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ESR studies of poly(aniline-co-m-aminophenol) in the solid state and nonaqueous solution.

Shaolin Mu1, Chong Chen

  • 1Department of Chemistry, Yangzhou University, Yangzhou, Jiangsu Province, China. slmu@yzu.edu.cn

The Journal of Physical Chemistry. B
|June 6, 2007
PubMed
Summary

This study synthesized poly(aniline-co-m-aminophenol) copolymers and used Electron Spin Resonance (ESR) to analyze their properties. Results show spin densities correlate with conductivity, revealing insights into copolymer electronic behavior.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Spectroscopy

Background:

  • Poly(aniline-co-m-aminophenol) copolymers are synthesized.
  • Electron Spin Resonance (ESR) is a key technique for studying paramagnetic species in materials.

Purpose of the Study:

  • To synthesize poly(aniline-co-m-aminophenol) copolymers with varying monomer ratios.
  • To investigate the electronic properties and radical species within these copolymers using ESR spectroscopy.

Main Methods:

  • Chemical synthesis of copolymers with different m-aminophenol to aniline concentration ratios.
  • Electron Spin Resonance (ESR) measurements in solid state and nonaqueous solutions.
  • Calculation of unpaired spin (polaron) densities and analysis of ESR parameters (line width, g-value).

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Main Results:

  • Calculated unpaired spin densities ranged from 1.14 x 10^19 spins/g (copolymer-A, 7.02 x 10^-6 S cm^-1) to 2.03 x 10^20 spins/g (copolymer-C, 2.34 S cm^-1).
  • Solid-state ESR showed peak-to-peak line width (ΔHpp) decreased with lower m-aminophenol ratios, while g-value remained stable.
  • Temperature-dependent studies (136-356 K) indicated a conversion from Curie to Pauli spins.
  • Solution ESR revealed two types of free radicals, with unpaired spins originating from nitrogen nuclei.

Conclusions:

  • ESR spectroscopy effectively characterizes the electronic properties and radical nature of poly(aniline-co-m-aminophenol) copolymers.
  • Monomer ratio significantly influences spin density and conductivity.
  • The presence of nitrogen nuclei is crucial for unpaired spins in these copolymers.