title: Odd-even behavior of ferroelectricity and antiferroelectricity in two homologous series of bent-core mesogens.
abstract: Two chiral bent-core mesogens Pn-O-PIMB(n - 2)* (n = 9 and 10) and their oxygen analogues Pn-O-PIMB(n - 2)*-(n - 4)O (n = 8, 9, and 10) with omega-[(S)-amyloxy]alkoxy terminal groups were prepared, and their phase structures were investigated by means of electro-optic, polarization reversal current and second harmonic generation measurements in order to clarify the effect of the interlayer steric interaction on the emergence of polar orderings. The odd-even 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, where n is odd, showed antiferroelectric phases. It is obvious that the interlayer steric interaction plays a major role for the emergence of a variety of phase structures.
authors.affiliation: Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Pusan 609-735, Korea.
authors.forename: Seng Kue
authors.initials: SK
authors.lastname: Lee
authors.forename: Sung
authors.initials: S
authors.lastname: Heo
authors.forename: Jong Gun
authors.initials: JG
authors.lastname: Lee
authors.forename: Kyung-Tae
authors.initials: KT
authors.lastname: Kang
authors.forename: Kazuya
authors.initials: K
authors.lastname: Kumazawa
authors.forename: Koushi
authors.initials: K
authors.lastname: Nishida
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Shimbo
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Takanishi
authors.forename: Junji
authors.initials: J
authors.lastname: Watanabe
authors.forename: Takayuki
authors.initials: T
authors.lastname: Doi
authors.forename: Takashi
authors.initials: T
authors.lastname: Takahashi
authors.forename: Hideo
authors.initials: H
authors.lastname: Takezoe