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武汉工业学院 化学与环境工程学院,湖北 武汉,430023
Received:16 June 2011,
Revised:18 August 2011,
Published Online:20 December 2011,
Published:20 December 2011
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杜琼, 游红军, 汪晓燕, 张智勇, 戴志群. 弯曲型向列相液晶研究进展[J]. 液晶与显示, 2011,26(6): 719-726
DU Qiong, YOU Hong-jun, WANG Xiao-yan, ZHANG Zhi-yong, DAI Zhi-qun. Progress of Bent-Core Nematic Liquid Crystals[J]. , 2011,26(6): 719-726
弯曲型向列相液晶是近年来新发现的一类具有特殊光电性能的液晶材料。这类液晶分子具有独特的弯曲形状
表现出不同于棒状液晶的优良特性;但这些弯曲型向列相液晶分子普遍存在着熔点高
易出现宽温近晶相的问题。文章对以取代间苯二酚、萘环、噁二唑环等为中心环
酯键、碳(氮)氮双键等为桥键的弯曲型向列相液晶化合物的分子结构、特性、研究进展以及侧位取代对液晶性能的影响做了简要概述。
The bent-core nematic liquid crystals discovered in recent years is a new kind of liquid crystals with special electro-optical property. The molecules have the unique bent shape
performing great characteristics which are different from rod-like liquid crystals. However
these molecules with bent-core nematic commonly have high melting point and wide temperature range of smetic phases. This paper overviews the current state of research in the field of bent-core nematic liquid crystals of molecular structures
properties and the research situation of bent-core molecules with nematic phases based on the substituted resorcinol
naphthalene
oxadiazole etc as the central units and ester group
C=N (N=N) etc as the bridge bonds
and the influence of lateral substitution on the liquid crystal behavior was given.
Nori T, Sekine T, Watanable J, et al.Distinct ferroelectric smectic liquid crystals consisting of banana shaped achiral molecules [J]. J. Matter. Chem., 1996, 6(7):1231-1233.[2] 李建, 安忠维, 杨毅. TFT- LCD用液晶显示材料进展 [J]. 液晶与显示, 2002, 17(2):104-113.[3] 杨傅子. 近期液晶研究中的几个新方向-液晶非显示应用研究的基础 [J]. 物理学进展, 2008, 28(2):107-128.[4] Freemantle M. Liquid crystals align on two axes [J]. Chem. & Eng. News, 2004, 82 (16):6-7.[5] Tschierske C, Demetri J . Biaxial nematic liquid [J].J. Mater. Chem., 2010, 20(21):4263-4294.[6] 沈冬, 蔡良珍, 沈晶伟. 香蕉形非手性铁电(非铁电)液晶[J]. 液晶与显示, 2003, 18(6):414- 416.[7] Weissflog W, Nadasi H, Dunemann U, et al.Influence of lateral substituent on the behavior of banana-shaped mesogens [J]. J. Mater. Chem., 2001, 11(11):2748-275.[8] Freiser M J. Ordered states of a nematic liquid [J]. Phys. Rev. Lett., 1970, 24(19):1040-1043.[9] Camp P J, Allen M P, Masters A J. Theory and computer simulation of bent-core molecules [J]. J. Chem. Phys., 1999, 111(21):9871-9881.[10] Madsen L A, Dingemans T J, Nakata M, et al.Thermotropic biaxial nematic liquid crystals [J]. Phys. Rev. Lett., 2004, 92(14):145505(1-4).[11] Acharya B, Primak R A, Kumar S. Biaxial nematic phase in bent-core thermotropic mesogens [J]. Phys. Rev. Lett., 2004, 92(14):145506(1-4).[12] Prasad V, Kang S W, Suresh K A, et al. Thermotropic uniaxial and biaxial nematic and smetic phasesin bent-core mesogens[J].J.Am. Chem. Society, 2005, 127(49):17224-17227.[13] Cooper L L, Samulski E T. Towards room temperature biaxial nematics [J]. Mol. Cryst. Liq. Cryst., 2009, 511(1):203-217.[14] 黄佩, 胡兰萍, 沈冬. 噁二唑类弯曲液晶分子的合成[J]. 液晶与显示, 2010, 25(5):626- 634.[15] Luckhurst G R. V-shaped molecules:New contenders for the biaxial nematic phase [J]. Angew. Chem. Ind. Ed., 2005, 44 (19):2834-2836.[16] Semmler K J K, Dingemans T J, Samulsk E T. Biaxial smectic phases in non-linear optical properties and phase behaviour of an oxdiazole liquid crystal [J]. Liq.Cryst., 1998, 24(6):799-803.[17] Olivares J A, Stojadinovic S, Dingemans T, et al.Optical studies of the nematic phase of an oxazole-derived bent-core liquid crystal [J]. Phys. Rev. E:Stat., Nonlinear, Soft Matter Phys., 2003, 68(4):041704(1-4).[18] Weissflog W, Sokolowski S, Dehne H, et al.Chiral ordering in the nematic and an optically isotropic mesophase of bent-core mesogens with a halogen substituent at the central core [J]. Liq.Cryst., 2004, 31(7):923-933.