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.

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.

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.

Journal of Structural Chemistry. Vol. 58, No. 2, March 2017, pp. 399-405

S. V. Paston, A. M. Polyanichko, O. V. Shulenina

STUDY OF DNA INTERACTIONS WITH Cu²⁺ AND Mg²⁺ IONS IN THE PRESENCE OF CAFFEINE

Journal of Structural Chemistry. Vol. 58, No. 2, March 2017, pp. 399-405

DOI: 10.1134/S0022476617020263

A study of caffeine effects on the complexation of the DNA molecule with Cu²⁺ and Mg²⁺ ions in solution is presented. DNA binding with cations and caffeine is traced from changes in DNA circular dichroism and UV absorption spectra. The complexation of caffeine with M²⁺ ions is studied by IR spectroscopy. Caffeine is found to form complexes of different structure with Mg²⁺ and Cu²⁺ ions in solution. In the presence of caffeine, DNA solutions with MCl₂ show signs of formation of intricate complexes involving nitrogenous bases. In DNA solutions with CuCl₂, the presence of caffeine causes additional destabilization of the secondary DNA structure. In DNA solutions with MgCl₂, the presence of caffeine leads to the formation of new complexes with the participation of Mg²⁺, caffeine, and bases without disrupting the secondary DNA structure.

15.03.2017 Лаборатория СПбГУ — для юных физиков из области

На лабораторной площадке Ресурсного образовательного центра по направлению «физика» прошел первый урок для областных школьников.

Практические занятия для  старшеклассников из Ленинградской области на базе лабораторной (экспериментальной) площадки Ресурсного образовательного центра Санкт-Петербургского государственного университета по направлению физика будут проходить в рамках соглашений о сотрудничестве между СПбГУ и образовательными учреждениями Ленинградской области.

Первыми возможность закрепить учебную программу по физике получили ученики 10 класса Сосновоборского лицея № 8. Лекцию на тему «Двигатель Стирлинга», а также лабораторные работы на современном оборудовании для них провел победитель областного конкурса «Учитель года», преподаватель лицея Алексей Граков.

Подробнее: 15.03.2017 Лаборатория СПбГУ — для юных физиков из области