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IJSTR >> Volume 3- Issue 5, May 2014 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Study On Solvent Effect And Estimation Of Dipole Moments Of An Organic Fluorophore

[Full Text]



Thippe Rudrappa J



Keywords: Ketocyanine dye, Solvent effect, Dipole moment, Kamlet’s multiple linear regression, Stoke’s shift



Abstract: The effect of solvents on spectroscopic properties of an organic fluorophore 2,5-di[(E)-1-(4-diphenylaminophenyl) methylidine]-1-cyclopentanone (2,5-DPHAPMC) belonging to a ketocyanine dye family is analyzed using Lippert-Mataga bulk polarity function, Reichardt’s microscopic solvent polarity parameter and Kamlet’s multiple linear regression approach. The spectroscopic properties better follows Reichardt’s microscopic solvent polarity parameter than conventional Lippert-Mataga bulk polarity function. The double linear correlation of Stokes shift with Reichardt’s microscopic solvent polarity parameter for non-alcohol and alcohol solvents is observed. This indicates that both general solute – solvent interactions and specific interactions are contributing to the resultant spectral changes. Kamlet’s multiple linear regression approach indicates that polarizability/dipolarity solvent influences are dominating more compared to solvents hydrogen-bond donor and hydrogen-bond acceptor influences. The data on effect of solvents is used to estimate excited state dipole moment using the theoretically determined ground state dipole moment. The excited state dipole moment determined by different methods is compared and analysed. The excited state dipole moment of dye is found to be greater than its corresponding ground state counterpart and, ground and excited state dipole moments are almost perpendicular to each other.



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