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Abstract

The present invention relates to fluorescent diketopyrrolopyrrole analogues of the general formula (I), wherein A.sup.1 and A.sup.2 are C.sub.1 C.sub.18alkyl, C.sub.2 C.sub.18alkenyl, C.sub.2 C.sub.18alkynyl, C.sub.5 C.sub.8cycloalkyl, C.sub.5 C.sub.8cycloalkenyl, aryl or heteroaryl, A.sup.3 and A.sup.4 are independently of each other C.sub.1 C.sub.18alkyl, Ar.sup.3, --CR.sup.30R.sup.31--(CH.sub.2).sub.m--Ar.sup.3, or Y--R.sup.32, wherein R.sup.30 and R.sup.31 independently of each other stand for hydrogen or C.sub.1 C.sub.4alkyl, or phenyl which can be substituted up to three times with C.sub.1 C.sub.3alkyl, Ar.sup.3 stands for aryl, in particular phenyl or 1- or 2-naphthyl, C.sub.5 C.sub.8cycloalkyl, in particular cyclohexyl, or heteroaryl, which can be substituted one to three times with C.sub.1 C.sub.8alkyl, C.sub.1 C.sub.8alkoxy, halogen or phenyl, which can be substituted with C.sub.1 C.sub.8alkyl or C.sub.1 C.sub.8alkoxy one to three times, and m stands for 0, 1, 2, 3 or 4, Y is C(O)-- or SO.sub.2-- and R.sup.32 is C.sub.1 C.sub.18alkyl, Ar.sup.3, or aralkyl and A.sup.3 can additionally be hydrogen, C.sub.1 C.sub.8alkyloxycarbonyl, such as tertbutoxycarbonyl, or aralkyloxycarbonyl, such as benzyloxycarbonyl, a process for their preparation and their use for the preparation of inks, colourants, pigmented plastics for coatings, non-impact printing material, colour filters, cosmetics, polymeric ink particles, toners, dye lasers and electroluminescent devices, or as fluorescent markers for immunoassays and fluorescent tracers for leak detection of fluids. The diketopyrrolopyrrole analogues of the general formula I show a high solid state fluorescence ##STR00001##

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