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Acta Chimica Sinica >

2012 , Vol. 70 >Issue 11: 1271 - 1277

DOI: https://doi.org/10.6023/A1110284

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Comparative Study on Electrocopolymerization of m-Toluidine and o-Toluidine

  • Zhang Guirong ,
  • Zhao Xueru ,
  • Xu Xiaoming ,
  • He Li ,
  • Wu Liang ,
  • Lu Jiaxing
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  • Department of Chemistry, East China Normal University, Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Shanghai 200062

Received date: 2011-10-28

  Revised date: 2012-04-05

  Online published: 2012-04-19

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 20973065, 21173085) and Key Project for Subject Construction of Shanghai (No. B409).

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Abstract

The in situ UV-Vis spectra of electropolymerization of m-toluidine and o-toluidine on indium tin oxide (ITO) conducting glass electrode by potentiostatic method in sulfuric acid of 0.5 mol稬-1 show that the electropolymerization of o-toluidine is faster than that of m-toluidine under the same condition. The current transient curves of electrolyzing m-toluidine and o-toluidine at potential 0.9 V (vs saturated Ag/AgCl) indicate that both poly(m-toluidine) and poly(o-toluidine) are deposited on ITO electrode in three-dimensional progressive nucleation (3DPN) at the beginning of electropolymerization; then the electropolymerization of o-toluidine keeps in branch chain reaction and the electopolymerization of m-toluidine becomes slow greatly. Due to the difference of the electropolymerization of them, the scan electron microscope morphology of poly(o-toluidine) is granulous and porous and that of poly(m-toluidine) is compact and slightly smooth. DFT geometry optimization using B3LYP/6-31G** basis set for the tetramer of o-toluidine and m-toluidine demonstrates that the emeraldine base (EB) for tetramer of m-toluidine has curly structure but EB for tetramer of o-toluidine not, which implies that the conformation difference between poly(m-toluidine) and poly(o-toluidine) might be main cause of the difference of their electropolymerization.

Key words： o-toluidine; m-toluidine; electrocopolymerization; UV-Vis spectrometry

Cite this article

Zhang Guirong , Zhao Xueru , Xu Xiaoming , He Li , Wu Liang , Lu Jiaxing . Comparative Study on Electrocopolymerization of m-Toluidine and o-Toluidine[J]. Acta Chimica Sinica, 2012 , 70(11) : 1271 -1277 . DOI: 10.6023/A1110284

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