Crystal Structure, Raman Spectroscopy and Dielectric Properties of New Semiorganic Crystals Based on 2-Methylbenzimidazole

New single crystals, based on 2-methylbenzimidazole (MBI), of MBI-phosphite (C16H24N4O7P2), MBI-phosphate-1 (C16H24N4O9P2), and MBI-phosphate-2 (C8H16N2O9P2) were obtained by slow evaporation method from a mixture of alcohol solution of MBI crystals and water solution of phosphorous or phosphoric ac...

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Bibliographic Details
Published in:Crystals (Basel) 2019-11, Vol.9 (11), p.573
Main Authors: Balashova, E. V., Svinarev, F. B., Zolotarev, A. A., Levin, A. A., Brunkov, P. N., Davydov, V. Yu, Smirnov, A. N., Redkov, A. V., Pankova, G. A., Krichevtsov, B. B.
Format: Article
Language:English
Subjects:
Alcohol
Approximation
Chemical composition
crystal growth
Crystal structure
Dielectric properties
Dielectric strength
Ferroelectrics
Glass substrates
Hydrogen bonds
Low temperature
Permittivity
Phosphoric acid
proton conductivity
Radiation
Raman spectroscopy
semiorganic crystals
Single crystals
Spectrum analysis
Water chemistry
X-ray diffraction
xrd
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Summary:New single crystals, based on 2-methylbenzimidazole (MBI), of MBI-phosphite (C16H24N4O7P2), MBI-phosphate-1 (C16H24N4O9P2), and MBI-phosphate-2 (C8H16N2O9P2) were obtained by slow evaporation method from a mixture of alcohol solution of MBI crystals and water solution of phosphorous or phosphoric acids. Crystal structures and chemical compositions were determined by single crystal X-ray diffraction (XRD) analysis and confirmed by XRD of powders and elemental analysis. Raman spectroscopy of new crystals evidences the presence in crystals of MBI-, H3PO3-, or H3PO4- and water molecules. Dielectric properties of crystals reveal strong increase and low frequency dispersion of dielectric constant and losses at heating, indicating the appearance of proton conductivity. At low temperatures in MBI-phosphate-2, an increase of dielectric constant analogous to quantum paraelectric state is observed.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst9110573