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A new method describing the in situ synthesis of azo dyes in the mesopores of acidic faujasites is presented, where the coupling component N,N-dimethylaniline is adsorbed by interaction with the acidic centers, and zinc double salts of diazo compounds are added in weak acidic solution. Ship-in-the-bottle synthesis is achieved for azo dyes where the largest dimension of one component, i.e., approximately...