Solvent effect on the ground and excited state dipole moments of fluorescein

ACEMIOGLU B., ARIK M., EFEOGLU H., Onganer Y.

JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM, cilt.548, ss.165-171, 2001 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 548
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1016/s0166-1280(01)00513-9
  • Dergi Adı: JOURNAL OF MOLECULAR STRUCTURE-THEOCHEM
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.165-171
  • Anahtar Kelimeler: fluorescein, Stokes' shift, dipole moment, solute-solvent interactions
  • Atatürk Üniversitesi Adresli: Evet

Özet

The ground-state and excited-state dipole moments of fluorescein were studied at room temperature in n-alcohols (methanol-n-hexanol) and acetonitrile and acetonitrile-benzene solvent mixtures. The excited-state dipole moments were estimated from Lippert's, Bakhshiev's and Chamma-Viallet's equations by using the variation of the Stokes' shift with the solvent dielectric constant and refractive index. Experimental ground-state dipole moments for fluorescein in n-alcohols, acetonitrile and acetonitrile-benzene solvent mixtures were estimated by the Guggenheim- Smith method (GSM). It was determined that dipole moments of the excited-state were higher than those of the ground-state in n-alcohols while they were lower than those of the ground-state in acetonitrile and acetonitrile-benzene solvent mixtures. The solute-solvent interactions on the ground-state and the excited-state dipole moments of fluorescein are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.