ИОНХ РАН. Химия в России и за рубежом. Страница 3

Epoxy-Amine Systems with Reactive Guanidine Derivatives

Polymer Science, Series B - The modification of epoxy-amine systems with reactive monomeric derivatives based on guanidine has been attempted in order to create novel polymer coatings suppressing...

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Topic:Synthetic Tunability in Open Framework Materials for Energy and Environmental Applications Speaker: Prof. Dinesh Shetty, Assistant Professor of Chemistry, College of Arts and Science, Khalifa University

ИОХ РАН

Учеными ИОХ РАН получены перспективные соединения с противоопухолевой активностью Гормонозависимый рак молочной железы и предстательной железы являются наиболее распространенными видами рака у женщин и мужчин, соответственно. Несмотря на последние достижения в области раннего выявления и лечения, эти виды рака по-прежнему занимают второе место среди причин смертности от рака у женщин и мужчин во всем мире. Именно поэтому существует огромная потребность в разработке новых эффективных и селективных противоопухолевых препаратов для лечения рака молочной железы и простаты. Ученые Лаборатории химии стероидных соединений ИОХ РАН активно занимаются синтезом новых производных гетероциклических производных стероидов и исследованием их антипролиферативной активности с целью выявления новых высокоселективных противоопухолевых агентов. В одной из своих недавних работ исследователи создали метод синтеза андроста-5,16-диенов, модифицированных различными гетероциклическими фрагментами, путем гетероциклизации стероидных альфа…

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ПРИЕМ ЗАЯВОК Иваново ИВГПУ 5 октября 2023 Иваново ИВГПУ 13 октября Всероссийский молодежный конкурс ЛЕГПРОМНАУКА Организаторы: Российский Союз предпринимателей

Pyridine-, Pyridazine-, Pyrimidine-, and Pyrazine-Derived Carbenes as Ligands for Transition-Metal Complexes: Perspectives from DFT Calculations

A comprehensive theoretical analysis of the electronic structure, reactivity, and ligand properties of various types of carbenes derived from pyridine and diazines (pyridazine, pyrimidine, and pyrazine) was performed. These carbenes are divided into three classes: “normal” N-heterocyclic carbenes (NHCs) bearing one nitrogen atom at the ylidene carbon (1N-NHC), mesoionic carbenes (MIC), and remote-NHCs (r-NHC). These species have a singlet ground state. Carbenes under study bear high-lying lone electron pairs localized on the ylidene carbon atoms making them bases 2–18 pKaH units stronger than the reference imidazol-2-ylidenes. However, such carbenes are thermodynamically and kinetically less stable than conventional imidazol-2-ylidenes. Pyridinium and diazinium carbenes have exceptional ligand properties evaluated using a model (NHC)Rh(CO)2Cl complex: high metal–ligand binding energies and significantly higher electron donation and steric stabilization than those provided by its five-membered ring counterparts.…

An Adaptive Multispectral Mechano-Optical System for Multipurpose Applications

Mechano-optical systems with on-demand adaptability and a broad spectrum from the visible to microwave are critical for complex multiband electromagnetic (EM) applications. Most existing material systems merely have dynamic optical or microwave tunability because their EM wave response is strongly wavelength-dependent. Inspired by cephalopod skin, we develop an adaptive multispectral mechano-optical system based on bilayer acrylic dielectric elastomer (ADE)/silver nanowire (AgNW) films, which reconfigures the surface morphology between wrinkles and cracks via mechanical contraction and stretching. Such morphological evolution regulates the direct transmission/reflection and scattering behavior of visible–infrared light and simultaneously alters the conductive network in a AgNW film to influence its microwave characteristics. The designed system features switching between visible–infrared–microwave transparency and opacity, continuous regulation, wide spectral window (0.38–15.5 μm and 24,200–36,600 μm), excellent…

Losses of Yeast-Fermented Carbon Dioxide during Prolonged Champagne Aging: Yes, the Bottle Size Does Matter!

When it comes to champagne tasting, dissolved CO2 is a key compound responsible for the very much sought-after effervescence in glasses. Nevertheless, the slow decrease of dissolved CO2 during prolonged aging of the most prestigious cuvees raises the issue of how long champagne can age before it becomes unable to form CO2 bubbles during tasting. Measurements of dissolved CO2 concentrations were done on a collection of 13 successive champagne vintages stored in standard 75 cL bottles and 150 cL magnums showing prolonged aging ranging from 25 to 47 years. The vintages elaborated in magnums were found to retain their dissolved CO2 much more efficiently during prolonged aging than the same vintages elaborated in standard bottles. A multivariable exponential decay-type model was proposed for the theoretical time-dependent concentration of dissolved CO2 and the subsequent CO2 pressure in the sealed bottles during champagne aging. The CO2 mass transfer coefficient through the crown caps used to seal champagne bottles…

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Whether in academia or industry, proposals are essential to securing grants, gaining approval for projects and obtaining support for new initiatives. Yet, what makes a good proposal eludes many people. This workshop will help you write proposals that stand-out and gain the attention of the decision makers and/or committee members.

Can the Sublimation Enthalpy Be Obtained Using Atomic Force Microscopy with Heating? A PETN Nanofilm Case

Vaporization is an important aspect of the performance and detection of energetic materials. While the traditional techniques concentrate on bulk property changes during sublimation, atomic force microscopy (AFM) offers the possibility to track particle volume changes under heating. Ideally, this will enable the investigation of chemicals that are challenging to study using conventional vaporization analysis methods, i.e., those having low thermal stability and/or low volatility. However, prior studies have demonstrated that novel structural effects at the nanoscale may interfere with sublimation mass loss. The present work aims to provide a comprehensive investigation of the sublimation of pentaerythritol tetranitrate (PETN) thin films with respect to the measurement parameters, the heating technique, the sample composition, and the type of the substrate. We observed the low-temperature recrystallization of thin-film islands during heating together with the sublimation process; this was demonstrated by the unexpected…

ИОХ РАН

Исследователями ИОХ РАН разработан новый минералоподобный катализатор на основе филлосиликата никеля для селективного гидрирования непредельных соединений В настоящее время материалы с филлосиликатной структурой вызывают большой интерес в гетерогенном катализе благодаря их развитой удельной поверхности, высокой дисперсности активного металла, а также наличию сильного контактного взаимодействия между нанесенным переходным металлом и носителем. Ученые Лаборатории разработки и исследования полифункциональных катализаторов ИОХ РАН совместно с исследователями из МГУ им. М.В. Ломоносова разработали новый катализатор на основе филлосиликата никеля для селективного гидрирования тройной связи углерод-углерод в ряде непредельных соединений. Никельсодержащий катализатор, обладающий микро-мезопористой структурой, был впервые синтезирован внутри пор коммерчески доступного носителя SiO2 путем осаждения термическим гидролизом мочевины. Разработанный катализатор обладает высокой селективностью (более 90%) по отношению к двойной…