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Solvatochromism of Nile Red in Nonpolar Solvents

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Abstract:

The absorbance and fluorescence spectra of Nile Red (NR) were examined in a series of nonpolar solvents comprising linear alkanes and a range of poly alpha olefins (PAO). These solvents span a 1000-fold range in viscosity and possess very similar dielectric constants and refractive index properties. A high-energy double peak with vibronic structure is observed in both fluorescence and absorbance spectra, possibly indicating that a locally excited (LE) state is accessed in these solvents. In addition, a red shift in peak position is observed with increasing refractive index; however, it is unaccompanied by any changes in Stokes shift. This shift is attributed to changes in the high-frequency polarizability of the solvent, which is a function of the refractive index. Finally, an increase in quantum yield with viscosity is also observed.

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702041389328

Affiliations: Corporate Strategic Research, ExxonMobil Research and Engineering, Annandale, New Jersey 08801

Publication date: July 1, 2004

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