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Open AccessArticle

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

1
Ioffe Institute, 26 Politekhnicheskaya, St Petersburg 194021, Russian Federation
2
Institute of Earth Sciences, Saint-Petersburg State University, 7/9 Universitetskaya Nab., St Petersburg 199034, Russian Federation
3
Institute of Problems of Mechanical Engineering, 61 Bolshoy pr. V.O., St Petersburg 199004, Russian Federation
4
Institute of macromolecular compounds, 31 Bolshoy pr. V.O., St Petersburg 199004, Russian Federation
*
Author to whom correspondence should be addressed.
Crystals 2019, 9(11), 573; https://doi.org/10.3390/cryst9110573
Received: 27 September 2019 / Revised: 28 October 2019 / Accepted: 29 October 2019 / Published: 31 October 2019
(This article belongs to the Special Issue Novel Hydrogen-bonded Materials with Significant Physical Properties)
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. View Full-Text
Keywords: semiorganic crystals; hydrogen bonds; crystal structure; XRD; crystal growth; Raman spectroscopy; dielectric properties; proton conductivity semiorganic crystals; hydrogen bonds; crystal structure; XRD; crystal growth; Raman spectroscopy; dielectric properties; proton conductivity
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Balashova, E.V.; Svinarev, F.B.; Zolotarev, A.A.; Levin, A.A.; Brunkov, P.N.; Davydov, V.Y.; Smirnov, A.N.; Redkov, A.V.; Pankova, G.A.; Krichevtsov, B.B. Crystal Structure, Raman Spectroscopy and Dielectric Properties of New Semiorganic Crystals Based on 2-Methylbenzimidazole. Crystals 2019, 9, 573.

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