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Solvatochromic and preferential solvation studies on schiff base 1,4-bis(((2-methylthio)phenylimino)methyl) benzene
G Suganthi1, S Sivakolunthu, V Ramakrishnan
1Department of Laser Studies, School of Physics, Madurai Kamaraj University, Madurai, 625 021, India. sugiphys@yahoo.co.in
Abstract:
The solvatochromic behavior of the 1,4-bis(((2-methylthio) phenylimino)methyl) benzene [BMTPMB] in single solvents and binary mixtures were investigated. Fluorescence spectra show the dual emission due to twisted intramolecular charge transfer (TICT) state. The preferential solvation parameters: local mole fraction, X (2) (L) , solvation index δ(s2), exchange constant K(12) were calculated for the binary mixtures, ACN+MEOH, DMSO+CCl(4) and CCl(4)+1,2 DCE. The dipole moment ratios between ground and excited states were deduced using the solvatochromic shifts of absorption and fluorescence spectra as a function of dielectric constant (ε), refractive index (n) and it was found to be 1.25.
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