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

✍ Scribed by P.B. Bisht; G.C. Joshi; H.B. Tripathi; D.D. Pant

• Publisher: Elsevier Science
• Year: 1987
• Tongue: English
• Weight: 439 KB
• Volume: 142
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(87)80940-5

✦ Synopsis

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 Stem-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.