Electrochemical polymerization and spectroscopic investigation of 2-methylindole

Udum Y. , Dudukcu M., Koleli F.

REACTIVE & FUNCTIONAL POLYMERS, vol.68, no.4, pp.861-867, 2008 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 68 Issue: 4
  • Publication Date: 2008
  • Doi Number: 10.1016/j.reactfunctpolym.2007.12.006
  • Page Numbers: pp.861-867
  • Keywords: indole, conducting polymer, electropolymerization, ESR, EIS, INDOLE DIMERS, POLYINDOLE, OXIDATION, FILMS, POLY(5-CYANOINDOLE), ELECTROSYNTHESES, DERIVATIVES


Synthesis of poly (2-methylindole) (P2MI) was achieved by direct anodic oxidation of 2-methylindole in LiClO4/acetonitrile solution. The P2MI film was generated potentiodynamically between 0.00 V and +1.80 V (vs. Ag/AgCl, saturated KCl). The oxidation of 2-methylindole in this medium was initiated at +0.65 V. The electroactive P2MI film exhibited a good air stability and electrochromic properties. The P2MI film presented an electrical conductivity close to 10(-3) 10(-4) S cm(-1). Electrochemical polymerization mechanism of 2-methylindole was proposed as 3-6 linkage sites of the monomer. P2MI film was characterized by cyclic voltammetry, dry conductivity measurements, scanning electron microscopy (SEM) pictures, electron spin resonance (ESR), Fourier transfer infrared (FT-IR) and electrochemical impedance spectroscopies (EIS). (C) 2007 Elsevier Ltd. All rights reserved.