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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.17 [2010] >
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
Polyanilines
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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