This works deals with isolation of chloro complexes of platinum metals, in particular [IrCl6]3– and [IrCl6]2–, from hydrochloric acid solutions with different content of chloride ions by sorption method. Sorbents used were modified silicas obtained by the chemical grafting of short-chain polyethyleneimines (PEI) to their surface followed by crosslinking and quaternization to form a thin layer of supported ionic liquids. A PEI with low molecular weight (MW 600, ~12 units) and preferably linear molecules was selected. Mobility of polyethyleneimine chains determines the possibility of its multipoint grafting to silica surface. Procedures for the synthesis of sorbents and their structural characteristics have been reported. Dependences of Ir(III) and Ir(IV) sorption on HCl, H+, and Cl– concentration have been revealed. Sorption equilibrium is reached over 2–5 min, which is typical for materials based on mesoporous silica and indicates anion-exchange mechanism of binding. A hot NH4Cl solution has been used for the quantitative desorption of Ir(IV) ions. The sorbents were tested for separation of Ir(IV) from Pt(IV) and Rh(III). Obtained results may be recommended for the recovery of platinum metal ions from chloride solutions of complex composition.

The method for grafting dithiacrown ether and its linear analogue to the silica surface using preliminary prepared organosilicon derivative is developed. The importance of the acylation step in the process of grafting is underlined. The acylation is required to prevent sorption of platinum metals complex anions by the anion exchange mechanism, the probability of which increases due to protonation of the spacer in an acidic medium. The interaction of palladium(II) with anchored ligands in hydrochloric acid media was studied in details. The comparative study of two sorbents revealed that the macrocyclic effect plays a negligible role in binding of palladi um(II) ions. Therefore, linear ligands are preferred for the development of sorbents for molecular recognition of platinum metals ions.

Cerium(III) nitrate and urea solution mixture were treated by hydrothermal and microwavehydrothermal methods, as a result cerium(III) carbonate hydroxide nanoparticles (22-37 nm) were obtained. Cerium(III) carbonate hydroxide nanoparticles, encrusted by palladium were obtained using palladium reduction process from cerium(III) carbonate hydroxide solution. It is shown, that palladium occurrence disturbs hard hydrogen bond system, leading to carbonate hydroxide nanoparticles structure disorder and also increases efficiency of catalytic reactivity process.

Synthesis conditions are optimized to obtain η-phase/zeolite and Hombifine N/zeolite nanocomposites by the modified cold-impregnation method (method 1), which consists of the codispersion of the samples containing the η-phase or Hombifine N with nano-anatase in a dilute KOH solution, and Beta(25) and ZSM-5 zeolites with different modulus, MOR and Y, for the first time, as well as by the TiO 2 /zeolite in situ method (method 2), which consists of the addition of zeolites into the reaction mixture during the synthesis of titanium dioxide. The starting components and nanocomposites are characterized by different methods, such as wide- and small-angle Х-ray scattering, scanning electron microscopy, and low-temperature nitrogen adsorption (the Brunauer–Emmet–Teller method). The interaction between nanosized titanium dioxide (NTD) and zeolites (except Y) during the formation of the NTD/zeolite nanocomposite (method 2) and the η-phase/MOR nanocomposite (method 1) is revealed, and the presence of NTD in the nanocomposites in nanocrystalline (Hombifine N/zeolite) or amorphous (η-phase/Beta(25) and η-phase/ZSM-5(300)) states is established. It is found that the use of microwave and ultrasonic treatment upon the synthesis of the nanocomposite gives rise to the uniform distribution of spherical particles in the samples; furthermore, they are the same size (η-phase/ZSM-5(12), η-phase/ZSM-5(300), and η-phase/Y) or smaller (η-phase/MOR, η-phase/Beta(25), and η-phase/ZSM-5(40)) when compared to the original η-phase. The size of spherical particles in the η-phase/ZSM-5(40) nanocomposite is comparable with the starting ZSM-5(40) zeolite. It is found that the preparation of nanocomposites by method 2 leads to an increase in the specific surface for the NTD/ZSM-5(12) and NTD/Y nanocomposites and to a decrease in the specific surface for the remaining nanocomposites (most significantly for NTD/MOR) when compared to the zeolite matrix, and promotes the high adsorption capacity of the NTD/zeolite nanocomposites with regard to the extraction of the P(V) ions from the model aqueous system with the maximum value (99.48%) for the NTD/MOR nanocomposite.

