3,989 research outputs found
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 (38,46Β±6,13) % patients. By the results of molecular-genetic examination genetic polymorphism of COL3A1 rs1800255 with prevailing the genotype G/Π β 47,62 % (95 % CΠ 35,04 β 60,2) was determined, that was most reliably found (Ρ = 0,008) in children with syntropic functional biliary disorders and was associated with a wide range of comorbid pathology (Ρ = 0,002) and pronounced dysplastic signs (Ρ = 0,034)
Understanding hysteresis in carbon dioxide sorption in porous metal-organic frameworks
Two
new isostructural microporous coordination frameworks [Mn3(Hpdc)2Β(pdc)2] (1) and [Mg3(Hpdc)2Β(pdc)2] (2) (pdc2β = 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 mLΒ·gβ1 for 1 and 102.5 mLΒ·gβ1 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 Β© 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
Β© 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
ΠΠ ΠΠ¦ΠΠ‘Π‘ Π‘ΠΠ£ΠΠΠΠΠΠΠ Π’ΠΠ ΠΠΠΠΠΠΠ― ΠΠΠ’ΠΠΠΠΠΠΠ―
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.Π‘Π»ΡΠΆΠ΅Π±Π½ΠΎΠ΅ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΠ΅ Π°Π²ΡΠΎΠΌΠΎΠ±ΠΈΠ»Ρ ΠΏΡΠ΅Π΄ΠΏΠΎΠ»Π°Π³Π°Π΅Ρ, ΠΊΠ°ΠΊ ΠΈΠ·Π²Π΅ΡΡΠ½ΠΎ, ΡΠ²Π΅Π΄Π΅Π½ΠΈΠ΅ Π΄ΠΎ ΠΌΠΈΠ½ΠΈΠΌΡΠΌΠ° ΠΈΠ»ΠΈ Π½ΡΠ»Ρ ΠΏΡΠΎΡΠΊΠ°Π»ΡΠ·ΡΠ²Π°Π½ΠΈΡ ΠΊΠΎΠ»Π΅Ρ Π½Π° Π΄ΠΎΡΠΎΠ³Π΅. ΠΠ΄Π½Π°ΠΊΠΎ ΠΏΡΠΈ ΡΡΠΎΠΌ ΠΏΡΠΎΡΠ΅ΡΡ Π²Π»Π΅ΡΠ΅Ρ Π΄Π»Ρ ΡΠ΅Ρ
Π½ΠΈΠΊΠΈ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½Π½ΡΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΠ΅ ΠΏΠΎΡΠ΅ΡΠΈ, ΠΎ ΠΊΠΎΡΠΎΡΡΡ
ΡΠ°ΡΠ΅ Π²ΡΠ΅Π³ΠΎ ΠΏΡΠ΅Π΄ΠΏΠΎΡΠΈΡΠ°ΡΡ Π½Π΅ Π³ΠΎΠ²ΠΎΡΠΈΡΡ. ΠΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΠΌΠ°Ρ Π°Π²ΡΠΎΡΠ°ΠΌΠΈ ΡΡΠ°ΡΡΠΈ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠ°Ρ ΠΌΠΎΠ΄Π΅Π»Ρ, Π° ΡΠ°ΠΊΠΆΠ΅ ΡΠΈΡΠ»Π΅Π½Π½ΡΠΉ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½Ρ ΠΈ Π½Π°ΡΡΡΠ½ΡΠ΅ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡ Π΄Π°ΡΡ ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΡ Π΄Π»Ρ ΡΠ°Π·ΡΠ°Π±ΠΎΡΠΊΠΈ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΉ Π²ΠΎΠ΄ΠΈΡΠ΅Π»ΡΠΌ ΠΏΠΎ Π³ΡΠ°ΠΌΠΎΡΠ½ΠΎΠΌΡ ΡΠΎΡΠΌΠΎΠΆΠ΅Π½ΠΈΡ Π½Π° ΡΠ°Π·Π½ΡΡ
ΡΠΈΠΏΠ°Ρ
Π΄ΠΎΡΠΎΠΆΠ½ΠΎΠ³ΠΎ ΠΏΠΎΠΊΡΡΡΠΈΡ. ΠΠ°Π΄Π°Π½Π½ΡΠ΅ ΡΠ°ΡΡΠ΅ΡΠ½ΠΎΠΉ ΠΌΠΎΠ΄Π΅Π»ΡΡ Π·Π½Π°ΡΠ΅Π½ΠΈΡ ΠΏΡΠΈΠ·Π²Π°Π½Ρ ΡΠ½ΠΈΠ·ΠΈΡΡ ΠΈΠ·Π½ΠΎΡ ΡΠΈΠ½, ΡΠΎΡΠΌΠΎΠ·Π½ΡΡ
Π΄ΠΈΡΠΊΠΎΠ² ΠΈ Π΄ΡΡΠ³ΠΈΠ΅ ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΠ΅ ΠΏΠΎΡΠ΅ΡΠΈ.
