Electrochemical properties and Fourier transform-infrared spectroscopic investigations of the redox behaviour of poly(indole-5-carboxylic acid) in LiClO4-acetonitrile solutions.
Electropolymerisation of indole-5-carboxylic-acid leads to the formation of electroactive polymer films. Potentiostatic deposition of the related polymer, poly(indole-5-carboxylic-acid), was carried out at a constant potential at 1.35 V versus SCE. The cyclic voltammogram of the resulting polymer in LiClO4 (0.15 mol dm(-3))/acetonitrile solution is characterized by two poorly resolved anodic and cathodic set peaks. FTIR spectroscopy was used to characterize both reduced and oxidized forms of poly(indole-5-carboxylic-acid). Assignments of the vibrational modes were proposed by comparison of the vibrational spectra of polyindole and polycyanoindole. The polymerization sites correspond to the 2 and 3 carbon positions of the pyrrole cycle. In the oxidized form of the polymer, the NH group is deprotonated while the quinoid form is present between the pyrrole rings.
Billaud
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D
LCSM, UMR 7555, Université Henri Poincaré Nancy I, BP 239, 54506 Vandoeuvre les Nancy Cédex, France. denis.billaud@lcsm.uhp-nancy.fr
Humbert
B
B
Thevenot
L
L
Thomas
P
P
Talbi
H
H
D000097:Acetonitriles / Q000032:analysis* / Q000737:chemistry; D004563:Electrochemistry / Q000379:methods*; D018020:Lithium Compounds / Q000032:analysis* / Q000737:chemistry; D008956:Models, Chemical; D010472:Perchlorates / Q000032:analysis* / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*
D000097:Acetonitriles; D018020:Lithium Compounds; D010472:Perchlorates; C054684:lithium perchlorate; C032159:acetonitrile