The reaction of Na2-x{H}x[Mo6I8(BTA)6] with [tBuXPhos-Ag(OTf)(CH3CN)] (tBuXPhos - 2-di-tert-butylphosphino-2 ',4 ',6 '-triisopropylbiphenyl) leads to the strongly emissive solid heterometallic complex [Mo6I8(BTA-Ag(tBuXPhos))6](OTf)4.

New biocompatible luminescent materials based on cyclic dipeptides were prepared. For this, the thermal properties of dipeptides L-alanyl-L-leucine and L-leucyl-L-alanine and the kinetics of their cyclization in the solid-state upon heating are studied for the first time. Using isoconversion kinetics approaches, the kinetic parameters of the reactions and the models describing these processes are determined. The influence of the amino acid residue sequence in dipeptide molecules on their thermal properties and the activation energy of the cyclization reaction is discussed. A way to control the self-assembly of a cyclic dipeptide to obtain various ordered structures is demonstrated. The microstructures of the cyclic dipeptides have luminescent properties and can be used in optical devices.

We used a 55 nm [Ru(dipy)3]2+@SiO2 nanophosphore as a temperature sensor under photobleaching conditions. We have calibrated these nanoparticles for temperature measurements using/analyzing both luminescence intensity and decay time change. We show that an exposure to a 405 nm semiconductor laser with a power flux density of 2 kW/cm2 leads to a two-fold decrease in luminescence intensity over time. At the same time (4 h), the characteristic decay time of the luminescence decreases by approximately half. We demonstrate that a ratiometric method is more reliable for temperature measurements in the range from 300 to 350 K. This method takes approximately half the time required to measure the kinetics of luminescence decay.

NaYF4:Yb3+/Er3+/Tm3+ particles are synthesized in the form of rods with dimensions of 0.21 × 0.77 μm. They exhibit upconversion luminescence in the visible and near-infrared spectral ranges when irradiated at a wavelength of 980 nm. The possibility of using them as multimodal luminescent sensors with temperatures in the range of 250–350 K is shown ratiometrically, based on the emergence of spectral bands at wavelengths of 525, 545, 655, 700, and 805 nm, of particular interest for biological applications.

The variety of binding sites in BSA opens up possibilities for its use in developing systems with different functionality. However, the facile methods to develop co-loaded BSA nanoparticles (BNP) with luminescent and catalytic functions have not yet been fully explored. The luminescent lipophilic Pt2+ complex loaded into BNP via its outer-sphere binding to the hydrophobic regions of unfolded BSA serves as a luminescent probe to visualize the binding of Cu2+ ions followed by the Cu2+ → Cu+ reduction step and subsequent removal of these ions from BNP by glutathione. The specificity of luminescence and electrochemical behavior of co-loaded BNP reveals both a significant mutual influence of Cu(I) and Pt(II) centers and the influence of the co-loading method on these effects. The modification of the method allows changing the amount of copper ions per BNP, the luminescence of the complex and the laccase-like activity of copper ions bound to BNP. The latter activity was demonstrated using the oxidative conversion of adrenaline to adrenochrome. The above trends indicate that co-loading of redox-active copper ions and luminescent Pt(II) complex into BNP provides a route for combining sensing and catalytic activities, which can be tuned by modifying the synthetic method.

Trends in changes in nonlinear optical (NLO) coefficients, d33, measured by the second harmonic generation technique for composite polymer materials doped with D-pi-A chromophores containing novel (quinoxalinylmethylene)malononitrile acceptor and various bulky groups in aniline donor (load 25/35 wt%), have been established. Structural modifications provided almost three-fold growth of material NLO activity at high chromophore load.

We studied the morphological, structural, and optical studies of hydrophobic up-conversion NaYF4:Yb/Ho nanoparticles synthesized by the thermal decomposition method. To impart hydrophilic properties, the NaYF4:Yb/Ho nanoparticles were silanized using the following nonionic surfactants: Triton X-114, Tween 85, and PEG monooleate. As a result, a silicate shell formed on the surface of the nanoparticles, providing hydrophilic properties and stable colloidal solutions in water while maintaining their luminescent characteristics. The use of the most effective surfactant, Triton X-114, for silanization allowed for obtaining a narrow size distribution of NaYF4:Yb/Ho@SiO2 nanoparticles. The study of the temperature dependencies of luminescence spectra indicates the high potential of NaYF4:Yb/Ho and NaYF4:Yb/Ho@SiO2 nanoparticles for use as luminescent temperature probes.

D-π-A chromophores based on novel macroacceptors − fused azinylmethylenemalononitriles (fused azine = pyrido[2,3-b]pyrazine, quinoline, quinoxaline and quinoxalin-2-one) − have been synthesized and their linear and nonlinear optical properties in gas, solution and in poled PMMA-based films have been investigated by DFT, UV-vis and second harmonic generation technique. The transition from chromophores with an azine acceptor to ones with azinylmethylenemalononitrile acceptors leads to a 10-fold increase in calculated μβ values. Poled polymer films doped with studied chromophores at 25wt% load exhibit quadratic nonlinear optical activity with d33 values up to 42 pm/V.

The interaction of 2-(thiophen-2′-yl)ethylphosphine, paraformaldehyde, and benzhydrylamine or 1-methylbenzylamine resulted in 1,5-diaza-3,7-diphosphacyclooctanes, which were used for the synthesis of P,P-bischelate copper(i) complexes. The obtained compounds were characterized by NMR spectroscopy, mass spectrometry, and elemental analysis. The study of the luminescent properties of the copper(i) complexes demonstrated that they are solid-state singlet luminophores. Their biological activity was investigated. They were shown to be inactive against gram-positive and gram-negative bacteria and exhibited a low cytotoxicity, which determined their potential use as luminescent sensors for biological applications.

