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Balashova E, Levin AA, Pavlov S, Starukhin A, Fokin A, Kurdyukov D, Eurov D, Krichevtsov B. Synthesis and Study of Organic Nanostructures Fabricated by Inclusion of 2-Methylbenzimidazole Molecules in Nanotubes of Chrysotile Asbestos, Mesoporous Silica, and Nanopores of Borate Glasses. Int J Mol Sci 2023; 24:13740. [PMID: 37762043 PMCID: PMC10531229 DOI: 10.3390/ijms241813740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 08/27/2023] [Accepted: 08/28/2023] [Indexed: 09/29/2023] Open
Abstract
New organic nanostructures were synthesized by introducing 2-methylbenzimidazole (MBI) molecules from a melt, gas phase, or alcoholic solution into nanosized voids of borate porous glasses (PG), nanotubes of chrysotile asbestos (ChA), and mesoporous silica (MS). The incorporation of MBI into borate glasses with different pore sizes is accompanied by the appearance of several phases formed by nanocrystallites which have a MBI crystal structure, but somewhat differ in lattice parameters. The size of some crystallites significantly exceeds the size of nanopores, which indicates the presence of long-scale correlations of the crystal structure. The size of MBI nanocrystallites in ChA was close to the diameter of nanotubes (D ~10 nm), which shows the absence of crystal structure correlations. The XRD pattern of mesoporous silica filled by MBI does not exhibit reflections caused by MBI and a presence of MBI was confirmed only by the analysis of correlation function. The incorporation of MBI molecules into matrices is observed through optical IR absorption spectroscopy (FTIR) and photoluminescence. Introducing MBI in ChA and MS is followed by the appearance of bright green photoluminescence, the spectral structure of which is analogous to MBI crystals but slightly shifted in the blue region, probably due to a quantum-size effect. The influence of MBI inclusion in PG and ChA on the permittivity, dielectric losses, conductivity, and parameters of their hopping conductivity is analyzed.
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Affiliation(s)
- Elena Balashova
- Ioffe Institute, Russian Academy of Sciences, Politechnicheskaya 26, 194021 Saint Petersburg, Russia; (A.A.L.); (S.P.); (A.S.); (A.F.); (D.K.); (D.E.); (B.K.)
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Balashova E, Zolotarev A, Levin AA, Davydov V, Pavlov S, Smirnov A, Starukhin A, Krichevtsov B, Zhang H, Li F, Luo H, Ke H. Crystal Structure, Raman, FTIR, UV-Vis Absorption, Photoluminescence Spectroscopy, TG-DSC and Dielectric Properties of New Semiorganic Crystals of 2-Methylbenzimidazolium Perchlorate. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1994. [PMID: 36903111 PMCID: PMC10004103 DOI: 10.3390/ma16051994] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Revised: 02/22/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Single crystals of 2-methylbenzimidazolium perchlorate were prepared for the first time with a slow evaporation method from an aqueous solution of a mixture of 2-methylbenzimidazole (MBI) crystals and perchloric acid HClO4. The crystal structure was determined by single crystal X-ray diffraction (XRD) and confirmed by XRD of powder. Angle-resolved polarized Raman and Fourier-transform infrared (FTIR) absorption spectra of crystals consist of lines caused by molecular vibrations in MBI molecule and ClO4- tetrahedron in the region ν = 200-3500 cm-1 and lattice vibrations in the region of 0-200 cm-1. Both XRD and Raman spectroscopy show a protonation of MBI molecule in the crystal. An analysis of ultraviolet-visible (UV-Vis) absorption spectra gives an estimation of an optical gap Eg~3.9 eV in the crystals studied. Photoluminescence spectra of MBI-perchlorate crystals consist of a number of overlapping bands with the main maximum at Ephoton ≅ 2.0 eV. Thermogravimetry-differential scanning calorimetry (TG-DSC) revealed the presence of two first-order phase transitions with different temperature hysteresis at temperatures above room temperature. The higher temperature transition corresponds to the melting temperature. Both phase transitions are accompanied by a strong increase in the permittivity and conductivity, especially during melting, which is similar to the effect of an ionic liquid.
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Affiliation(s)
- Elena Balashova
- Ioffe Institute, Politechnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Andrey Zolotarev
- Institute of Earth Sciences, Saint Petersburg State University, Universitetskaya Nab. 7/9, 199034 Saint Petersburg, Russia
| | | | - Valery Davydov
- Ioffe Institute, Politechnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Sergey Pavlov
- Ioffe Institute, Politechnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Alexander Smirnov
- Ioffe Institute, Politechnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Anatoly Starukhin
- Ioffe Institute, Politechnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Boris Krichevtsov
- Ioffe Institute, Politechnicheskaya 26, 194021 Saint Petersburg, Russia
| | - Hongjun Zhang
- School of Instrument Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
| | - Fangzhe Li
- School of Materials Sciences and Engineering, Harbin Institute of Technology, Harbin 150080, China
| | - Huijiadai Luo
- School of Materials Sciences and Engineering, Harbin Institute of Technology, Harbin 150080, China
| | - Hua Ke
- School of Materials Sciences and Engineering, Harbin Institute of Technology, Harbin 150080, China
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Enikeeva MO, Proskurina OV, Levin AA, Smirnov AV, Nevedomskiy VN, Gusarov VV. Structure of Y0.75La0.25PO4·0.67H2O rhabdophane nanoparticles synthesized by the hydrothermal microwave method. J SOLID STATE CHEM 2023. [DOI: 10.1016/j.jssc.2022.123829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Croconic Acid Doped Triglycine Sulfate: Crystal Structure, UV-Vis, FTIR, Raman, Photoluminescence Spectroscopy, and Dielectric Properties. CRYSTALS 2022. [DOI: 10.3390/cryst12050679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Triglycine sulfate (TGS) single crystals doped with croconic acid (CA) were grown by evaporation from aqueous solutions. X-ray diffraction analysis shows a slight reduction in unit cell volume in TGS:CA compared to pure TGS crystals. The polarized Raman and near-infrared absorption spectra show that the positions of most lines resulting from inter- and intramolecular vibrations are in good agreement with those in spectra of undoped TGS crystals. The inclusion of CA in TGS is confirmed by the presence of bands characteristic of CA in the infrared-Fourier transform spectra. The ultraviolet-visible absorption spectra of TGS:CA are characterized by the presence of additional absorption bands (compared to the spectra of pure TGS) located in the transparent region of pure TGS. In the photon energy region 1.6–3.6 eV, a strong “green” luminescence band is present in TGS:CA upon excitation at λ = 325 nm. The position of the emission band depends on the wavelength of the exciting light. Doping of TGS with CA causes pinning of domain walls, which is accompanied by a decrease in amplitude and frequency dispersion of the dielectric anomaly at the phase transition, a decrease in the switchable polarization and an increase in the coercive field of hysteresis loops.
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