| abstract |
The present invention relates to a compound represented by the formula 1, R 1 -(-A 1 -Z 1- ) k 1- (A 2 -Z 2- ) k 2 -W-(-Z 3 -A 3- ) k 3 (-Z 4 -A 4) −) K4 −R 2 , where W = sub-expression (2) Embedded image And L 1 and L 2 are independently ＨH, F, Cl, —CH 2 F, —CHF 2 or —CF 3 , provided that L 1 and L 2 are not both H, L 3 and L 4 are independently ＝ H or F, and R 1 , R 2 , A 1 , A 2 , A 3 , A 4 , Z 1 , Z 2 , Z 3 , Z 4 , k 1, k2, k3, and k4 have a predetermined meaning and relate to a novel fluorinated fluorene derivative having a negative anisotropy of a dielectric constant represented by: The invention further relates to liquid crystal media, optical and electro-optical display elements. |