Self-Assembling Systems Based on Pillar[5]arenes and Surfactants for Encapsulation of Diagnostic Dye DAPI

In this paper, we report the development of the novel self-assembling systems based on oppositely charged Pillar[5]arenes and surfactants for encapsulation of diagnostic dye DAPI. For this purpose, the aggregation behavior of synthesized macrocycles and surfactants in the presence of Pillar[5]arenes functionalized by carboxy and ammonium terminal groups was studied. It has been demonstrated that by varying the molar ratio in Pillar[5]arene-surfactant systems, it is possible to obtain various types of supramolecular systems: host–guest complexes at equimolar ratio of Pillar[5]arene-surfactant and interpolyelectrolyte complexes (IPECs) are self-assembled materials formed in aqueous medium by two oppositely charged polyelectrolytes (macrocycle and surfactant micelles). It has been suggested that interaction of Pillar[5]arenes with surfactants is predominantly driven by cooperative electrostatic interactions. Synthesized stoichiometric and non-stoichiometric IPECs specifically interact with DAPI. UV-vis, luminescent spectroscopy and molecular docking data show the structural feature of dye-loaded IPEC and key role of the electrostatic, π–π-stacking, cation–π interactions in their formation. Such a strategy for the design of supramolecular Pillar[5]arene-surfactant systems will lead to a synergistic interaction of the two components and will allow specific interaction with the third component (drug or fluorescent tag), which will certainly be in demand in pharmaceuticals and biomedical diagnostics.

Complex formation of REEs with polydentate organic ligands

Исследовано комплексообразование европия и тербия с полифункциональными органическими соединениями – β-дикетонами, органическими кислотами. Состав комплексов изучен экстракционным методом, ИК и люминесцентной спектроскопией. Установлено, что при экстракции РЗЭ смешанными экстрагентами идет эффективное комплексообразование РЗЭ в органической фазе. Показана возможность синтеза из насыщенных экстрактов разнолигандных координационных соединений РЗЭ, выделены индивидуальные кристаллические комплексы. The complex formation of europium and terbium with polyfunctional organic compounds: β-diketones, organic acids were investigated. The composition of the complexes was studied by extractive method, infrared and luminescent spectroscopy. It was established that during the extraction of REE by mixed extractants there is an effective complex formation of REE in the organic phase. The possibility of synthesis of different ligand coordination compounds of REE from saturated extracts was shown and individual crystalline complexes were isolated.

Структурные особенности фосфатов Ca-=SUB=-9-x-=/SUB=-M-=SUB=-x-=/SUB=-Dy(PO-=SUB=-4-=/SUB=-)-=SUB=-7-=/SUB=- (M=Zn-=SUP=-2+-=/SUP=-, Mg-=SUP=-2+-=/SUP=-)

Solid solutions of phosphate with whitlockite-type Ca9-xMxDy (PO4) 7 (M = Zn2 +, Mg2 +) were obtained. The samples were studied by a complex of methods, such as X-ray phase analysis, second harmonic generation, and luminescent spectroscopy. It was established that in the series of solid solutions a change in the symmetry of the unit cell R3c-> R 3c is observed during Ca2+ -M2+ substitution, and the concentration dependence was determined. The phase transitions of the ferroelectric and antiferroelectric type and their temperature position were established by dielectric spectroscopy. The synthesized samples demonstrate intense luminescence with 350 nm excitation and the resulting radiation is in the white region of color coordinates (CIE).

Interaction Between PbF2 and EuS in Saline Melt NaCl-KCl

Ability to interaction between PbF2 and EuS in NaCl-KCl saline melt is established by methods of luminescent spectroscopy and the X-ray diffraction analysis. Mutual quenching of intensive blue luminescence of Eu2+ and, partially, of yellow luminescence of PbF2 in the solidified solutions-melts on the basis of NaCl-KCl is observed, that confirms exchange reaction with formation of PbS particles. Formation of abnormal phases "NaCl" and "KCl" with the changed parameters of lattices, and also of PbFCl phase is revealed, and also possibility of occurring phases of PbS, β - PbF2 and NaF in separate specimens is not excluded.