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650 results on '"Sokolov, M. N."'

101. Iodide Bismuth(III) Complexes with 1-Ethyl-3-methylpyridinium: Structure, Thermal Stability, and Optical Properties.

Author

Usol'tsev, A. N., Shentseva, I. A., Shayapov, V. R., Plyusnin, P. E., Korol'kov, I. V., Abramov, P. A., Sokolov, M. N., and Adonin, S. A.

Abstract

Bismuth(III) halide complexes with 1-ethyl-3-methylpyridinium (1-Et-3-MePy)3[Bi2I9] (1) and (1-Et-3-MePy)3[Bi3I12] (2) have been synthesized when BiI3 reacted with 1-ethyl-3-methylpyridinium iodide in organic solvents and characterized by X-ray diffraction analysis. The purity of samples has been confirmed by X-ray powder diffraction analysis. The diffuse reflectance spectra were recorded and the band gap was estimated using the classical Kubelka–Munk formula. The thermal stability has been studied by the TGA method. Based on the results of the data obtained, the following conclusions can be drawn: (i) the structure and composition of the product is affected not only by the ratio of reagents but also by the choice of solvent for the reaction; (ii) the resulting complex compounds have high thermal stability (mass loss begins only at >250°C); (iii) the band gap is 2.11 and 1.96 eV for compounds 1 and 2, respectively. [ABSTRACT FROM AUTHOR]

Published
2022
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102. 1,2,4-TRIAZOLATE CLUSTER COMPLEXES (Bu4N)2[Mo6X8(N3C2H2)6] (X = Br, I).

Author

Mikhaylov, M. A., Berezin, A. S., Sukhikh, T. S., Sheven', D. G., Kompankov, N. B., and Sokolov, M. N.

Subjects
PROTON magnetic resonance, MOLYBDENUM, ELECTROSPRAY ionization mass spectrometry, SINGLE crystals, LUMINESCENCE spectroscopy, MASS spectrometry, X-ray diffraction, ELEMENTAL analysis
Abstract

Two new luminescent cluster complexes (Bu4N)2[Mo6X8(N3C2H2)6]·n(H2O) (1) (X = Br, n = 4) and (2) (X = I, n = 5) are obtained by the reaction of (Bu4N)2[Mo6X8(OOCCH3)6] (X = Br, I) with 1-trimethylsilyl-1,2,4-triazole Me3Si–N3C2H2. Their crystal structures are determined and the luminescent properties of powder samples are studied. According to single crystal X-ray diffraction data, molybdenum atoms are monodentate coordinated by N1 atoms of triazolate ligands at Mo–N distances of 2.154(9)-2.185(9) Å (1) and 2.158(13)-2.21(13) Å (2). The complexes are characterized by electrospray mass spectrometry, proton magnetic resonance, elemental analysis, and IR spectroscopy data. [ABSTRACT FROM AUTHOR]

Published
2022
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105. Azide Coordination to Polyoxometalates: Synthesis of (Bu4N)4.3K0.7[PW11O39FeIIIN3]⋅2.5H2O.

Author

Korenev, V. S., Abramov, P. A., and Sokolov, M. N.

Abstract

A new iron polyoxometalate complex, (Bu4N)4.3K0.7[PW11O39FeIIIN3]⋅2.5H2O (1), has been synthesized in 50% yield by the reaction of K7[PW11O39]⋅14H2O, Fe(NO3)3 ⋅ 9H2O, and NaN3 with subsequent addition of Bu4NBr. The compound has been characterized by elemental analysis, mass spectrometry, and vibrational spectroscopy. The unit cell parameters of 1 have been determined by single-crystal X-ray diffraction: cubic crystal system, space group I 3m, a = 17.82(1) Å, which is typical of salts of Keggin anions with strongly disordered Bu4N+ cations. [ABSTRACT FROM AUTHOR]

Published
2022
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106. STRUCTURAL FEATURES OF THE [(PtW6O24)2H5]11– PROTON-BOUND DIMER.

Author

Kuznetsova, A. A., Abramov, P. A., and Sokolov, M. N.

Subjects
CRYSTAL structure, SINGLE crystals, X-ray diffraction, POWDERS, CESIUM ions, CESIUM, CRYSTALS
Abstract

As a result of crystallization from a solution containing Na5[H3PtW6O24] and Cs2SO4, yellow crystals of a complex are obtained. The composition and structure of the complex are determined by single crystal X-ray diffraction (XRD). The complex has the composition Cs8.1Na2.9[(PtW6O24)2H5]·8H2O (1). For the first time, a proton-bound dimer [(PtW6O24)2H5]11–of two Anderson-type anions is found in its structure. Its phase purity is confirmed by powder XRD for a freshly prepared sample. Sample ageing leads to a loss of water molecules and a change in its crystal structure. [ABSTRACT FROM AUTHOR]

Published
2022
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