQ）盐中作为抗衡阳离子结构。室温电导率接近10（-3）S·cm（-1），具有较好的稳定性。（HDABCO（+））（2）（TCNQ）（3）的介电常数随温度的变化表明在306 K时发生介电转变。对于氘代盐（DDABCO（+））（2）（TCNQ）（3），观察到介电转变的大的氘同位素效应（Δ T = 70 K）。（HDABCO（+））（无穷大）和（DDABCO（+））（无穷大）的一维氢键链内的质子或氘的热激活有序/无序影响TCNQ基半导体中的介电响应。
One-dimensional dielectric (N...H...N)(infinity) hydrogen-bonding chains of monoprotonated 1,4-diazabicyclo[2.2.2] octane (HDABCOdagger) were Introduced Into an electrically conducting 7,7,8,8-tetracyano-P-quinodimethane (TCNQ) salt as the countercation structure. Room-temperature electrical conductivity Was similar to10(-3) S cm(-1), with a semiconductive behavior. The temperature-dependent dielectric constants of (HDABCO(+))(2)(TCNQ)(3) indicated a dielectric transition at 306 K. A large deuterium Isotope effect for the dielectric transition (DeltaT = 70 K) was observed for the deuterated salt, (DDABCO(+))(2)(TCNQ)(3), Thermally activated order/disorder of the protons or deuteriums within the one-dimensional hydrogen-bonding chains of (HDABCO(+))(infinity) and (DDABCO(+))(infinity) affected the dielectric responses in the TCNQ-based semiconductors.