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Journal of Non-Crystalline Solids 457 (2017) 164–168

D.V. Pan'kin, М.V. Sukhanov, Yu.S. Tver'yanovich, М.F. Churbanov

«Investigation of structure of GeS_1.35 glasses with the use of isotopically enriched germanium and Raman scattering spectroscopy»

Journal of Non-Crystalline Solids 457 (2017) 164–168

DOI: 10.1016/j.jnoncrysol.2016.11.038

The samples of GeS_1.35 glasses were synthesized with germanium and sulfur of natural isotopic composition and with isotopically enriched germanium (⁷²Ge, ⁷⁴Ge, ⁷⁶Ge). The glasses were investigated by the method of Raman scattering spectroscopy (RSS). It was shown that GeS_4/2 tetrahedrons and structural units containing Ge\\Ge homobonds are present in glasses. The quantum-mechanical calculation of the frequency of fundamental vibrational modes in glass network was carried out. Their dependencies on the atomic mass of germanium were used for identification of bands in RS (Raman scattering) spectra.

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Inorganica Chimica Acta Volume 455, Part 1, 30 January 2017, Pages 9–14

Dmitrii S. Bolotin, Mikhail V. Il’in, Ilya E. Kolesnikov, Vitaliy V. Suslonov, Yuri Novozhilov, Oksana Ronzhina, Mikhail Krasavin, Vadim P. Boyarskiy, Renier Koen, Andreas Roodt

Fluorescent (pyrazolyl acetoxime)ZnII complexes: synthetic, structural, and photophysical studies

Inorganica Chimica Acta Volume 455, Part 1, 30 January 2017, Pages 9–14

DOI: 10.1016/j.ica.2016.10.008

Treatment of pyrazolyl acetoximes p-RC₆H₄{CN(H)NCCH}CH₂C(Me)=NOH (R = OMe, H, F, Cl, CN, NO₂) with 1 equiv of ZnCl₂ leads to the complexes [ZnCl₂(p-RC₆H₄{CN(H)NCCH}CH₂C(Me)=NOH)] (81–91%). These species exhibit fluorescence at room temperature with emission maxima in the region 460–509 nm and biexponential relaxation with τ₁ = 4.63–8.64 ns and τ₂ = 0.482–0.955 ns, respectively. The zinc complexes were characterized by elemental analyses (C, H, N), HRESI-MS, FTIR, ¹H and ¹³C{¹H} NMR, and CP-MAS TOSS ¹³C{¹H} NMR. In addition, two zinc complexes and one pyrazolyl acetoxime were studied by single-crystal X-ray diffraction.

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Dalton Transactions Issue 8, Pages 2516-2523

J.R. Shakirova, E.V. Grachova, V.V. Sizov, G.L. Starova, I.O. Koshevoy, A.S. Melnikov, M.C. Gimeno, A. Laguna, and S.P. Tunik

Polynuclear cage-like Au(I) phosphane complexes based on S²⁻ template: observation of multiple luminescence in coordinated polyaromatic systems

Dalton Transactions Issue 8, Pages 2516-2523

DOI: 10.1039/C6DT04126D

A rational approach to the synthesis of cage-like compounds has been realized to build a new family of sulfido-phosphane Au(I) polynuclear complexes. Ditopic phosphane ligands with an extended aromatic system were used to obtain cage compounds with a clearly determined geometry. Au(I) complexes have been fully characterised in solution using spectroscopy methods, and DFT optimisation of the molecular structure gives additional arguments in favour of the suggested structural patterns. All complexes obtained are luminescent in solution and in the solid state, and display multiple emissions with an unusual combination of two phosphorescence bands and one fluorescence band. DFT calculations show that multiple emissions were mainly determined by ¹IL and metal perturbed ³IL transitions. The ratio of singlet and triplet emission components depends on the distance between the ligand chromophoric centre and Au(I).

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Optical and Quantum Electronics Volume 49, No.1, January 2017, Article 40, Pages 1-9

E. I. Ageev, D. V. Potorochin, D. V. Sachenko, G. V. Odintsova

Generation of web-like structures and nanoparticles by femtosecond laser ablation of silicon target in ambient air

Optical and Quantum Electronics Volume 49, No.1, January 2017, Article 40, Pages 1-9

DOI: 10.1007/s11082-016-0875-5

Silicon nanoparticles were produced by femtosecond laser ablation in ambient air. Obtained samples were studied using dark-field optical microscopy, scanning electron microscopy and Raman-scattering spectroscopy. Two groups of structures can be found: (1) branched amorphous structures with a minimum element size of about 10 nm and incorporations of nanocrystals (0.6–6.6 nm from Raman scattering analysis); (2) larger crystal particles with smooth surface and a typical size of 50–200 nm that provide directional visible light scattering (at dark-field optical microscopy observations). An influence of environment on resulting phase composition of silicon nanoparticles was investigated by numerical evaluation of nanoparticle’s cooling rate. The calculation shows that cooling in ambient air ensures cooling rate sufficient for crystallization.

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Semiconductors Volume 51, No. 1, January 2017, Pages 111–115

D. A. Kudryashov, A. S. Gudovskikh, A. V. Babichev, A. V. Filimonov, A. M. Mozharov, V. F. Agekyan, E. V. Borisov, A. Yu. Serov, and N. G. Filosofov

Nanoscale Cu₂O Films: Radio-Frequency Magnetron Sputtering and Structural and Optical Studies

Semiconductors Volume 51, No. 1, January 2017, Pages 111–115

DOI: 10.1134/S1063782617010110

Nanoscale copper (I) oxide layers are formed by magnetron-assisted sputtering onto glassy and silicon substrates in an oxygen-free environment at room temperature, and the structural and optical properties of the layers are studied. It is shown that copper oxide formed on a silicon substrate exhibits a lower degree of disorder than that formed on a glassy substrate, which is supported by the observation of a higher intensity and a smaller half-width of reflections in the diffraction pattern. The highest intensity of reflections in the diffraction pattern is observed for Cu₂O films grown on silicon at a magnetron power of 150 W. The absorption and transmittance spectra of these Cu₂O films are in agreement with the well-known spectra of bulk crystals. In the Raman spectra of the films, phonons inherent in the crystal lattice of cubic Cu₂O crystals are identified.