Fluorinated indenes and 1,7-dihydroindacenes of negative dielectric anisotrophy

An indene or 1,7-dihydroindacene compounds of formulae (I) and (II), having a negative dielectric anisotropy:

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• wherein:
• T is in each case, independently of one another,
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• A is in each case, independently of one another, 1,4-phenylene, in which one or two ═CH— groups are each, optionally, replaced by ═N—, and which is unsubstituted or monosubstituted to tetrasubstituted, independently of one another, by halogen, —CN, —CH3, —CH2F, —CHF2, —CF3, —OCH3, —OCH2F, —OCHF2 or —OCF3, or is 1,4-cyclohexylene, 1,4-cyclohexenylene or 1,4-cyclohexadienylene, in which one or two —CH2— groups are each, optionally, independently of one another, replaced by —O— or —S—, and which is unsubstituted or mono- or polysubstituted by halogen;
• R is in each case, independently of one another, hydrogen, or is alkyl having 1 to 15 carbon atoms, alkoxy having 1 to 15 carbon atoms, alkenyl having 2 to 15 carbon atoms or alkynyl having 2 to 15 carbon atoms, which in each case is unsubstituted, monosubstituted by —CF3 or at least monosubstituted by halogen, an wherein one or more CH2 groups are, optionally, each, independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, or is halogen, —CN, —SCN, —NCS, —SF5, —CF3, —OCF3, —OCHF2 or —OCH2F;
• L is hydrogen or halogen;
• X is hydrogen, or
• is alkyl having 1 to 15 carbon atoms, alkoxy having 1 to 15 carbon atoms, alkenyl having 2 to 15 carbon atoms or alkynyl having 2 to 15 carbon atoms, which in each case is unsubstituted, monosubstituted by —CF3 or at least monosubstituted by halogen, and wherein one or more CH2 groups are, optionally, each, independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent, or is halogen, —CN, —SCN or —NCS;
• Y, U and W, independently of one another, are each hydrogen, or are alkyl having 1 to 15 carbon atoms, alkoxy having 1 to 15 carbon atoms, alkenyl having 2 to 15 carbon atoms or alkynyl having 2 to 15 carbon atoms, which in each case is unsubstituted, monosubstituted by —CF3 or at least monosubstituted by halogen, and wherein one or more CH2 groups are, optionally, each, independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO— or —OCO—O— in such a way that heteroatoms are not directly adjacent;
• Z is in each case, independently of one another, a single bond, —CF2O—, —OCF2—, —CH2CH2—, —CF2CF2—, —C(O)O—, —OC(O)-, —CH2O—, —OCH2—, —CF═CH—, —CH═CF—, —CF═CF—, —CH═CH— or —C≡C—;
• n and m, independently of one another, are 0, 1, 2 or 3,
• p and q, independently of one another, are 0, 1, 2 or 3,
• with the proviso that, in the formula (I), L is —F if
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• and p and q are each 0.