The effect of carbon nanofillers (CNF) on the properties of EPDM is studied by a complex of methods. The elastomer was first modified with a curative group (sulfur, zinc oxide, stearic acid, dibenzothiazolylsulfide and tetramethyltiuramdisulfide), and then with CNF. It was found that both the structure and size of the carbon nanofillers affect the properties of EPDM. The addition of nanofibers (Р11) results in an increase in the molecular mobility and strength of the elastomer. The addition of smaller nanotubes results in a glass-transition temperature raise by 8°C.The composition permittivity decreases among Р11, С22, В22 from 7 to 5.

The effect of carbon nanofillers (CNF) on the properties of EPDM is studied by a complex of methods. The elastomer was first modified with a curative group (sulfur, zinc oxide, stearic acid, dibenzothiazolylsulfide and tetramethyltiuramdisulfide), and then with CNF. It was found that both the structure and size of the carbon nanofillers affect the properties of EPDM. The addition of nanofibers (Р11) results in an increase in the molecular mobility and strength of the elastomer. The addition of smaller nanotubes results in a glass-transition temperature raise by 8°C.The composition permittivity decreases among Р11, С22, В22 from 7 to 5.

The preparation, characterization, and catalytic activity of nanocomposites containing palladium nanoparticles supported on yttrium and cerium hydroxycarbonates in the Suzuki cross -coupling reaction between phenylboronic acid and iodobenzene are described. All catalytic systems were characterized by means of SEM, EDS, and their surface areas were determined with N 2 physisorption. The conversion degree of the Suzuki reaction was characterized with gas chromatography, and the reaction products were identified with 1H and 13 C{ 1 H}–NMR spectra. Nanocomposites Pd/Y(OH)CO 3 and Pd/Ce(OH)CO 3 were synthesized according to two methods: the first one—simultaneous production of nanoscale substrate and immobilization of palladium nanoparticles on its surface (nanocomposites 1 ), the second one—the prior synthesis of polyvinylpyrrolidone stabilized palladium nanoparticles followed by their immobilization on the nano-sized substrate surface (nanocomposites 2 ). Both groups of catalysts showed high catalytic activity with the highest TOF values 8.5 × 103 h –1 for nanocomposites 1 and 78.9 × 103 h –1 for nanocomposites 2 allowing to decrease the palladium content in the nanocomposites and, consequently, reduce the cost of the catalyst while maintaining its high catalytic activity.

В качестве генератора наночастиц сульфата бария предложена далекая от равновесия система двух смешивающихся жидкостей. Для объяснения полученных результатов привлечена развитая в настоящей работе динамическая модель переходного слоя, согласно которой наименьший размер образующихся частиц определяется размером ассоциатов предфазы, сформировавшихся во вращающихся ячейках Бенара. Предположено, что граница раздела ячейки Бенара с окружающим раствором обладает определенными барьерными свойствами, по крайней мере, по отношению к проникающим извне частицам прекурсора новой фазы. Исследовано влияние соотношения H2O/тетрагидрофуран на размер частиц, форму ассоциатов и форму нанокристаллов. Получена зависимость размера нанокристаллических частиц от указанного выше соотношения. Предложено возможное объяснение зависимости размера наночастиц от вязкости растворителя.

