Liquid crystal compounds and compositions.

摘要

Liquid crystal naphtalene compounds, represented by the following formula (1) are disclosed. R-Z-A-NAP-Z min -R min (1) In the formula (1), R is an alkyl group containing 1 to 18 carbon atoms; R min is an alkyl group containing 1 to 21 carbon atoms; NAP represents 2,6-naphthylene group; A, Z and Z min are as follows: 1) A is Pyr> and (a) Z is - or # and Z min is O, or (b) Z is - and Z min is COO; 2) if A is Pym>, (a) Z is - and Z min is O, or (b) Z is O and Z min is -, O or #; 3) A is FPhF and (a) Z is - or O and Z min is -, O or COO, (b) Z is OCO and Z min is - or O, or (c) Z is # and Z min is O; 4) A is PhF and (a) Z is - or # and Z min is O, (b) Z is O and Z min is -, or (c) Z is - and Z min is COO; 5) A is FPh and (a) Z is O and Z min is-, (b) Z is -, O, # or OCO and Z min is O, or (c) Z is O and Z min is COO; 6) A is <Pyr and Z is -, O or # and Z min is O; or 7) A is Ph and one of Z and Z min is - and the other is O; <CHEM> As a component of liquid crystal compositions showing chiral smectic C phase, these compounds can provide liquid crystal compositions of improved orientation and free from zigzag deffects, and liquid crystal display elements of high contrast ratio.