Solvent effect on nonradiative process of pyronin B in protic and aprotic solvent systems

ACEMIOGLU B., ARIK M., Onganer Y.

JOURNAL OF LUMINESCENCE, cilt.97, ss.153-160, 2002 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 97
  • Basım Tarihi: 2002
  • Doi Numarası: 10.1016/s0022-2313(02)00218-1
  • Dergi Adı: JOURNAL OF LUMINESCENCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.153-160
  • Anahtar Kelimeler: fluorescence, pyronin B, internal conversion, nonradiative rate constant, solute-solvent interactions, INTRAMOLECULAR CHARGE-TRANSFER, RHODAMINE-B, QUANTUM YIELDS, EXCITED-STATE, XANTHENE DYES, INTERNAL-CONVERSION, MOLECULAR-STRUCTURE, ENERGY-GAP, FLUORESCENCE, PHOTOPHYSICS
  • Atatürk Üniversitesi Adresli: Evet

Özet

Absorption and emission spectra of pyronin B were taken in acetonitrile and acetonitrile-benzene solvent mixtures. Fluorescence lifetime (tau(f)) and quantum yield (Phi(f)) were determined as a function of temperature and nonradiative rate constant (k(nr)) was calculated from tau(f) and Phi(f). Activation energies of nonradiative process were obtained from Arrhenius plots of k(nr). Solvent effects on k(nr) were discussed in terms of proposed models. The results were compared to those previously obtained for pyronin B in n-alcohols and alcohol-water mixtures. Solvent polarity and specific solute-solvent interactions were the main parameters controlling the internal conversion process for pyronin B in protic and aprotic solvent systems. (C) 2002 Elsevier Science B.V. All rights reserved.