POROUS METAL-ORGANIC FRAMEWORKS: FROM SYNTHESIS TO FUNCTIONAL PROPERTIES

Lying on the crossing of fundamental inorganic/organic chemistry and development of novel materials, metal-organic frameworks (MOFs) have become one of the most attractive research fields during the past two decades. MOFs can be self-assembled from a large number of metal ions/clusters with organic linkers and can be regarded as multifunctional materials due to a wide range of important properties. MOFs often combine properties caused by specific framework architecture, e.g. permanent porosity, selective gas sorption and separation, and chemical stability, with those ones related to the properties of inorganic building blocks, e.g. luminescence and magnetism. Here we describe our recent results on synthesis, structural characterization and investigation of multifunctional materials based on porous coordination polymers.This work was supported by the Russian Foundation for Basic Research (Grant No. 18-29-04001) and the Russian Science Foundation (Grant No. 19-73-20087)

Peculiarities of syntropic functional disorders of the digestive system against the ground of connective tissue dysplasia

A considerable occurrence of functional gastrointestinal disorders (FGID) in childhood, their frequent combination between themselves, the risk of transformation into organic pathology together with high collagen content in the digestive organs require investigation of pathophysiological relations of the pathology with collagen dysfunction. Objective of the study is to investigate the role of collagen disorders in FGID pathophysiology and assess their effect on clinical development of irritable bowel syndrome. 63 children suffering from FGID have been examined. Irritable bowel syndrome was diagnosed as a leading functional disorder of all the children examined. Syntropic functional biliary disorders were found in (38,46±6,13) % patients. By the results of molecular-genetic examination genetic polymorphism of COL3A1 rs1800255 with prevailing the genotype G/А – 47,62 % (95 % CІ 35,04 – 60,2) was determined, that was most reliably found (р = 0,008) in children with syntropic functional biliary disorders and was associated with a wide range of comorbid pathology (р = 0,002) and pronounced dysplastic signs (р = 0,034)

Understanding hysteresis in carbon dioxide sorption in porous metal-organic frameworks

Two new isostructural microporous coordination frameworks [Mn3(Hpdc)2­(pdc)2] (1) and [Mg3(Hpdc)2­(pdc)2] (2) (pdc2– = pyridine-2,4-dicarboxylate) showing primitive cubic (pcu) topology have been prepared and characterized. The pore aperture of the channels is too narrow for the efficient adsorption of N2; however, both compounds demonstrate substantially higher uptake of CO2 (119.9 mL·g–1 for 1 and 102.5 mL·g–1 for 2 at 195 K, 1 bar). Despite of their structural similarities, 2 shows a typical reversible type I isotherm for adsorption/desorption of CO2, while 1 features a two-step adsorption process with a very broad hysteresis between the adsorption and desorption curves. This behavior can be explained by a combination of density functional theory calculations, sorption, and X-ray diffraction analysis and gives insights into the further development of new sorbents showing adsorption/desorption hysteresis

Supramolecular assemblies of triblock copolymers with hexanuclear molybdenum clusters for sensing antibiotics in aqueous solutions via energy transfer

The work introduces the supramolecular assembly of triblock copolymers, namely (PEO)13(PPO)30(PEO)13 (L64), (PPO) 14(PEO)24(PPO)14 (17R4), (PPO) 8(PEO)22(PPO)8 (10R5) and (PEO) 21(PPO)67(PEO)21 (P123) with novel cluster complexes [K(diglyme)(CH3CN)]2[Mo6I 14] (1) and [K2(diglyme)(CH3CN) 5][Mo6I14] (2) as a route to increase their water solubility. Dynamic light scattering and photophysical measurements reveal the decisive influence of the arrangement of PEO and PPO blocks and of their length on both colloidal and photophysical properties of these solutions. ES-MS data reveal [Mo6I14]2- clusters as the predominant form in aqueous solutions of L64 and P123. The steady state and time resolved luminescence data indicate concentration dependent sensitizing of the Mo-centered luminescence through the energy transfer from difloxacin to [Mo 6I14]2- mediated by the ion-pairing. The impact of both arrangement and length of PEO and PPO blocks in the luminescent response of [Mo6I14]2- to difloxacin is discussed. The aqueous solutions of L64 at pH 4 provide the optimal conditions for the sensing of difloxacin through the cluster luminescence. This journal is © the Partner Organisations 2014

Polymeric hybrid iodoplumbates and iodobismuthates containing mono- and bisalkylated derivatives of 1,2-bis(4-pyridyl)ethylene: Structural and optical features

© 2017 Elsevier B.V.Reactions of PbI2 with N-alkylated derivatives of 1,2-bis(4-pyridyl)ethylene (bpen) MeBpenI and Me2BpenI2 result in 1D-polymeric complexes [{Pb(MeBpen)I3}] (1) and (Me2bpen)[{PbI3}]2 (2). For both compounds, band gap values were determinated experimentally; 1 demonstrates weak red luminescence. Binuclear hybrid iodobismuthate [Bi2(MeBpen)2I8] (3) was obtained by the similar scheme using BiI3 instead of PbI2

ПРОЦЕСС СЛУЖЕБНОГО ТОРМОЖЕНИЯ АВТОМОБИЛЯ

Service braking of a motor car supposes that tire scrubbing will be minimized or zero limited. But this process causes some material losses for technics that some prefer not to speak about. The mathematical model elaborated by the authors, numerical experiment and full-scale testing are the basis for wording of instructions for drivers how to brake on different types of pavement and road surfaces. The values determined within calculated model might reduce wear and tear of tires, braking disks, other material damages.Служебное торможение автомобиля предполагает, как известно, сведение до минимума или нуля проскальзывания колес на дороге. Однако при этом процесс влечет для техники определенные материальные потери, о которых чаще всего предпочитают не говорить. Используемая авторами статьи математическая модель, а также численный эксперимент и натурные испытания дают основания для разработки рекомендаций водителям по грамотному торможению на разных типах дорожного покрытия. Заданные расчетной моделью значения призваны снизить износ шин, тормозных дисков и другие материальные потери.

Полиядерные аквакомплексы галлия (III) и индия (III) – супрамолекулярные аддукты с органическим макроциклическим кавитандом кукурбит[6]урилом

Polynuclear gallium and indium aquacomplexes were isolated as supramolecular compounds. Aquacomplexes and cucurbit[6]uril (СВ[6], C36H36N24O12) molecules are linked to each other through a system of hydrogen bonds between carbonyl groups of СВ[6] and aqua- or/and hydroxoligands of polycationПолиядерные аквакомплексы галлия и индия выделены в виде супрамолекулярных аддуктов с кукурбит[6]урилом (СВ[6], C36H36N24O12), образованных за счет системы водородных связей между атомами кислорода карбонильных групп порталов СВ[6] и аквалигандами поликатионов