| 摘要 |
<p>A liquid crystal compound selected from a group of compounds represented by formula (a):
<Chemistry id="chema01" num="0001"><Image id="ia01" he="26" wi="132" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" /></Chemistry>
wherein Ra and Rb are each independently hydrogen, alkyl having 1 to 10 carbons or alkenyl having 2 to 10 carbons, provided that in the alkyl, -CH<Sub>2</Sub>- may be replaced by -O-, but plural -O- are not adjacent to each other, and hydrogen may be replaced by fluorine; ring A<Sup>1</Sup> and ring A<Sup>2</Sup> are each independently trans-1,4-cyclohexylene or 1,4-phenylene, provided that one or two hydrogens of the 1,4-phenylene may be replaced by halogen, and in a 6-membered ring of these groups, one -CH<Sub>2</Sub>- or two -CH<Sub>2</Sub>- that are not adjacent to each other may be replaced by -O-, and one or two -CH= may be replaced by -N=; Z<Sup>1</Sup> and Z<Sup>2</Sup> are each independently a single bond, -(CH<Sub>2</Sub>)<Sub>2</Sub>-, -(CH<Sub>2</Sub>)<Sub>4</Sub>-, -CH=CH-, -C≡C-, -CH<Sub>2</Sub>O- -OCH<Sub>2</Sub>-,-COO-, -OCO- or -OCF<Sub>2</Sub>-; 1 and m are each independently 0, 1 or 2, provided that 1+m is 0, 1, 2 or 3; and n is an integer of from 0 to 6, provided that in -(CH<Sub>2</Sub>)<Sub>n</Sub>-, -CH<Sub>2</Sub>- may be replaced by -O-, but plural -O- are not adjacent to each other, and hydrogen may be replaced by fluorine.</p> |
