Study of Catalytic Activity of the New Nanohybrid Material Based on Gold Nanoparticles and 1,4-bis(Terpyridine-4'-yl)Benzene

The paper describes the synthesis of composite material consisting of 1,4-bis(terpyridine-4'-yl)benzene microcrystals and gold nanoparticles with an average size of 15 nm adsorbed on their surfaces. The nanohybrid material is obtained by the deposition of pre-synthesized nanoparticles on the surface of the organic compound. Mass content of gold in the obtained material is determined by the thermogravimetrical analysis. Catalytic reduction of para-nitrophenol is spectrophotometrically studied. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3512

Evaluation of the psychological state of students at the beginning of the school year

This article discusses the issues that relate to the psychological state students at the elementary level in high school. We have examined the basic construction principles of physical training’s lessons to improve stress resistance of the students. The main factors that determine problems of development in youth have been consideredВ статье рассматриваются вопросы, касающиеся психологического состояния студенток на начальном этапе обучения в вузе. Намечены основные принципы построения занятий физической культуры для повышения стрессоустойчивости студенток. Рассмотрены основные факторы, определяющие проблемы развития в юношеском возраст

Implementation of random numbers in academic performance assessment

В статье описывается методика создания уникальных индивидуальных экзаменационных заданий для контроля знаний, полученных студентами в течение курса, а также опыт их применения.The article describes a method that allows generation of unique individual examination tasks to be used to assess students' academic performance during the course, and reports some implementation experience

Problems of Visualization of Scientific Knowledge in the Economy

С развитием информационных технологий возникли новые инструменты и методы визуализации информации, вместе с тем появился ряд новых проблем. Проблемы визуализации можно разделить на два вида: проблемы представления визуализации научного знания и проблемы чтения объектов визуализации научного знания. К первому типу относятся проблемы отличий в опыте автора и читателя визуального объекта, отсу тствия у автора необходимых компетенций, ограниченности воображения читателя при визуализации. К проблемам второго типа относятся проблемы «истинности/ложности», разного прочтения, чувственного и рационального познания, «субъективных и объективных моделей», точной вербальной интерпретации, проверки восприятия.With the development of information technology, new tools and methods for visualizing information have emerged, along with a number of new problems. The problems of visualization can be two types: problems of representing visualization of scientific knowledge and problems of reading objects of visualization of scientific knowledge. The first type of problems includes problems of differences in the experience of the author and the reader of the visual object, problems of the lack of the necessary competencies for the author, problems of the limited imagination of the reader during visualization. The problems of the second type: problems of “truth/falsity”, problems of different reading, problems of sensory and rational cognition, problems of “subjective and objective models”, problems of accurate verbal interpretation, problems of checking perception

Hydrodechlorination of 4-Chlorophenol on Pd-Fe Catalysts on Mesoporous ZrO2SiO2 Support

A mesoporous support based on silica and zirconia (ZS) was used to prepare monometallic 1 wt% Pd/ZS, 10 wt% Fe/ZS, and bimetallic FePd/ZS catalysts. The catalysts were characterized by TPR-H2, XRD, SEM-EDS, TEM, AAS, and DRIFT spectroscopy of adsorbed CO after H2 reduction in situ and tested in hydrodechlorination of environmental pollutant 4-chlorophelol in aqueous solution at 30 °C. The bimetallic catalyst demonstrated an excellent activity, selectivity to phenol and stability in 10 consecutive runs. FePd/ZS has exceptional reducibility due to the high dispersion of palladium and strong interaction between FeOx and palladium, confirmed by TPR-H2, DRIFT spectroscopy, XRD, and TEM. Its reduction occurs during short-time treatment with hydrogen in an aqueous solution at RT. The Pd/ZS was more resistant to reduction but can be activated by aqueous phenol solution and H2. The study by DRIFT spectroscopy of CO adsorbed on Pd/ZS reduced in harsh (H2, 330 °C), medium (H2, 200 °C) and mild conditions (H2 + aqueous solution of phenol) helped to identify the reasons of the reducing action of phenol solution. It was found that phenol provided fast transformation of Pd+ to Pd0. Pd/ZS also can serve as an active and stable catalyst for 4-PhCl transformation to phenol after proper reduction

Evolution of the Reagent for Iodination and Iodonitration. Optimization of the Synthesis Conditions in the Framework of Green Chemistry

Показана эволюция реагента Тронова-Новикова, проанализированы результаты работы нашей группы под руководством профессора М. С. Юсубова за последние двадцать лет в области йодирования и йоднитрования. Показаны новые возможности твердофазного реагента на основе йода (йодида калия) и (или) нитратов. Изучены химические свойства твердофазных реагентов и оптимизированы условия проведения реакций, которые позволяют проводить целенаправленный синтез продуктов моно- или дийодирования, йоднитрования, нитрования и гетероциклизации. Показано, что при йодировании активированных и умеренно активированных ароматических субстратов и фенилацетилена в условиях «solvent-free » с более высокими выходами получены продукты, аналогичные продуктам в синтезе с использованием растворителя. Предложены возможные окислительно-восстановительные схемы образования промежуточных частиц дийодосеребра (I) нитрата и нитрилйодида в реакциях без растворителя. Полученные теоретические и экспериментальные данные подтверждают возможность распада нитрилйодида по гомо- и гетеролитическому пути в зависимости от природы субстрата не только в синтезе с участием растворителя, но и в условиях «solvent-free »The evolution of the Tronov-Novikov reagent is shown. Scientific investigations of our research group under the leading of professor M. S. Usubov in the field of iodination and iodonitration have been analyzed. New possibilities of a solid-phase reagent based on iodine (potassium iodide) and (or) nitrates are represented. We have studied chemical properties of the solid-phase reagents and optimized conditions of reactions, which allow prediction the synthesis of products of mono- or diiodination, iodonitration, nitration, and heterocyclization. It has been found that iodination of activated and mild activated aromatic substrates and phenylacetylene under solvent-free conditions results with products similar to those obtained in the presence of solvent. However, the solvent-free procedure offers significant advantages such as higher yields, short reaction times with mild reaction conditions. Possible redox schemes were proposed for the formation of potential intermediate particles diiodosilver(I) nitrate and nitrile iodide in solvent-free reactions. Obtained theoretical and experimental data confirm the possibility of the homo- and heterolytic pathways decomposition of nitrile iodide, depending on the nature of the substrate, in the synthesis with a solvent, as well as under “solvent-free” condition