Time-resolved spectroscopy of 2-naphthol-triethylamine charge-transfer complexes in polar and non-polar solvents

Bisht, P. B. ; Joshi, G. C. ; Tripathi, H. B. ; Pant , D. D. (1987) Time-resolved spectroscopy of 2-naphthol-triethylamine charge-transfer complexes in polar and non-polar solvents Chemical Physics Letters, 142 (3-4). pp. 291-297. ISSN 0009-2614

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/000926...

Related URL: http://dx.doi.org/10.1016/0009-2614(87)80940-5

Abstract

Hydrogen-bonded complexes of 2-naphthol-triethylamine have been studied in different polar and non-polar solvents. The ground-state equilibrium constants and the excited-state Stern-Volmer quenching rates have been calculated and both have been found to be greater in non-polar solvents. Decay-associated spectra and excitation spectra have shown that in non-polar solvents the exciplex is totally non-emitting while the ground-state hydrogen-bonded complex gives rise to a solvent-stabilised red-shifted ion-pair spectrum. In polar solvents, the usual excited-state proton transfer reaction takes place in which a risetime in the decay curve of solvent-separated ion pairs and a large red-shift in the spectrum are observed.

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