CONVENIENT AND SIMPLE METHODS FOR THE OBSERVATION OF PHOSPHORESCENCE IN FLUID SOLUTIONS. INTERNAL AND EXTERNAL HEAVY ATOM AND MICELLAR EFFECTS |
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Authors: | Nicholas J. Turro Kou-Chang Lru Ming-Fea Chow Plato Lee |
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Affiliation: | Department of Chemistry, Columbia University, New York, NY 10027, USA. |
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Abstract: | Abstract— Phosphorescence of organic molecules in fluid solutions may be conveniently and readily observed under certain conditions. If k p (radiative phosphorescence rate constant) is 10s-1, then (in the absence of photoreaction) phosphorescence is observable upon N2 purging. For example, nitrogen purged, acetonitrile solutions of bromo and dibromonaphthalene display readily observable phosphorescence as a result of internal heavy atom enhancement of πS, and k p. External heavy atom enhancement of k, (CH2BrCH2Br solvent) of aromatic hydrocarbons even allows observation of phosphorescence from these compounds in N2 purged fluid solutions. Although bromonaphthalenes are not significantly phosphorescent in N2 purged aqueous solution, phosphorescence is readily observed in N2 purged detergent (HDTBr, HDTCl, and SDS) solutions above the critical micelle concentration. The general factors which determine whether phosphorescence is "readily" obervable in fluid solution are briefly discussed and the results are interpreted in light of these factors. |
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