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The fluorescence quenching of meso-tetrakis ( p -sulfonatophenyl) porphyrin (TSPP) by certain anthraquinone and azo dyes has been investigated using steady state fluorescencetechnique. The dyes used were Uniblue-A, Acid blue 129, Alizarin, Alizarin red S, Erichrome Black T, Tartrazine, Methyl orange, Methyl red, Acid orange 63 and Congo red. The quenching was found to obey Stern-Volmer equation and the corresponding Stern-Volmer plots were linear. The quenching rate constant ( k   q  ) is in the order of 0.19–6.08×10 12  M −  1 s −  1 . This study reveals effective quenching of TSPP by organic dyes.

Fluorescence Quenching of Meso -Tetrakis( p -Sulfonatophenyl)Porphyrin (TSPP) by certain Organic Dyes