Tetralin compound, liquid crystal material, liquid crystal composition and liquid crystal element

A liquid crystal material comprising a tetralin compound represented by the following formula [I]:

• R'X'A.sup.1 --Y.sup.1 --A.sup.2 --(Y.sup.2 --A.sup.3).sub.n --Z--R* [I]
• wherein
• R is an alkyl group of 3-20 carbon atoms,
• X is --O--CO--, --O-- or a single bond,
• n is 0 or 1, and
• when n is 0, one of A.sup.1 and A.sup.2 is ##STR137## and the residual A.sup.1 or A.sup.2 is a group selected from the group consisting of ##STR138## and when n is 1, one of A.sup.1 A.sup.2 and A.sup.3 is ##STR139## and the residual two of A.sup.1 A.sup.2 and A.sup.3 are 1,4-phenylene group,
• Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- and --OCH.sub.2 --,
• Z is --O--, --O--CO-- or a single bond, and
• R* is a group selected from the group consisting of --C*H (CF.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--CsH.sub.11, --C*H(C.sub.2 H.sub.5)CsH.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.6 H.sub.13, --CH.sub.2 --C*H(CH.sub.3)--C.sub.2 H.sub.5, --(CH.sub.2).sub.3 --C*H(CH.sub.3)--C.sub.2 H.sub.5 and --C*H (CF.sub.3) --CH.sub.2 --COO--C.sub.2 H.sub.5.

A liquid crystal composition comprising a tetralin compound represented by the following formula [I]:

• R--X--A.sup.1 --Y.sup.1 --A.sup.2 --(Y.sup.2 --A.sup.3).sub.n --Z--R* [I]
• wherein
• R is an alkyl group of 3-20 carbon atoms,
• X is --O--CO--, --O-- or a single bond,
• n is 0 or 1, and
• when n is 0, one of A.sup.1 and A.sup.2 is ##STR140## and the residual A.sup.1 or A.sup.2 is a group selected from the group consisting of ##STR141## and when n is 1, one of A.sup.1 A.sup.2 and A.sup.3 is ##STR142## and the residual two of A.sup.1 A.sup.2 and A.sup.3 are 1,4-phenylene group,
• Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- and --OCH.sub.2 --,
• Z is --O--, --O--CO-- or a single bond, and
• R* is a group selected from the group consisting of --C*H (CF.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.6 H.sub.13, --CH.sub.2 --C*H(CH.sub.3)--C.sub.2 H.sub.5, --(CH.sub.2).sub.3 --C*H(CH.sub.3)--C.sub.2 H.sub.5 and C*H(CF.sub.3) CH.sub.2 --COO'C.sub.2 H.sub.5, and
• a liquid crystal compound other than the tetralin compound.

A liquid crystal element comprising a cell and a liquid crystal material, said cell comprising two substrates facing to each other and a gap formed by the substrates, said liquid crystal material being filled in the gap of the cell, in which

• the liquid crystal material comprises a tetralin compound represented by the following formula [I]:
• R--X--A.sup.1 --Y.sup.1 --A.sup.2 --(Y.sup.2 --A.sup.3).sub.n --Z--R* [I]
• wherein
• R is an alkyl group of 3-20 carbon atoms,
• X is --O--CO--, --O-- or a single bond,
• n is 0 or 1, and
• when n is 0, one of A.sup.1 and A.sup.2 is ##STR143## and the residual A.sup.1 or A.sup.2 is a group selected from the group consisting of ##STR144## and when n is 1, one of A.sup.1 A.sup.2, and is A.sup.3 is ##STR145## and the residual two of A.sup.1, A.sup.2 and A.sup.3 are 1,4-phenylene group,
• Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- and --OCH.sub.2 --,
• Z is --O--, --O--CO-- or a single bond, and
• R* is a group selected from the group consisting of --C*H(CF.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5) C.sub.5 H.sub.11, --C*H (C.sub.2 H.sub.5)--C.sub.6 H.sub.13, --CH.sub.2 -- C*H (CH.sub.3)--C.sub.2 H.sub.5, --(CH.sub.2).sub.3 --C*H(CH.sub.3)--C.sub.2 H.sub.5 and --C*H(CF.sub.3)--CH.sub.2 --COO--C.sub.2 H.sub.5.

