Vol. 12 No. 1 (2013): Mapana Journal of Sciences
Research Articles

Solvent Effect on the Fluorescence Properties of Two Biologically Active Thiophene Carboxamido Molecules

  • D Nagaraja,
  • H S Geethanjali,
  • N R Patil,
  • F M Sanningannavar,
  • R A Kusanur,
  • R M Melavanki
D Nagaraja
Department of Physics, Bangalore Institute of Technology, Bangalore-560004, Karnataka, India
H S Geethanjali
Department of Physics, Bangalore Institute of Technology, Bangalore-560004, Karnataka, India
N R Patil
Department of Physics, B V B College of Engineering and Technology, Hubli-580031, Karnataka, India
F M Sanningannavar
Department of Physics, Karnatak Science College Dharwad-580003, Karnataka, India
R A Kusanur
Department of Chemistry, R. V. College of Engineering, Bangalore-560059, Karnataka, India
R M Melavanki
Department of Physics, M S Ramaiah Institute of Technology Bangalore-560054, Karnataka, India
DOI: https://doi.org/10.12723/mjs.24.6

Published 2013-02-01

Keywords

  • Solvatochromic shift method,
  • Ground state dipole moments,
  • Excited state dipole moments,
  • Thiophene carboxamido.

Abstract

The absorption and fluorescence spectra of two thiophene carboxamido molecules namely 2–( - trimethoxy phenyl) imino–3–N–ethylcarboxamido–4, 5, tetramethylene thiophene (X) and 2-( -N, N-dimethylaminophenyl) imino-3-(N- methylphenyl carboxamido)-4, 5, tetramethylene thiophene (Y) have been recorded at room temperature. The ground (mg) and excited (me) state dipole moments are estimated from Lippert, Bakhshiev, Kawski-Chamma-Viallet equations by using the variation of Stokes shift with microscopic solvent dielectric constant (e) and refractive index (n). The excited dipole moments were also estimated by using the variation of Stokes shift with microscopic empirical solvent polarity parameter and the values are compared. It was estimated that dipole moments of the excited state were higher than those of the ground state of both the molecules. Further, the change in dipole moment (Dm) were calculated both from solvatochromic shift method and on the basis of microscopic empirical solvent polarity parameter .

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