A highly nonequilibrium system of two miscible liquids is proposed as a generator of barium sulfate nanoparticles. A dynamic transition layer model developed in this work is used to explain the obtained results; according to this model, the smallest diameter of the resulting particles is determined by the size of the prephase associates formed in rotating Benard cells. It is hypothesized that the Benard cell-ambient solution interface has certain barrier properties, at least with respect to the new phase precursor's particles penetrating from outside. The effect of the H2O/tetrahydrofuran ratio on the size of particles and the shape of associates and nanocrystallites is studied. The dependence of the size of nanocrystalline particles on the above ratio is derived. A possible explanation is proposed for the dependence of the size of nanoparticles on the viscosity of a solvent.

Catalytic activity of 10(-4)-10(-5) M solutions of complex chlorides of Ir(III) and Ir(IV) in an indicator reaction of sulfarsazen oxidation by potassium periodate was studied by spectrophotometric and kinetic methods. The preparation recommendations of iridium comparison solutions were given for catalytic method.

The test-method for the determination of iridium, which is based on carrying out the catalytic indicator reaction of oxidation of sulfarsazena with the potassium periodate on paper carrier was offered. Determination is possible in a wide range of iridium concentrations from 0.2 to 2.0 mu g/ml. The detection limit is 0.02 mu g/ml, the error does not exceed Sr = 0.20. The validity of the method was confirmed by the "introduced-found" method.

Dissipation in selenium was investigated using internal friction spectrum for the temperature range -150–250°C and the frequency domain 0.1–10 Hz. It was found that only the use of a combined specimen with isinglass stone undercoat allows the tests of selenium in the mentioned temperature range. For unannealed selenium four local dissipation peaks of the internal friction spectrum were observed in the temperature range -130÷+225°C. Two peaks (α and ) are relaxation peaks, and two others ( c  and С) are nonrelaxation peaks. All observed dissipation peaks of the internal friction spectrum were interpreted on the basis of calorimetric tests results. It was also found that the thermal treatment of selenium results in the annihilation of the α-relaxation peak and strong decrease of the dissipative process С.

Blends based on polyethelene and 1,2-polybutadiene were studied. The influence of methods for obtaining dynamically vulcanized thermoelastoplastic composites on the kinetics of DTPV structure formation, rheological and mechanical characteristics of samples was investigated.

Blends based on polyethelene and 1,2-polybutadiene were studied. The influence of methods for obtaining dynamically vulcanized thermoelastoplastic composites on the kinetics of DTPV structure formation, rheological and mechanical characteristics of samples was investigated.

A single crystal of the [Ir(Thio)2Cl4][Ir(Thio)4Cl2] compound synthesized by the reaction of K3[IrCl6] with thiocarbamide (Thio, SC(NH2)2) in a microwave field is investigated using X-ray diffraction. The compound crystallizes in the monoclinic crystal system with space group Cc(C s 4 ). The unit cell parameters are as follows: a = 13.554(1) Å, b = 8.251(1) Å, c = 24.992(2) Å, β = 92.58(1)°, V = 2791.87(10) Å3, and Z = 4. The compound has an island structure with two crystallographically independent iridium atoms. Thiocarbamide is coordinated to the central atom through the sulfur atom. The coordination sphere of the Ir(1) atom involves two Cl atoms and four S atoms, whereas the coordination sphere of the Ir(2) atom consists of four Cl atoms and two S atoms. The assignment of the bands in the IR absorption spectrum of the synthesized compound is presented. The thermal behavior of the compound in air is investigated.

The date of investigation on chemistry and technology of platinum metals in the large years are presented. The complexes of palladium(II) with macroheterocyclyc compounds are syntesited. The application of electrochemical processes for selection of platinum metals from solutions and applyed of concentrate of platinum metals is shown

The date of investigation on chemistry and technology of platinum metals in the large years are presented. The complexes of palladium(II) with macroheterocyclyc compounds are syntesited. The application of electrochemical processes for selection of platinum metals from solutions and applyed of concentrate of platinum metals is shown