Patent ID: 8119422

Claim:
A hydrolytically stable, fast light emitting chemiluminescent acridinium ester comprising the structure of Formula I: wherein Q is selected independently at each occurrence from a bond, —O—, —S—, or —N(R*)—; wherein R* is selected independently at each occurrence from hydrogen, substituted or unsubstituted, branched or straight chain alkyl, alkenyl, alkynyl, aryl, alkyl-aryl, or aryl-alkyl, and combinations thereof, optionally containing from one to 20 heteroatoms selected from the group consisting of oxygen, nitrogen, phosphorous, sulfur, halogen, and combinations thereof; with the proviso that at least one Q must be —O—, —S—, or —N(R*)—; wherein R 1 is an alkyl, alkenyl, alkynyl, aryl-alkyl or alkyl-aryl group containing up to 20 heteroatoms.