[19] Pelzl G, Diele S, Grande S, et al.Structural and electro-optical investigations of the smectic phase of chlorine-substituted banana-shaped compounds [J]. Liq.Cryst., 1999, 26(3):401- 413.[20] Dunemann U, Reddy R A, Pelzl G, et al.The influence of lateral substituents on the mesophase behaviour of banana- shaped mesogens [J]. J. Mater. Chem., 2005, 15(37):4051-4061.[21] Stannarius R, Eremin A, Tamba M G, et al.Field-induced texture transitions in a bent-core nematic liquid crystal [J]. Phys. Rev. E, 2007, 76(6):061704(1-6).[22] Keith C, Lehmann A, Baumeister U, et al.Nematic phases of bent-core mesogens [J]. Soft Matter., 2010, 6(8):1704-1721.[23] Reddy R A, Sadashiva B K. Direct transition from a nematic phase to a polar biaxial smectic A phase in a homologous series of unsymmetrically substituted bent-core compounds [J]. J. Mater. Chem., 2004, 14(3):310-319.[24] Reddy R A, Sadashiva B K, Raghunathan V A. Banana-shaped mesogens derived from 2,7-dihydroxynaphthalene and 1,3-dihydroxybenzene; novel columnar mesophases [J]. Chem. Mater. , 2004, 16(21):4050-4062.[25] Novikova N S, Gorecka E, Kondratyeva R V, et al.New bent-shaped liquid crystalline derivatives of 2,7-dihydroxynaphthalene containing lateral bromine atoms [J]. Liq. Cryst., 2008, 35(6):743-757.[26] Kohout M, Svoboda J, Novotna V, et al.A nematic-polar columnar phase sequence in new bent-shaped liquid crystals based on a 7-hydroxynaphthalene-2-carboxylic acid core [J]. J. Mater .Chem., 2009, 19(20):3153-3160.[27] Shen D, Diele S, Pelzl G, et al.Designing banana-shaped liquid crystals without Schiff's base units:m-terphenyls, 2, 6-diphenylpyridines and V-shaped tolane derivatives [J]. J. Mater. Chem., 1999, 9(3):661-672.[28] Lee S K, Li X, Kang S, et al.Formation of banana phases in bent-shaped molecules with unusual bent angles as low as 60 [J]. J. Mater. Chem., 2009, 19(26):4517-4522.[29] Thisayukta J, Nakayama Y, Watanabe J. Effect of chemical structure on the liquid crystallinity of banana-shaped molecules [J]. Liq. Cryst., 2000, 27(9):1129-1135.[30] Niori T, Yamamoto J, Yokoyama H. Dynamics of the nematic phase formed by achiral banana-shaped materials [J]. Mol. Cryst. Liq. Cryst., 2004, 409(1):475-482.[31] Vaupotic N, Szydlowska J, Salamonczyk M, et al.Structure studies of the nematic phase formed by bent-core molecules [J]. Phys. Rev. E:Stat., Nonlinear, Soft Matter. Phys., 2009, 80(3):030701(1-6).[32] Nguyen H T, Rouillon J C, Marcerou J P, et al.Mesomorphic and electro-optical properties of new achiral banana-shaped molecules [J]. Mol. Cryst. Liq. Cryst., 1999, 328(1):177-184.[33] Mathews M, Kang S W, Kumar S, et al.Designing bent-core nematogens towards biaxial nematic liquid crystals [J]. Liq. Cryst., 2011, 38(1):31-40.[34] Reddy R A, Sadashiva B K. New phase sequences in banana-shaped mesogens:influence of fluorine substituent in compounds derived from 2, 7-dihydroxynaphthalene [J]. J. Mater. Chem., 2004, 14(13):1936-1947.[35] Prathiba R, Madhusudana N V, Sadashiva B K. An orientational transition of bent-core molecules in an anisotropic matrix [J]. Science, 2000, 288(5474):2184-2187.[36] Diele S, Pelzl G, Pancenko N, et al.Transitions between the B2 phase and more usual smectic phases in binary systems of banana-shaped with calamitic mesogens [J]. Liq. Cryst., 2002, 29(8):1039-1046.[37] Diele S, Pelzl G, Dunemann U, et al.Different nematic phases and a switchable SmcP phase formed by homologues of a new class of asymmetric bent-core mesogens [J]. J. Mater. Chem., 2003, 13(8):1877-1882.[38] Dunemann P U, Weissflog W. Mesophases of hockey stick mesogens [J]. Liq.Cryst., 2004, 31(5):633-637.[39] Yu F C, Yu L J. Mesophases of hockey stick mesogens [J]. Liq. Cryst., 2008, 35(7):799-813.[40] Novotna V, Zureka J, Kozmika V, et al.Novel hockey-stick mesogens with the nematic, synclinic and anticlinic smectic C phase sequence [J]. Liq. Cryst., 2008, 35(10):1023-1036.
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