FLUORINATED FLUORENE DERIVATIVES

摘要

The invention relates to novel fluorinated fluorene derivatives with negative anisotropy of the dielectric constant, of formula 1, R<1> -(-A<1>-Z<1>-)k1-(A<2>-Z<2>-)k2-W-(-Z<3>-A3-)k3(-Z<4>-A<4>-)k4-R<2>, where W = partial formula (2), L<1>, L<2> independently = H, F, Cl, -CH2F, -CHF2, or -CF3, with the proviso that both L<1> and L<2> H, L<3>, L<4> 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>, k1, k2, k3 and k4 have the given meanings. The invention further relates to liquid crystal media, optical and electro-optical display elements.