Date of Award

6-2001

Document Type

Union College Only

Degree Name

Bachelor of Science

Department

Chemistry

Language

English

Abstract

We present the results of a fundamental investigation of how the presence of surfactant affects the self-interaction of cationic laser dyes in aqueous solution. Oxazine 1 and oxazine 170 are known to form non-fluorescent H-aggregates (n-stacked dimers). The interactions of each of these laser dyes with sodium dodecyl sulfate (SDS), a micelle forming, anionic surfactant, have been examined using UV-visible absorption and fluorescence spectroscopy, fluorescence anisotropy, and Rayleigh scattering. The colors of oxazine 170 solutions are visually distinguishable into three stages: solutions with no SDS, solutions with SDS below the erne (8mM), and solutions with SDS concentrations above the erne. This shows that there are interactions between the dye and the surfactant. The results of the UV -visible absorption and fluorescence spectroscopy, fluorescence anisotropy, and Rayleigh scattering show differences above and below the erne, further indicating that there are different interactions taking place in these two environments.

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