Ilya V. Taydakov

α-KY ₃ F ₁₀ and δ-KY ₃ F ₁₀ · nH ₂ O single phases were obtained in the KF-YF ₃ system through precipitation from aqueous solutions. The phase composition of the final product depends on the order of reagent addition: the addition of yttrium nitrate to potassium fluoride leads to α-KY ₃ F ₁₀ , while addition of potassium fluoride to yttrium nitrate results in hydrated δ-KY ₃ F ₁₀ · nH ₂ O. The particle size for α-KY ₃ F ₁₀ was 42 nm, while for δ-KY ₃ F ₁₀ · nH ₂ O – 400 nm. DSC-TG analysis showed a δ → α phase transition temperature at 430 ^◦ C and allowed estimating the crystallization water content in the δ -phase sample (1.8 moles per formula unit). In the KF–YF ₃ system, Stokes phosphors doped with 5 mol.% Eu ³⁺ were further synthesized. The KY ₃ F ₁₀ :Eu ³⁺ phosphor exhibited a high degree of crystallinity compared to that of KY ₃ F ₁₀ · nH ₂ O:Eu ³⁺ . The composite material consisting of the polymer matrix lacquer and the KY ₃ F ₁₀ :Eu ³⁺ phosphor nanoparticles demonstrated intense luminescence in the visible range under UV excitation, showing high promise for anti-counterfeiting.

Novel 4,6-dicyanobenzene-derived photocatalysts exhibit enhanced excited-state oxidation potentials while maintaining significant reducing ability, outperforming the well-known 4CzIPN in several challenging photocatalytic reactions.

Coordination polymers based on the [{Mo ₆ I ₈ }(CN) ₆ ] ²⁻ cluster exhibit bright photo- and X-ray induced luminescence in the red and near-infrared regions.

Сyclocondensation of phenyl, ortho-bromophenyl, para-phenylphenyl, para-methoxycarbonylphenyl, para-tolyl and para-methoxyphenyl boronic acid with curcumin in the presence of K3PO4 upon refluxing in 1,4-dioxane for 24 h leads to the formation of curcumin-based 2,2-diaryl-1,3,2-dioxaborines in good yields. The absorption-emission spectra of the synthesized fluorescent conjugates and 1,3,2-dioxaborine with para-biphenyl boronic substituent demonstrated the highest quantum yield. Among the compounds studied, conjugate curcumin with para-methoxycarbonylphenyl boronic substituent demonstrated the highest cellular internalization via flow cytometry and laser confocal scanning microscopy in human breast adenocarcinoma cell line across all incubation times.

Contrary to conventional design principles, ligand perfluorination quenches Eu ³⁺ and Tb ³⁺ luminescence via charge-transfer states, while the Gd ³⁺ analogue exhibits bright room-temperature phosphorescence.

Two tropolonate Yb( iii ) complexes, including the new [YbT ₃ (Bath)]·0.5EtOH were synthesized and showed to exhibit SMM and NIR-thermometric properties.

Synthesis and photoluminescence study of Eu ³⁺ complexes with XPh ₃ -substituted β-diketones (X = Si, Ge, Sn), revealing LMCT-based quenching and identifying the Si derivative as the most efficient.