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The influence of phase transformations on the frequencies of molecular vibrations in films of 2-methylbenzimidazole perchlorate C8H8N2-HClO4
Russian version
Krichevtsov B. B. 1, Pavlov S.I. 1, Redkov A.V. 2, Balashova E.V. 1
1Ioffe Institute, St. Petersburg, Russia
2Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences, St. Petersburg, Russia
Email: boris@mail.ioffe.ru, Pavlov_sergey@mail.ioffe.ru, red-alex@mail.ru, balashova@mail.ioffe.ru
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Films of 2-methylbenzimidazolium perchlorate C8H8N2-HClO4 (MBI·HClO4) were grown on sapphire Al2O3(0001) substrates. The frequencies of molecular vibrations of MBI·HClO4 were studied during phase transitions from the ionic crystal (IC) state to the intermediate phase and to the ionic liquid (IL) phase. Raman spectra were obtained in the range of 80-3300 cm-1, as well as infrared absorption and reflectance (FTIR) spectra in the range of 650-5000 cm-1. It was shown that in the IL phase, as in the IR phase, the MBI molecule remains protonated as the MBI-H+ cation, and perchloric acid is present as the ClO4- anion. Analysis of the FTIR spectra showed that the ionic liquid crystal state is realized in the intermediate phase. Keywords: ionic liquid, ionic liquid crystal, ionic crystal, Raman spectroscopy, infrared spectroscopy.
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