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REVIEWS  ON  ADVANCED  MATERIALS   SCIENCE Volume 47, No. 1, Pages 71-77

O.Yu. Kurapova, V.G. Konakov, A.S. Grashchenko, N.N. Novik, S.N. Golubev and I.A. Ovid’ko

NANOTWINNED COPPER-GRAPHENE COMPOSITES WITH HIGH HARDNESS

REVIEWS  ON  ADVANCED  MATERIALS   SCIENCE Volume 47, No. 1, Pages 71-77

This paper addresses fabrication, structure, and hardness characteristics of nanotwinned (ntw) copper-graphene composites. The composites were fabricated by electrodeposition from 1M CuSO₄·6H₂O mixed water-alcohol solution containing graphene-graphite mixture stabilized by non-ionic surfactant. We fabricated two-layer solids each consisting of ntw copper layer and ntw copper-graphene layer. The synthesized two-layer specimens were examined in nanoindentation tests and showed high hardness values up to 3 GPa. The maximum hardness value of 3 GPa is higher than those of pure ntw copper and copper-graphene composites, taken from the literature.

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Dalton Transactions Issue 12, Pages 3895-3905

Anastasia I. Solomatina, Irina O. Aleksandrova, Antti J. Karttunen, Sergey P. Tunik, Igor O. Koshevoy

Dibenzothiophene-platinated complexes: probing the effect of ancillary ligands on the photophysical performance

Dalton Transactions Issue 12, Pages 3895-3905

DOI: 10.1039/C7DT00349H

Cyclometalation of dibenzothienyl-pyridine (HPyDBT) afforded a series of platinum(II) complexes Pt(PyDBT)(L)Cl (L = DMSO, 1; P(p-C₆H₄-X)₃ (X = H, 2; CF₃, 3; OMe, 4; NPh₂, 5); 1,3,5-triaza-7-phosphaadamantane, 6; 2,6-dimethylphenyl isocyanide, 7). Chelating bidentate LL ligands formed cationic compounds [Pt(PyDBT)(LL)]⁺ (LL = 1,2-bis(diphenylphosphino)benzene, 8; 2,2’-bipyridine, 9; 1,10-phenanthroline, 10). Oxidation of a thienyl sulfur atom allowed for the isolation of the sulfone derivative Pt(PyDBT)(PPh₃)Cl (11). The title complexes were characterized crystallographically (except 7). Investigation of their photophysical behavior revealed solid state phosphorescence with quantum yields up to 0.45 for neat powders. The ancillary ligands L show a minor influence on the emission energies of the neutral compounds, but affect dramatically the intensity of luminescence. In contrast, the cationic species with diimine ligands demonstrate a significant contribution of the LL fragments into the emissive T₁ states that leads to a certain mixing of ³IL and ³LL’CT transitions and causes a substantial bathochromic shift of emission.

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Glass Physics and Chemistry, 2017, Vol. 43, No. 4, pp. 298–301

A. A. Razumtsev, Yu. S. Tver’yanovich, Fahd S. Khan, I. E. Kolesnikov, and A. V. Kurochkin

«Spectral Properties of Glass (15Ga₂S₃ · 85GeS₂) Doped with Erbium»

Glass Physics and Chemistry, 2017, Vol. 43, No. 4, pp. 298–301

DOI: 10.1016/j.jnoncrysol.2016.11.038

For chalcogenide glasses in the system (1 – x)[0.15Ga₂S₃ · 0.85GeS₂] · xEr₂S₃, the absorption and luminescence spectra are investigated and the X-ray diffraction analysis is performed. A small shift in the position of the erbium absorption band with the increase of its content in the glass indicates the decrease of the effective charge on it, while the negligible changes in the angle position of the first sharp diffraction peak points to the constancy of the glass’s intermediate-order parameter. The possibility of describing the dependence of the intensity of erbium luminescence on its concentration using the earlier suggested equation has been discussed.

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Journal of Molecular Liquids Volume 230, March 2017, Pages 113–120

V.S. Fundamensky, T.A. Kochina, Y.A. Kondratenko, A.A. Zolotarev, Yu.G. Vlasov, I.S. Ignatyev

Ionic liquids based on triethanolammonium salts of dicarboxylic acids (oxalic, malonic, succinic). Crystal structure and cation-anion interaction

Journal of Molecular Liquids Volume 230, March 2017, Pages 113–120

DOI: 10.1016/j.molliq.2016.12.111

The series of ionic liquids based on triethanolammonium salts of dicarboxylic acids (oxalic, malonic and succinic) was synthesized, characterized by IR and H¹, C¹³ NMR spectroscopy, thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Their structure was determined by single-crystal X-ray diffraction. It was found that triethanolammonium [(HOCH₂CH₂)₃NH]+ cations in salts of oxalic (1), malonic (2) and succinic acids (3) containing monoanions [OOC(CH₂)_nCOOH]- (n=0-2) have the endo conformation and the ammonium proton (Ham) resides inside the “lampshade” formed by three CH₂CH₂OH branches connected with nitrogen atom. The asymmetric cell of the second modification of the succinic acid salt (4) includes two triethanolammonium cations and a succinate dianion [(HOCH₂CH₂)₃NH]₂+[OOC(CH₂)₂COO]₂-. In this salt (4) one CH₂CH₂OH branch of the triethanolammonium cation is rotated around the N-C bond (endo-exo conformation) and forms infinite TEA chains. This pattern was firstly found in organic salts of TEA. The obtained results show that different structures of triethanolammonium cations in the salts of dicarboxylic acids have significant influence on the cation-anion interaction.

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17.03.2017 в РЦ ОЛМИВ состоялся визит сотрудников отдела научно-технической экспертизы Государственного Эрмитажа: Гавриленко Л.С.Ю Григорьева И.А., Чугунова К.С. и Одриковская А.Ю. Обсуждались вопросы научно-технического сотрудничества.