Isothiocyanato-tolanes

A compound of formula T

• in which
• RT denotes halogen, CN, NCS, RF, RF—O— or RF—S—, wherein RF denotes fluorinated alkylorfluorinated alkenyl having 1 to 12 C atoms,
• on each occurrence, independently of one another, denote
• where
• alternatively denote
• in which one or two H atoms, identically or differently, are optionally replaced by a radical L1;
• L1 and L2 identically or differently, denote F, Cl or straight chain or branched or cyclic alkyl or alkenyl each having 1 to 12 C atoms;
• ZT1, ZT2 identically or differently, denote —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH—, —C≡C— or a single bond, wherein at least one of ZT1 and ZT2 denotes —CH═CH—, —CF═CF—, —CH═CF—, —CF═CH— or —C≡C—, and
• t is 0 or 1.