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Abstract

The invention relates to chemiluminescent compounds of general formula: (I) wherein: either: R.sub.1 is a reactive group capable of reacting with an amine or thiol moiety; L.sub.1 is a hydrocarbon linker moiety comprising 2-12 carbon atoms, optionally substituted with hydroxy, halo, nitro or C.sub.1-C.sub.4 alkoxy; and R.sub.2is hydrogen, C.sub.1-C.sub.4 alkyl, C.sub.1-C.sub.4 haloalkyl, aryl, fused aryl, C.sub.1-C.sub.4 alkoxy, C.sub.1-C.sub.4acyl, halide, hydroxy or nitro; or, alternatively: the combination R.sub.1-L.sub.1- comprises a C.sub.1-C.sub.4 alkyl group optionally substituted with hydroxy, halo, nitro or C.sub.1-C.sub.4 alkoxy; and R.sub.2 comprises a group R.sub.4-L.sub.1-, where R.sub.4 is a reactive group capable of reacting with an amine or thiol moiety; and L.sub.1 is as defined above; L.sub.2 is --C(.dbd.O)O--, --C(.dbd.O)--S--or --C(.dbd.O)N(SO.sub.2R.sub.5)--, wherein, in each case, the --C(.dbd.O) is linked to the ring carbon atom, and R.sub.5 is C.sub.1-C.sub.8 alkyl, aryl, C.sub.1-C.sub.8 alkoxy or C.sub.1-C.sub.8 acyl; R.sub.3 a substituted C.sub.1-C.sub.8 alkyl, C.sub.2-C.sub.8 alkenyl, C.sub.1-C.sub.8 alkynyl or aryl group wherein at least one of the said substituents is electron-withdrawing such that the pKa of the conjugate acid of the leaving group formed from R.sub.3 and the --O, --S or --N(SO.sub.2R.sub.5) of the L.sub.2 group is .ltoreq. about 9.5; and X.sup.- is an anion formed as the result of the synthesis and processing of the molecule; wherein the compound may contain one or more additional R.sub.2 moieties on either or both outer rings, provided that only one of said R.sub.2 moieties may comprise an R.sub.4-L.sub.1-group.

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First Claim