
%0 Journal Article
%A Majidi, Mir Reza 
%A Kane-Maguire, Leon A. P. 
%A Wallace, Gordon G. 
%T Electrochemical Synthesis of Optically Active Polyanilines
%J Australian Journal of Chemistry
%D 1998/03/04
%V 51
%N 1
%P 23-30
%K 
%R https://doi.org/10.1071/C97108
%U https://www.publish.csiro.au/paper/C97108 
%X The synthesis of optically active polyaniline salt films of the type PAn.HCSA (HCSA = camphor-10-sulfonic acid) has been achieved via the enantioselective electropolymerization of aniline on indium-tin-oxide (ITO)-coated glass electrodes in the presence of (+)- or (&#8211;)-HCSA. Similar results were obtained under potentiostatic, galvanostatic and potentiodynamic conditions. The chiroptical and electrical properties of these novel materials have been characterized by u.v.&#8211;visible and circular dichroism (c.d.) spectroscopy, electrochemical quartz crystal microbalance techniques and resistometry. The intensity of the c.d. spectra of potentiostatically grown PAn.(+)-HCSA films was found to increase with increasing applied potential over the range 0&#183;8&#8211;1&#183;1 V (v. Ag/AgCl) and with increasing charge consumed. C.d. spectroscopic studies also showed that the polyaniline chains retained their initial configuration when the (+)-HCSA dopant acid in PAn.(+)-HCSA films was replaced by HCl via potential cycling in 1 mol dm-3 HCl. Similarly, chemical de-doping of PAn.(+)-HCSA with 0&#183;5 mol dm-3 NH4OH produced optically active emeraldine base, which upon re-doping with HCl gave optically active PAn.HCl with a c.d. spectrum very similar to that of the original PAn.(+)-HCSA. These results suggest that chiral holes may be formed in the polymer matrix during both redox and chemical de-doping/re-doping cycles with PAn.(+)-HCSA salt films. 
