Abstract
The chiroptical properties of optically active polyaniline PANI(+)-HCSA emeraldine salt products in dimethylformamide (DMF) depend strongly on stereochemistry and steric crowding due to the presence of different moieties on the amino acids. Amino acids including L-arginine, L-proline, L-leucine, L-isoleucine, L-phenylalanine and L-lysine hydrochloride were used as precursors in emeraldine base/DMF solutions prior to acid doping with (S)-(+)-10-camphorsulfonic acid. Characterization of these materials was carried out using CD, UV-Vis and FTIR spectroscopic techniques. Our results indicate that the optical activity can be maintained for longer times in the solid and solution phases owing to the interactions and stabilization of polyaniline by hydrogen bond formation between the amino-acid molecules and the amine (NH) and imine (−N=) sites on the emeraldine base form, while preserving the stereo-selectivity of the polymer chain. This paper addresses the factors responsible for influencing the chiroptical properties in helical conducting polyaniline and the chiral discrimination of different amino acids.
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Acknowledgements
We are thankful to Professor PB Sharma, Vice-Chancellor, Delhi Technological University (formerly Delhi College of Engineering), Delhi for encouragement and support. We are also thankful to DST, New Delhi for a financial grant under the DST-JSPS collaborative research program. Financial support to one of the authors, Sudha, is also acknowledged.
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Sudha, Kumar, D. & Iwamoto, M. Investigation of the chiroptical behavior of optically active polyaniline synthesized from naturally occurring amino acids. Polym J 45, 160–165 (2013). https://doi.org/10.1038/pj.2012.127
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DOI: https://doi.org/10.1038/pj.2012.127
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