Development of Polar Order in the Liquid Crystal Phases of a 4-Cyanoresorcinol-Based Bent-Core Mesogen with Fluorinated Azobenzene Wings

被引:30
作者
Alaasar, Mohamed [1 ,2 ]
Prehm, Marko [1 ]
Tamba, Maria-Gabriela [3 ]
Sebastian, Nerea [3 ]
Eremin, Alexey [3 ]
Tschierske, Carsten [1 ]
机构
[1] Univ Halle Wittenberg, Inst Chem, Organ Chem, Kurt Mothes Str 2, D-06120 Halle, Germany
[2] Cairo Univ, Fac Sci, Dept Chem, Giza, Egypt
[3] Univ Magdeburg, Inst Expt Phys, Univ Pl 2, D-39106 Magdeburg, Germany
关键词
azobenzene; bent-core liquid crystals; deVries phase; ferroelectricity; mirror symmetry breaking; CHIRAL DOMAINS; SMECTIC PHASE; FIELD; ANTIFERROELECTRICITY; TRANSITION; MESOPHASES; BEHAVIOR; TILT;
D O I
10.1002/cphc.201500891
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A bent-core mesogen consisting of a 4-cyanoresorcinol unit as the central core and laterally fluorinated azobenzene wings forms four different smectic LC phase structures in the sequence SmA-SmCs-SmCsPAR-M, all involving polar SmCsPS domains with growing coherence length of tilt and polar order on decreasing temperature. The SmA phase is a cluster-type deVries phase with randomized tilt and polar direction; in the paraelectric SmCs phase the tilt becomes uniform, although polar order is still short-range. Increasing polar correlation leads to a new tilted and randomized polar smectic phase with antipolar correlation between the domains (SmCsPAR) which then transforms into a viscous polar mesophase M. As another interesting feature, spontaneous symmetry breaking by formation of a conglomerate of chiral domains is observed in the non-polar paraelectric SmCs phase.
引用
收藏
页码:278 / 287
页数:10
相关论文
共 67 条
[41]   Liquid crystal display modes in a nontilted bent-core biaxial smectic liquid crystal [J].
Nagaraj, Mamatha ;
Panarin, Y. P. ;
Vij, J. K. ;
Keith, C. ;
Tschierske, C. .
APPLIED PHYSICS LETTERS, 2010, 97 (21)
[42]   Distinct ferroelectric smectic liquid crystals consisting of banana shaped achiral molecules [J].
Niori, T ;
Sekine, T ;
Watanabe, J ;
Furukawa, T ;
Takezoe, H .
JOURNAL OF MATERIALS CHEMISTRY, 1996, 6 (07) :1231-1233
[43]   Orientational Fluctuations Near the Smectic A to Smectic C Phase Transition in Two "de Vries"-Type Liquid Crystals [J].
Nonnenmacher, Dorothee ;
Jagiella, Stefan ;
Song, Qingxiang ;
Lemieux, Robert P. ;
Giesselmann, Frank .
CHEMPHYSCHEM, 2013, 14 (13) :2990-2995
[44]   Twist grain boundary (TGB) states of chiral liquid crystalline bent-core mesogens [J].
Ocak, Hale ;
Bilgin-Eran, Belkiz ;
Guzeller, Dilek ;
Prehm, Marko ;
Tschierske, Carsten .
CHEMICAL COMMUNICATIONS, 2015, 51 (35) :7512-7515
[45]   Sequence of Four Orthogonal Smectic Phases in an Achiral Bent-Core Liquid Crystal: Evidence for the SmAPα Phase [J].
Panarin, Y. P. ;
Nagaraj, M. ;
Sreenilayam, S. ;
Vij, J. K. ;
Lehmann, A. ;
Tschierske, C. .
PHYSICAL REVIEW LETTERS, 2011, 107 (24)
[46]   Field-induced transformations in the biaxial order of non-tilted phases in a bent-core smectic liquid crystal [J].
Panarin, Y. P. ;
Nagaraj, Mamatha ;
Vij, J. K. ;
Keith, C. ;
Tschierske, C. .
EPL, 2010, 92 (02)
[47]  
Pelzl G, 1999, ADV MATER, V11, P707, DOI 10.1002/(SICI)1521-4095(199906)11:9<707::AID-ADMA707>3.0.CO
[48]  
2-D
[49]  
Pelzl G., 2007, Thermotropic Liquid Crystals: Recent Advances, P1, DOI DOI 10.1007/1-4020-5354-1_1
[50]   Paraelectric-antiferroelectric phase transition in achiral liquid crystals [J].
Pociecha, D ;
Gorecka, E ;
Cepic, M ;
Vaupotic, N ;
Gomola, K ;
Mieczkowski, J .
PHYSICAL REVIEW E, 2005, 72 (06)