ΠΠΎΠ»ΠΈΡΠ΄Π΅ΡΠ½ΡΠ΅ Π°ΠΊΠ²Π°ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡ Π³Π°Π»Π»ΠΈΡ (III) ΠΈ ΠΈΠ½Π΄ΠΈΡ (III) β ΡΡΠΏΡΠ°ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΡΠ΅ Π°Π΄Π΄ΡΠΊΡΡ Ρ ΠΎΡΠ³Π°Π½ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΌΠ°ΠΊΡΠΎΡΠΈΠΊΠ»ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΊΠ°Π²ΠΈΡΠ°Π½Π΄ΠΎΠΌ ΠΊΡΠΊΡΡΠ±ΠΈΡ[6]ΡΡΠΈΠ»ΠΎΠΌ
Polynuclear gallium and indium aquacomplexes were isolated as supramolecular compounds. Aquacomplexes and cucurbit[6]uril (Π‘Π[6], C36H36N24O12) molecules are linked to each other through a system of hydrogen bonds between carbonyl groups of Π‘Π[6] and aqua- or/and hydroxoligands of polycationΠΠΎΠ»ΠΈΡΠ΄Π΅ΡΠ½ΡΠ΅ Π°ΠΊΠ²Π°ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡ Π³Π°Π»Π»ΠΈΡ ΠΈ ΠΈΠ½Π΄ΠΈΡ Π²ΡΠ΄Π΅Π»Π΅Π½Ρ Π² Π²ΠΈΠ΄Π΅ ΡΡΠΏΡΠ°ΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½ΡΡ
Π°Π΄Π΄ΡΠΊΡΠΎΠ² Ρ ΠΊΡΠΊΡΡΠ±ΠΈΡ[6]ΡΡΠΈΠ»ΠΎΠΌ (Π‘Π[6], C36H36N24O12), ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½Π½ΡΡ
Π·Π° ΡΡΠ΅Ρ ΡΠΈΡΡΠ΅ΠΌΡ Π²ΠΎΠ΄ΠΎΡΠΎΠ΄Π½ΡΡ
ΡΠ²ΡΠ·Π΅ΠΉ ΠΌΠ΅ΠΆΠ΄Ρ Π°ΡΠΎΠΌΠ°ΠΌΠΈ ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° ΠΊΠ°ΡΠ±ΠΎΠ½ΠΈΠ»ΡΠ½ΡΡ
Π³ΡΡΠΏΠΏ ΠΏΠΎΡΡΠ°Π»ΠΎΠ² Π‘Π[6] ΠΈ Π°ΠΊΠ²Π°Π»ΠΈΠ³Π°Π½Π΄Π°ΠΌΠΈ ΠΏΠΎΠ»ΠΈΠΊΠ°ΡΠΈΠΎΠ½ΠΎΠ²
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