Paul Conrow

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.

Library of Congress Subject Headings

Polymers--Quenching; Fluorescence; Micelles; Latex; Complex compounds--Synthesis; Carbazole--Quenching

Publication Date

8-1-2001

Document Type

Thesis

Department, Program, or Center

School of Chemistry and Materials Science (COS)

Advisor

Langner, Andreas

Comments

Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: QD381 .C667 2001

Campus

RIT – Main Campus

Download

Share

COinS