Heavy-atom quenching of 9-ethylcarbazole in heterogeneous matrices: Micelles and latexes

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Title: Heavy-atom quenching of 9-ethylcarbazole in heterogeneous matrices: Micelles and latexes
Author: Conrow, Paul
Abstract: The fluorescence quenching of 9-ethylcarbazole was studied in solution and heterogeneous dispersions. A heavy-atom quencher, 4-iodotoluene, was used to quench the fluorescence of 9-ethylcarbazole. Polymer analogs of 9-ethylcarbazole and 4-iodotoluene were incorporated into separate latex solutions, and quenching experiments were carried out with non-polymer and latex-bound analytes. Quenching in micellar solutions and latex dispersions was 20-1000 times more efficient than in homogeneous solutions. The diffusion of analytes into the dispersed phase of heterogeneous matrices created high local concentrations of the fluorescing species and quencher, while the global concentrations remained relatively low. The fluorescence quenching in latex solutions of poly[(methyl methacrylate)-co-vinylcarbazole] was exceptionally efficient. At SDS concentrations of 0.008 M, a Stern-Volmer slope of 80,000 was obtained. A quencher concentration of 1 x 10"6M was sufficient to cause significant quenching in latex solutions that had a carbazole concentration of 5.5 x 10"5 M.
Record URI: http://hdl.handle.net/1850/15159
Date: 2001-08

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