Liquid crystalline medium

摘要

Fluorinated pyran liquid crystalline compounds are new. Fluorinated pyran liquid crystalline compounds (I) of formula (1) are new. Ra = H, 1-12C alkyl optionally monosubstituted by CN or CF3 or at least monohalogenated and optionally having CH2 groups replaced by -O-, -S-, 1,4-cyclobutyl, -CHCH-, -CC-, -CO-, -CO-O- or -O-CO-O- such that O atoms are not directly bonded to each other; A, B = formula (2)-(8) whereby at least one ring is of formula (6)-(8); L1, L2 = H or F; Y = F, Cl, SF5, NCS, OCN, SCN or 1-5C alkyl, alkoxy, alkenyl or alkenyloxy optionally at least monohalogenated; Z1, Z2 = -CH2CH2-, -(CH2)4-, -CH2O-, -OCF2-, -CC-, -CFCF-, -CHCH-, -COO-, -CH2-, -(CH2)3- or a single bond. Independent claims are included for: (1) a liquid crystal medium (II) comprising at least one compound (I) of formula (1) and at least one compound of formula (9) and; (2) an optoelectronic liquid crystal display containing the medium (II). Rb = Ra; L3-L9 = H or F.