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.