Abstract
p-Phenylenediamine was oxidized with p-benzoquinone in the aqueous solutions of methanesulfonic acid (MSA). The conductivity of the products increased with increasing concentration of MSA from 1.5 × 10−12 S cm−1 in 0.1 M MSA up to 3.4 × 10−4 S cm−1 in 5 M MSA. The low-molecular-weight products are basically composed of one p-benzoquinone and two p-phenylenediamine molecules. Their molecular structure is discussed on the basis of mass, Fourier-transform infrared, Raman, NMR and electron paramagnetic resonance (EPR) spectroscopies. The formation of 2,5-di(p-phenylenediamine)-p-benzoquinone protonated with methanesulfonic acid best complies with the information provided by spectroscopic techniques. Its conversion to hydroquinone tautomer explains the formation of unpaired spins observed by EPR and their potential contribution to the conduction.
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Acknowledgments
The authors thank the Czech Science Foundation (P205/12/0911) and the Czech–Austrian mobility project (7AMB14AT005) for financial support. LDI mass spectra has kindly been provided by Z. Walterová from IMC in Prague.
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Stejskal, J., Trchová, M., Morávková, Z. et al. Conducting materials prepared by the oxidation of p-phenylenediamine with p-benzoquinone. J Solid State Electrochem 19, 2653–2664 (2015). https://doi.org/10.1007/s10008-015-2838-3
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DOI: https://doi.org/10.1007/s10008-015-2838-3