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    • 8. 发明申请
    • POLAR TOLANE LIQUID CRYSTALS
    • 极性液体液晶
    • WO02020697A3
    • 2002-05-10
    • PCT/US2001/027194
    • 2001-08-30
    • G02F1/13C09K19/18C09K19/30C09K19/34C09K19/42C07C25/24C07C255/50C07C43/225
    • C09K19/3059C09K19/18C09K19/3402C09K2019/186C09K2019/3422
    • A new class of liquid crystal compounds is based on tolane and bis-tolane structures: (I), in which X is a polar group such as F (fluoro), CN (cyano), OCF3 (trifluoromethoxy), or NCS (isothiocyanate) at least one of the pairs of sites Y1 and Y2, Z1 and Z2, and for the bis-tolane derivatives, A1 and A2 are fluoro groups. T1 for the tolane derivatives is always a triple bond. For the bis-tolane derivatives, T1 and T2 are either both triple bonds or one of the two groups is a double bond with and the other remains a triple bond. Rn or Rm may be an alkyl group having the general formula CnH2n+1, an alkenyl group having the general formula CnH2n-1, an alkoxy group having the general formula OCnH2n+1, or an alkenoxy group having the general formula -OCnH2n-1. Additionally, for the tolane compounds, Rn may be a cyclohexyl substituent: (II), or a dioxane substituent: (III), in which Rx is an alkyl group having the general formula general formula CxH2x+1, an alkenyl group having the general formula CxH2x-1, an alkoxy group having the general formula OCxH2x+1, or an alkenoxy group having the general formula OCxH2x-1. These compounds exhibit useful nematic ranges and melting points. Also disclosed are eutectic mixtures including these compounds.
    • 一类新的液晶化合物是以甲苯和双甲苯结构为基础的:(I)其中X为极性基团如氟(氟),CN(氰基),OCF 3(三氟甲氧基)或NCS(异硫氰酸酯) 一对位点Y1和Y2,Z1和Z2中的至少一个以及双甲苯衍生物A1和A2是氟基团。 甲苯衍生物的T1总是三重键。 对于双甲苯衍生物,T1和T2既可以是三重键,也可以是两个基团中的一个是双键,另一个保持三键。 Rn或Rm可以是具有通式CnH2n + 1的烷基,具有通式CnH2n-1的烯基,具有通式OCnH2n + 1的烷氧基或具有通式-OCnH 2 n-1的链烯氧基 。 此外,对于甲苯化合物,R n可以是环己基取代基:(II)或二恶烷取代基:(III),其中R x是具有通式C x H 2 x + 1的通式的烷基,具有通式 式CxH2x-1,具有通式OCxH2x + 1的烷氧基或具有通式OCxH2x-1的烯氧基。 这些化合物表现出有用的向列范围和熔点。 还公开了包括这些化合物的共晶混合物。