Silicon-containing compound, liquid-crystal composition and liquid-crystal display using the same

A silicon-containing compound represented by Formula (I):

• wherein
• K represents
• R1 represents fluorine, chlorine, hydrogen, a C1-C20 linear alkyl group, a C3-C20 branched alkyl group, a C1-C20 linear alkoxy group, or a C3-C20 branched alkoxy group, wherein the C1-C20 linear alkyl group, the C3-C20 branched alkyl group, the C1-C20 linear alkoxy group, or the C3-C20 branched alkoxy group is unsubstituted or at least one —CH2— of the C1-C20 linear alkyl group, the C3-C20 branched alkyl group, the C1-C20 linear alkoxy group, or the C3-C20 branched alkoxy group is substituted by —SiRa2—, —C≡C—, —CH═CH—, —CF2O—, —O—, —COO—, —OCO—, or —OOC—, and/or at least one hydrogen atom of the C1-C20 linear alkyl group, the C3-C20 branched alkyl group, the C1-C20 linear alkoxy group, or the C3-C20 branched alkoxy group is substituted by a halogen atom, and wherein Ra represents a C1-C10 linear alkyl group or a C3-C10 branched alkyl group, and two Ra groups bonded to the same Si atom are identical to each other or different from each other;
• each of A1, A2, A3 and A4 independently represents a 1,4-phenylene group, a 1,4-cyclohexylene group, a benzofuran-2,5-diyl group, a 1,3-dioxane-2,5-diyl group, a tetrahydropyran-2,5-diyl group, a divalent dioxabicyclo[2.2.2]octylene group, a divalent trioxabicyclo[2.2.2]octylene group, a tetrahydronaphthalene-2,6-diyl group, or a indane-2,5-diyl group, wherein the 1,4-phenylene group, the 1,4-cyclohexylene group, the tetrahydronaphthalene-2,6-diyl group, or the indane-2,5-diyl group is unsubstituted or at least one hydrogen atom of the 1,4-phenylene group, the 1,4-cyclohexylene group, the tetrahydronaphthalene-2,6-diyl group, or the indane-2,5-diyl group is substituted by a halogen atom or a CN group, and/or at least one —CH2— of the 1,4-phenylene group, the 1,4-cyclohexylene group, the tetrahydronaphthalene-2,6-diyl group, or the indane-2,5-diyl group is substituted by —O—, —N— or —S—, and wherein the —O—, —N—, and —S— do not directly bond to one another;
• each of Z1, Z2, and Z3 independently represents a single bond, —CH2—CH2—, —C≡C—, —CH═CH—, —CF2O—, —OCF2—, —CH2O—, —OCH2—, —COO—, —OCO—, —OOC—, —CF2—CF2—, or —CF═CF—;
• each of L1, L2, L3, L4, L5, L6, L7, L8 and L9 independently represents a single bond, a C1-C15 linear alkylene group, a C3-C15 branched alkylene group, a C1-C15 linear alkyleneoxy group, or a C3-C15 branched alkyleneoxy group, wherein the C1-C15 linear alkylene group, the C3-C15 branched alkylene group, the C1-C15 linear alkyleneoxy group, or the C3-C15 branched alkyleneoxy group is unsubstituted or at least one —CH2— of the C1-C15 linear alkylene group, the C3-C15 branched alkylene group, the C1-C15 linear alkyleneoxy group, or the C3-C15 branched alkyleneoxy group is substituted by —C≡C—, —CH═CH—, —CF2O—, —O—, —COO—, —OCO—, or —OOC—, and/or at least one hydrogen atom of the C1-C15 linear alkylene group, the C3-C15 branched alkylene group, the C1-C15 linear alkyleneoxy group, or the C3-C15 branched alkyleneoxy group is substituted by a halogen atom, and wherein L4, L5, L6, L7 and L9 are unsubstituted or at least one carbon atom of L4, L5, L6, L7 and L9 is substituted by a silicon atom;
• each of X1, X2, X3, X4, X5, X6, and X7 independently represents hydrogen, —OH,
• or any one of the following:
• wherein Y1 represents —OH, hydrogen, a C1-C15 alkyl group, or a C2-C15 alkenyl group, and the C1-C15 alkyl group or the C2-C15 alkenyl group is unsubstituted or at least one hydrogen atom of the C1-C15 alkyl group or the C2-C15 alkenyl group is substituted by —OH or any one of the following:
• each of Y2 and Y3 independently represents hydrogen, halogen, a C1-C15 alkyl group, or a C2-C15 alkenyl group, wherein the C1-C15 alkyl group or the C2-C15 alkenyl group is unsubstituted or at least one hydrogen atom of the C1-C15 alkyl group or the C2-C15 alkenyl group is substituted by a halogen atom;
• each of Rb, Rc, and Rd independently represents fluorine, chlorine, hydrogen, a C1-C10 linear alkyl group, a C3-C10 branched alkyl group, a C1-C10 linear alkoxy group, or a C3-C10 branched alkoxy group, wherein the C1-C10 linear alkyl group, the C3-C10 branched alkyl group, the C1-C10 linear alkoxy group, or the C3-C10 branched alkoxy group is unsubstituted or at least one —CH2— of the C1-C10 linear alkyl group, the C3-C10 branched alkyl group, the C1-C10 linear alkoxy group, or the C3-C10 branched alkoxy group is substituted by —CH═CH—, —CF2O—, —O—, —COO—, —OCO—, or —OOC—, and/or at least one hydrogen atom of the C1-C10 linear alkyl group, the C3-C10 branched alkyl group, the C1-C10 linear alkoxy group, or the C3-C10 branched alkoxy group is substituted by a halogen atom;
• wherein at least one of X1, X2, X3, X4, X5, X6, and X7 represents —OH or any one of the following:
• wherein Y1 represents —OH, a C1-C15 alkyl group, or a C2-C15 alkenyl group, and wherein at least one hydrogen atom of the C1-C15 alkyl group or the C2-C15 alkenyl group is substituted by —OH or any one of the following:
• wherein at most two of X, X2, X3, X4, X5, X6, and X7 represents —OH;
• wherein when R1 does not comprise silicon, K represents
• each of n1, n2, n3, and n4 independently represents 0 or 1, and wherein at least one of n1, n2, n3, and n4 does not represent 0;
• and
• wherein in the Formula (I), a silicon atom does not directly bond to another silicon atom, and a silicon atom does not directly bond to an oxygen atom.