A liquid crystal element comprising a cell and a liquid crystal composition, said cell comprising two substrates facing to each other and a gap formed by the substrates, said liquid crystal material being filled in the gap of the cell, in which

• the liquid crystal material comprises a tetralin compound represented by the following formula [I]:
• R--X--A.sup.1 --Y.sup.1 --A.sup.2 --(Y.sup.2 --A.sup.3).sub.n --Z--R* [I]
• wherein
• R is an alkyl group of 3-20 carbon atoms,
• X is --O--CO--, --O-- or a single bond,
• n is 0 or 1, and
• when n is 0, one of A.sup.1 and A.sup.2 is ##STR146## and the residual A.sup.1 or A.sup.2 is a group selected from the group consisting of ##STR147## and when n is 1, one of A.sup.1 , A.sup.2 and A.sup.3 is ##STR148## and the residual two of A.sup.1 A.sup.2 and A.sup.3 are 1,4-phenylene group,
• Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- and --OCH.sub.2 --,
• Z is --O--, --O--CO-- or a single bond, and
• R* is a group selected from the group consisting of --C*H(CF.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.6 H.sub.13, --C*H(CH)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.6 H.sub.13, --CH.sub.2 --C*H(CH.sub.3)--C.sub.2 H.sub.5, --(CH.sub.2).sub.3 --C*H(CH.sub.3)--C.sub.2 H.sub.5 and --C*H(CF.sub.3) --CH.sub.2 --COO--C.sub.2 H.sub.5, and
• a liquid crystal compound other than the tetralin compound.

A tetralin compound represented by the following formula (I):

• R--X--A.sup.1 --Y.sup.1 --A.sup.2 --Z--R* (I)
• wherein
• R is an alkyl group of 3-20 carbon atoms,
• X is --O--CO--, --O-- or a single bond,
• one of A.sup.1 and A.sup.2 is ##STR149## and the residual A.sup.1 or A.sup.2 is a group selected from the group consisting of ##STR150## Y.sup.1 is a group selected from the group consisting of --COO--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- and --OCH.sub.2,
• Z is --O--, --O--CO-- or a single bond, and
• R* is a group selected from the group consisting of --C*H(CF.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.6 H.sub.13, --CH.sub.2 --C*H(CH.sub.3)--C.sub.2 H.sub.5, --(CH.sub.2).sub.3 --C*H(CH.sub.3)--C.sub.2 H.sub.5 and --C*H(CF.sub.3)--CH.sub.2 --COO--C.sub.2 H.sub.5.

A tetralin compound represented by the following formula (I):

• R--X--A.sup.1 --Y.sup.1 --A.sup.2 --(Y.sup.2 --A.sup.3).sub.n --Z--R* (I)
• wherein
• R is an alkyl group of 3-20 carbon atoms,
• X is --O--CO--, --O-- or a single bond,
• n is 1, one of A.sup.1, A.sup.2 and A.sup.3 is ##STR152## and the residual two of A.sup.1, A.sup.2, and A.sup.3 are 1,4-phenylene group,
• Y.sup.1 and Y.sup.2 are each independently a group selected from the group consisting of --COO--, --O--CO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 O-- and --OCH.sub.2,
• Z is --O--, --O--CO-- or a single bond, and
• R is a group selected from the group consisting of --C*H(CF.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.6 H.sub.13, --C*H(CH.sub.3)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.5 H.sub.11, --C*H(C.sub.2 H.sub.5)--C.sub.6 H.sub.13, --CH.sub.2 --C*H(CH.sub.3)--C.sub.2 H.sub.5, --(CH.sub.2).sub.3)--C.sub.2 H.sub.5 and --C*H(CF.sub.3)--CH.sub.2 --COO--C.sub.2 H.sub.5.