
TY  - JOUR
A1  - Majidi, Mir Reza 
A1  - Kane-Maguire, Leon A. P. 
A1  - Wallace, Gordon G. 
T1  - Electrochemical Synthesis of Optically Active Polyanilines
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1998
VL  - 51
IS  - 1
SP  - 23
EP  - 30
KW  - 
UR  - https://doi.org/10.1071/C97108 
N2  - 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. 
ER  -

