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Preparation and chiro‐optical characterization of polyaniline doped with (+) or (−)‐2‐pyrrolidone‐5‐carboxylic acid (PCA)
Author(s) -
Dubey Rama,
Dutta Dhiraj,
Shami Trilok Chand,
Bhasker Rao Kandepudi Udaya
Publication year - 2011
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.20919
Subject(s) - chemistry , polyaniline , chirality (physics) , optically active , carboxylic acid , circular dichroism , enantiomer , enantioselective synthesis , polymer , solvent , doping , dimethylformamide , polymer chemistry , organic chemistry , crystallography , polymerization , catalysis , chiral symmetry , physics , optoelectronics , quantum mechanics , nambu–jona lasinio model , quark
Optically active polyaniline (PANI) salts were readily generated in solution via the enantioselective acid doping of neutral emeraldine base (EB) form of PANI with either (+) or (−)‐2‐pyrrolidone‐5‐carboxylic acid (PCA) in dimethylsulfoxide (DMSO) and dimethylformamide (DMF) solvents. Strong mirror imaged circular dichroism (CD) spectra were obtained for the deep green polymer solutions obtained with (+) or (−) PCA, suggesting that the acid doping is enantioselective, with one helical screw of the polymer chain being preferentially produced depending on the nature of enantiomer. It was observed that molar concentration of PCA as well as nature of solvent plays a very important role in the generation of optically active PANI. The generated optically active PANI did not show any loss of optical activity up to 200 h. Chirality, 2011. © 2010 Wiley‐Liss, Inc.