Please use this identifier to cite or link to this item: http://nopr.niscair.res.in/handle/123456789/15583
Title: Solvent effect on the photophysical behavior of some bischromophoric dyes
Authors: Baliarsingh, Sasmita
Patel, Sabita
Mishra, Bijay K
Keywords: Photophysical behavior;Solvent effect;Solvatochromism;Polarity switch;Absorption spectra;Emission spectra;Solvent parameters;Stokes shift;Hemicyanine dyes;Bischromophoric dyes;Successive exclusion of variable
Issue Date: 4-Jan-2013
Abstract: Absorption and emission spectra of some bischromophoric dyes, having 4-(p-N,N-dimethylaminostyryl) pyridinium units flanked by spacers with 2, 3, 4 and 6 methylene units, in different organic solvents have been subjected to multiple regression analysis with twelve different solvent parameters. Optimization of multiparametric regression models has been achieved by successive exclusion of variable technique. The validity of the regression models has been established from the linearity of the calculated and observed transition energy relating to absorption spectra and Stokes shift. Variation in the trends in change of photophysical behavior of the dyes results in classification of the solvents into two distinct classes, viz., hydroxylic and dipolar aprotic solvents. A higher dipole moment of the excited state than of the ground state of all these dyes has been deduced from the Stokes shift. The study on quantitative Stokes shift-solvent parameter relationship reveals a significant change in the behavior of dyes with two methylene units as compared to the other dyes. To this effect different types of hydrogen bonding has been proposed.
Page(s): 9-18
URI: http://hdl.handle.net/123456789/15583
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.52A(01) [January 2013]

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