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

Acemioglu B., ARK M., EFEOĞLU H., ONGANER Y.

Journal of Molecular Structure: THEOCHEM, vol.548, no.1-3, pp.165-171, 2001 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 548 Issue: 1-3
  • Publication Date: 2001
  • Doi Number: 10.1016/s0166-1280(01)00513-9
  • Journal Name: Journal of Molecular Structure: THEOCHEM
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.165-171
  • Keywords: Dipole moment, Fluorescein, Solute-solvent interactions, Stokes' shift
  • Bilecik Şeyh Edebali University Affiliated: No

Abstract

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. © 2001 Elsevier Science B.V. All rights reserved.