title: Odd-Even Effect on Nematic SmAdPhase Boundary and SmAdStructure in Homologous Binary Systems of Cyanobiphenyl Mesogens: 4-Alkyl-4'-cyanobiphenyl (nCB) and 4-Alkoxy-4'-cyanobiphenyl (nOCB).
abstract: Phase behaviors of two homologous binary systems of 4-alkyl-4'-cyanobiphenyl (nCB, n being the number of carbon atoms in the alkyl chain) and 4-alkoxy-4'-cyanobiphenyl (nOCB) were investigated. Their phase diagrams were drawn against an averaged chain length, n*. The phase boundary curves between neamtic (N) and smectic Ad(SmAd) phases in nCB/mCB (n = 3-6; m = 8, 9) binary systems were classified into four depending on four combinations of even- and odd-numbered n and m; even/even, odd/even, even/odd, and odd/odd. The similar odd-even effect was confirmed for nOCB/mOCB (n = 5, 6; m = 8, 9) binary systems. To elucidate the odd-even effect on the phase diagrams, the SmAdstructures were investigated through an analysis of n (n*) dependence of the layer spacing of the SmAdstructure, dSmAd, of neat nCB (n = 8-10), neat nOCB (n = 8-10), and nCB/8CB (n = 0-7) binary mixtures. The odd-even effect, the behavior of 0CB/8CB system, and the difference between nCB and nOCB were clarified based on their SmAdstructures.
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Yasuhisa
authors.initials: Y
authors.lastname: Yamamura
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Rei
authors.initials: R
authors.lastname: Tsuchiya
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Shuhei
authors.initials: S
authors.lastname: Fujimura
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Mafumi
authors.initials: M
authors.lastname: Hishida
authors.affiliation: Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba , Tsukuba, Ibaraki 305-8571, Japan.
authors.forename: Kazuya
authors.identifier: 0000-0001-8065-0772
authors.initials: K
authors.lastname: Saito