Solvent effect on absorption and fluorescence spectra of three biologically active carboxamides (C1, C2 and C3). Estimation of ground and excited state dipole moment from solvatochromic method using solvent polarity parameters.
The absorption and fluorescence spectra of three Carboxamides namely (E)-2-(4-Chlorobenzylideneamino)-N-(2-chlorophenyl)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (C(1)), (E)-N-(3-Chlorophenyl)-2-(3, 4-dimethoxybenzylideneamino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (C(2)) and (E)-N-(3-Chlorophenyl)-2-(3,4,5-trimethoxybenzylideneamino)-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxamide (C(3)) have been recorded at room temperature in solvents of different polarities using dielectric constant (ε) and refractive index (n). Experimental ground (μ(g)) and excited (μ(e)) state dipole moments are estimated by means of solvatochromic shift method and also the excited dipole moments are estimated in combination with ground state dipole moments. It was estimated that dipole moments of the excited state were higher than those of the ground state of all three molecules. Further, the changes in dipole moment (Δμ) were calculated both from solvatochromic shift method and on the basis of microscopic empirical solvent polarity parameter (E(N)(T)) and the values are compared.
Department of Physics, B V B College of Engineering and Technology, Hubli 580031, Karnataka, India.
N R
NR
Patil
R M
RM
Melavanki
S B
SB
Kapatkar
N H
NH
Ayachit
J
J
Saravanan
D000042:Absorption; D000577:Amides / Q000737:chemistry*; D008956:Models, Chemical; D012997:Solvents / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013057:Spectrum Analysis; D055672:Static Electricity
D000577:Amides; D012997:Solvents
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Feb;69(2):419-26
17540614
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Jun;60(7):1677-83
15147713
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Jul;60(8-9):1805-10
15248953
Spectrochim Acta A Mol Biomol Spectrosc. 2006 Nov;65(3-4):673-7
16524762
Arch Pharm (Weinheim). 1985 Jan;318(1):49-59
2985024
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Jul;60(8-9):1985-9
15248976