Odd−Even Behavior of Ferroelectricity and Antiferroelectricity in Two Homologous Series of Bent-Core Mesogens
作者:Seng Kue Lee、Sung Heo、Jong Gun Lee、Kyung-Tae Kang、Kazuya Kumazawa、Koushi Nishida、Yoshio Shimbo、Yoichi Takanishi、Junji Watanabe、Takayuki Doi、Takashi Takahashi、Hideo Takezoe
DOI:10.1021/ja052315q
日期:2005.8.1
behavior for the alternative appearance of ferroelectricity and antiferroelectricity was observed in two homologous series; the bent-core mesogens P10-O-PIMB8*, P8-O-PIMB6*-4O, and P10-O-PIMB8*-6O in addition to the previously reported P6-O-PIMB4* and P8-O-PIMB6*, where the length of chains n is even, exhibited ferroelectric phases. On the contrary, the mesogens P7-O-PIMB5*, P9-O-PIMB7*, and P9-O-PIMB7*-5O
两个手性弯曲核介晶 Pn-O-PIMB(n - 2)* (n = 9 和 10) 及其氧类似物 Pn-O-PIMB(n - 2)*-(n - 4)O (n = 8) , 9, 和 10) 具有ω-[(S)-戊氧基]烷氧基端基,并通过电光、极化反转电流和二次谐波产生测量研究它们的相结构,以阐明其影响极序出现时的层间空间相互作用。在两个同源系列中观察到铁电性和反铁电性交替出现的奇偶行为;除了先前报道的 P6-O-PIMB4* 和 P8-O-PIMB6* 之外,弯曲核介晶 P10-O-PIMB8*、P8-O-PIMB6*-4O 和 P10-O-PIMB8*-6O,其中链的长度 n 是偶数,表现出铁电相。相反,介晶 P7-O-PIMB5*、P9-O-PIMB7*、和 P9-O-PIMB7*-5O,其中 n 是奇数,显示出反铁电相。很明显,层间空间相互作用对各种相结构的出现起着重要作用。