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IJEMS Vol.17(3) [June 2010] >

Title: Study on solvatochromic behaviour of polyaniline and alkyl substituted polyanilines
Authors: Sharma, Shalini
Kumar, D
Keywords: Conducting polymer
Solvatochromic shift
Band gap
Issue Date: Jun-2010
Publisher: CSIR
Abstract: The polyaniline and alkyl substituted polyanilines have been synthesized by chemical polymerization method and then characterized by using UV-visible spectrophotometer in different solvents such as propionic acid, acetic acid, formic acid and N-methyl-2-pyrrolidone. UV-visible data reveal that the nature (blue or red shift) and amount (i.e., strong or weak) of the shifts of polyanilines depends on the solvents used and the presence of alkyl substituents. The solvatochromic behaviour of these polymers has been studied in different solvents in order to explain all the shifts qualitatively. A comparative energy diagram is also presented to show the effect of the solvents on conducting polymers giving mainly two transitions, i.e., p-p* and n-p*. The band gap values have been calculated for all these conducting polymers by Tauc’s method and these band gap values are found in the range 2.38-3.16 eV. The significance of present study evolves a trend in solvatochromic shifts of polyaniline and alkyl substituted polyanilines in different solvents.
Page(s): 231-237
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.17(3) [June 2010]

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