Aromatic isothiocyanates

A compound of formula T

• in which
• X denotes SF5, SF5—C≡C— or SF5—O—;
• ZT1, ZT2 identically or differently, denote —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C≡C—, —C≡C—C≡C— or a single bond;
• denote 1,4-phenylene, 1,4-naphthylene, 2,6-naphthylene, tetralin-5,8-diyl, thiophene-2,5-diyl, thieno[3,2-b]thiophene-2,5-diyl or selenophene-2,5-diyl, in which one or two CH groups may be replaced by N and in which one or more H atoms may be replaced by L;
• L on each occurrence, identically or differently, denotes F, Cl, CN, SCN, SF5 or straight-chain or branched, in each case optionally fluorinated, alkyl, alkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy or alkoxycarbonyloxy each having 1 to 12 C atoms;
• and
• t is 0, 1 or 2.