Our study compares the structural, photophysical, and electrochemical characteristics of 3,4,5- triphenyl-1-neomenthyl-1,2-diphosphole (1) and 3,4,5-triphenyl-1-mesityl-1,2-diphosphole (2). Experimental and optimized geometries of 1-R-1,2-diphospholes are close to each other and imply a significant delocalization within the 1,2-diphosphole ring for both molecules. Both compounds exhibit a green solid-state emission, whereas the DCM solutions are non-emissive. The preliminary electrochemical oxidation followed by electrochemical reduction leads to the anion-radical paramagnetic form, which is stable for 1-aryl-1,2-diphosphole, but unstable for 1-alkyl-1,2-diphosphole. The radical nature of 2(center dot-) was confirmed by in situ EPR-spectroelectrochemistry along with DFT calculations and in situ UV/Vis-spectroelectrochemistry.

The reaction of [NiBr(aryl)(bpy)] organonickel complexes with sodium 1,2-diphospholide leads to unknown 1-aryl-1,2-diphospholes by aryl group transfer.

The energy interactions that arise between the anisometric mesogenic gadolinium complex, which exhibits nematic and smectic liquid crystalline (LC) properties in certain temperature ranges, and paramagnetic quantum dots (QD) Cd0.9Mn0.1S/ZnS with "core -shell" structure, in the films obtained by melt crystallization between quartz glasses have been studied. QD and LC composites were prepared by co -dispersing of the components in toluene, followed by removal of the solvent. It has been shown that the luminescence intensity of the ligand environment of the complex increases significantly when it is doped with paramagnetic QDs as a result of partial energy transfer between the components. The effect of quantum dots doping on the liquid crystalline properties of the complex was also studied. The distribution of quantum dot aggregates in the LC matrix of the Gd(III) complex was studied by polarization optical microscopy. It is shown that the aggregates of quantum dots are uniformly distributed within the matrix of the complex.

Nonlinear optical (NLO) activity of polymer materials doped with 30 and 40 wt% load of two novel thermally stable quinoxaline-based chromophores with bulky TBDPSO groups in donor fragments was studied by second harmonic generation technique. Poled thin polymer film with chromophore B containing five various bulky substituents demonstrates low d(33) values (14-19 pm/V). Oppositely, composite material with 30 wt% load of chromophore A, which does not contain bulky substituents in acceptor moiety, have shown enhanced NLO activity (up to 51 pm/V).

NaYF4:Yb,Er particles are synthesized hydrothermally in the form of rods with an average size of 1.4 µm × 70 nm. Their surfaces are modified with L-cysteine, which gives them hydrophilic properties. It is shown that the modified particles exhibit upconversion luminescence in the visible spectral range upon 980-nm laser excitation. They are temperature calibrated in a physiological solution. The possibility is shown of making remote temperature measurements in the biologically relevant 293–323 K range of temperatures with an average sensitivity of 43 × 10−4 K−1 and an accuracy of ±1.0 K. A demonstration experiment is performed on the living nervous system of the grape snail Helix lucorum. Nanosensors are used for bioimaging and remote low-invasive temperature measurements with a spatial resolution of 10 µm.

NaYF 4 :Yb,Er upconversion nanoparticles are obtained via hydrothermal synthesis. To give nanoparticles hydrophilic properties without major changes in their photophysical characteristics, their surfaces have been modified by replacing the oleate shell with L-cysteine molecules. No fading of the luminescence of the modified upconversion nanoparticles is observed for months.

Novel D–π–A–π–A′ chromophores with different substituents in the donor moiety were synthesized and NLO coefficients for composite polymer materials doped with them were measured.

Parameters of synthesis are varied to fabricate NaYF 4 :Yb,Er phosphors with expressed upconversion properties when excited at a wavelength of 980 nm. Data from luminescence spectroscopy shows the particles exhibit temperature sensitivity in the range of 240–350 K, allowing temperature to be measured ratiometrically.

Methacrylic copolymers with various content of chromophore-containing units in the side chain were synthesized by radical copolymerization; chromophore moieties contain quinoxaline π-electron bridges. Reducing AIBN initiator content in reaction mixture from 10 to 5 wt

The photophysical properties of a series of D-π-A chromophores, where D is represented by di- or trialkylaniline moiety, π – vinylene, A - quinoxaline, quinoxalinone, quinoline, benzothiazole and thiophenecarboxaldehyde, have been analyzed upon acidification. In all cases, appearance of the second emission band is associated with protonation of the nitrogen atom in the donor fragment. Nevertheless, the simultaneous appearance of two emission bands at equal amounts of acid is observed only for dyes with a quinoxalinone acceptor fragment, which suggests the crucial role of the latter in providing dual emission upon acidification. The highest pH sensitivity has been achieved for the dye with an ethyl group at the ortho-position of benzene ring relative to the vinylene bridge. In contrast, the variation of substituents at the aniline nitrogen atom, the protonation of which causes the appearance of the emission under acidic conditions, does not lead to significant changes in pH sensitivity.

Results are presented from testing the temperature of a two-phosphor composite ([Ru(dipy)3]2+@SiO2 and NaYF4:Eu, Gd) in order to determine the prospects for its application as a luminescent thermal sensor in the range of 200–310 K. By calibrating the temperature dependences of individual spectral components of emissions produced upon irradiation with a cw laser at 405 nm, the possibilities of temperature sensing by means of ratiometric method are analyzed in four different spectral ranges of the composite’s visible luminescence.