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The reaction of 4,4,5,5,6,6,6-heptafluoro-1-(1-methyl-1H-pyrazol-4-yl)hexane-1,3-dione (HPyrC3F7) with freshly precipitated hydrated europium(ɪɪɪ) and samarium(ɪɪɪ) hydroxides in EtOH afforded crystalline complexes of the composition [Ln(PyrC3F7)3(EtOH)2], the features of their formation depending on the stoichiometric ligand/metal ratios were studied. The structure and composition of the complexes were characterized by physicochemical methods, including single-crystal X-ray diffraction. The luminescent properties of these compounds in the crystalline state and in solutions were studied in detail. Possible ways of transferring electronic excitation in the complex [Eu(PyrC3F7)3(EtOH)2] were considered. [ABSTRACT FROM AUTHOR]

The reactions of LaCl and YCl with 1,3-bis(1,3-dimethyl-1 H-pyrazol-4-yl)propane-1,3-dione (HL) and 1,10-phenanthroline (Phen) in the presence of a base afford complexes [La(L)(Phen)] ( I) and [Y(L)(Phen)] ( II). Unstable solvates I · iso-PrOH ( III) and II · iso-PrOH ( IV) are obtained from solutions of the complexes in 2-propanol, and their structures are determined by X-ray diffraction analysis (CIF files CCDC 1026802 ( III) and 1026808 ( IV)). The compositions of the complexes are additionally studied by H, C, Y, and La NMR methods. Fragmentation is studied by laser desorption/ionization (LDI) and electrospray ionization (ESI) mass spectrometry. [ABSTRACT FROM AUTHOR]

Neutral [EuLPhen] complexes were synthesized by the reaction of EuCl with heterocyclic diketones-1-(1,5-dimethyl-1 H-pyrazol-4-yl)-4,4,4-trifluoro-1,3-butanedione and 4,4,5,5,6,6,6-heptafluoro-1-(1-methyl-1 H-pyrazol-4-yl)-1,3-hexanedione-and 1,10-phenanthroline (Phen) in an aqueous alcohol solution in the presence of NaOH. The reaction of GdCl with the same diketones under analogous conditions, but without adding 1,10-phenanthroline, yielded [GdL(HO)] complexes. The composition of the complexes was determined by elemental analysis, and their optical and luminescent properties were examined. [ABSTRACT FROM AUTHOR]

n-ZnO/ p-GaN:Mg heterostructures have been produced by the thermal oxidation of thin Zn layers using radical-beam gettering epitaxy. The structural and electroluminescent properties of the n-ZnO/ p-GaN:Mg heterostructures have been studied. [ABSTRACT FROM AUTHOR]

The results of the study of photoluminescence and its excitation spectra in Tl xCu1− xGaSe2 single crystals are presented. The crystals under study are layered and characterized by anisotropic optical properties. In this respect, it is important to investigate optical properties of the crystals under study. [ABSTRACT FROM AUTHOR]

Six new complexes of the ligand HQ cy (-4-(cyclohexanecarbonyl)-5-methyl-2-phenyl-2,4-dihydro-3H-pyrazol-3-one) and Ln 3+ ions with emission in the near-infrared (Nd 3+ ) or visible and near-infrared (Sm 3+ , Pr 3+ ) spectral regions were synthesized and characterized using various methods, including single crystal X-ray diffraction. The study demonstrated that both tris complexes [LnQ cy 3 (H 2 O)(EtOH)] and tetrakis-acids [H 3 O][LnQ cy 4 ] can be synthesized by varying the synthetic conditions. The photochemical properties of the complexes were investigated experimentally and theoretically using various molecular spectroscopy techniques and Judd-Ofelt theory. The objective was to quantitatively and qualitatively disclose the influence of complex stoichiometry on its luminescence properties. The study showed that the addition of an extra ligand molecule (in the tetrakis species) increased molar extinction by up to 2 times, affected the shape of photoluminescence spectra, especially of the Pr 3+ complex, and increased the quantum yield of the Sm 3+ complex by up to 2 times. The results obtained from this study provide insights into the luminescent properties of lanthanide coordination compounds, which are crucial for the design and development of novel photonic materials with tailored photophysical properties.