A5078185639- Crystallization and Solubility Studies
- Crystallography and molecular interactions
- Supramolecular Chemistry and Complexes
- Analytical Chemistry and Chromatography
- Drug Solubulity and Delivery Systems
- Supramolecular Self-Assembly in Materials
- Molecular Sensors and Ion Detection
- Polydiacetylene-based materials and applications
- X-ray Diffraction in Crystallography
- Porphyrin and Phthalocyanine Chemistry
- Chemical Synthesis and Analysis
- Luminescence and Fluorescent Materials
- Chemical Thermodynamics and Molecular Structure
- Protein purification and stability
- Lipid Membrane Structure and Behavior
- Phase Equilibria and Thermodynamics
- Surfactants and Colloidal Systems
- Analytical Chemistry and Sensors
- Protein Interaction Studies and Fluorescence Analysis
- Innovative Microfluidic and Catalytic Techniques Innovation
- Mass Spectrometry Techniques and Applications
- Conducting polymers and applications
- Biochemical effects in animals
- Lanthanide and Transition Metal Complexes
- Molecular spectroscopy and chirality
Kazan Federal University
2015-2024
Virginia Commonwealth University
2008
The interest in functional supramolecular systems for the design of innovative materials and technologies, able to fundamentally change world, is growing at a high pace. huge array publications that appeared recent years global literature calls systematization structural trends inherent formation these revealed different molecular platforms practically useful properties they exhibit. attention concentrated on topics related are actively explored institutes universities Russia last 10–15...
Polymorphism of phenylbutazone is one the most studied but also elusive problems being complicated by an easy oxidation this drug in solutions and melt resulting variable...
The parameters of stability, guest binding reversibility, and Gibbs energy inclusion were determined for clathrates adamantylcalix[4]arene (1). These data provide a new insight into the structure-property relationships in vapor sensor applications clathrate-forming hosts. A thin layer 1, used quartz microbalance (QCM) sensor, demonstrates selectivity organic vapors, which depends on regeneration technique after binding. Complete 1 surface was reached through exchange bound with ethanol...
Thermal treatment of oligopeptides is one the methods for synthesis organic nanostructures. However, heating may lead not only to self-assembly initial molecules, but also chemical reactions resulting in formation new unexpected nanostructures or change properties existing ones. In present work, reaction cyclization dipeptide l-leucyl-l-leucine solid state under was studied. The morphology thin film and after visualized using atomic force microscopy. This method used demonstration...
The structure−affinity relationships were studied for the guest inclusion parameters of solid tert-butylthiacalix[4]arene (1) and tert-butylcalix[4]arene (2). stoichiometry free energy calculated by sorption isotherms obtained vapor−solid host systems static method headspace gas chromatographic analysis at 298 K. have an threshold thermodynamic activity corresponding to phase transition between initial compound. Unlike tert-butylcalix[4]arene, its thia analogue having a larger molecular bowl...
New properties, earlier unknown for calixarenes, were found tert-butylthiacalix[4]arene (1) clathrate with 1,2-dichloroethane (DCE). Guest exchange in 1·1.90DCE vapors of some organic compounds gives clathrates, which are more thermostable at 34-59 °C than those prepared by direct saturation guest-free 1 pure guests. Besides, guest may produce clathrates that cannot be formed binary host-guest systems. Some compounds, like water, toluene, and trichloroethylene, expel DCE from its but not...
Molecular recognition of vaporous guests by the solid hosts 2,2′-bis(9-hydroxyfluoren-9-yl)biphenyl (1) and tert-butylcalix[4]arene (2) was studied. For this purpose vapour sorption isotherms 15 organic compounds with various molecular size group composition 1 2 were determined static gas chromatographic headspace analysis. Most obtained show a definite inclusion threshold at specific guest activity saturation part corresponding to formation stoichiometric supramolecular compounds. The...
The present work introduces the easy modification of water-in-oil microemulsion procedure aimed at doping Tb(III) complexes within core or shell zones silica nanoparticles (SNs), which are designated as "core-shell", "shell", and "core". dye molecules, chelating ligands, copper ions were applied quenchers Tb(III)-centered luminescence through dynamic or/and static mechanisms. binding silica/water interface results in quenching SNs, which, turn, is greatly dependent on synthetic procedure....
An effective preparation procedure is offered for β-cyclodextrin (bCD) clathrates with volatile guests of moderate hydrophilicity, which otherwise require a finely tuned optimization the bCD/water/guest ratio. The proposed includes guest exchange in water-free bCD matrix. As result, more stable higher inclusion capacity can be prepared than by direct saturation dried or hydrated bCD. To find an optimal method, structure-property relationships were studied four different ways clathrate...
Water and <italic>cyclo</italic>(leucyl–leucyl) organogels: “Water helps <italic>cyclo</italic>(Leu–Leu) to form organogels. <italic>Cyclo</italic>(Leu–Leu) purify water”.
The effect of macrocycle size on the structure-property relationships was studied for inclusion compounds tert-butylcalix[n]arenes (n=4,5) with volatile organic guests having various molecular and group composition. Vapor-sorption isotherms, guest-inclusion stoichiometry Gibbs energy, thermostability parameters decomposition enthalpies were determined host-guest (clathrates) obtained using saturation solid calixarene powder guest vapor. increase host in pair changes observed relationship...
The ability of highly ordered tripeptide structures to keep or change their morphology in contact with organic vapors was studied. A thin film l ‐leucyl‐ ‐leucine (LLL) prepared having microcrystals and nanocrystals on its surface, which are stable upon vacuum drying but become objects selective after a solvents. Fine separate LLL crystals agglomerates submicron larger dimensions were observed by atomic force microscopy scanning electron microscopy. After saturation guest vapors, these can...
Abstract Glassy carbon electrode (GCE) was modified by new polymeric materials obtained from oligolactides cross‐linking with tetracarboxylated thiacalix[4]arene in cone, partial cone and 1,3‐alternate configurations then silver deposited potential cycling the pores of polymer film. The showed highly sensitive selective signal toward tryptophan which irreversibly oxidized on coating due to Ag + assisted accumulation surface layer. role macrocycle configuration conditions for nanodendrites...
Thermal treatment of short‐chain oligopeptides is able to initiate the process their self‐assembly with formation organic nanostructures unique properties. On other hand, heating can lead a chemical reaction new substances specific properties and ability form structures different morphology. Therefore, in order have desired process, researcher needs find its temperature range. In present work, cyclization L ‐isoleucyl‐ ‐alanine dipeptide solid state upon was studied. Kinetic parameters this...
A metastable material with tunable free volume of molecular size, vapor sorption properties a porous sorbent and variable thermal stability was prepared from tert-butylcalix[6]arene.
The non-zeolitic behavior of l-leucyl-l-leucine and its self-organization in solid state from solutions with the formation different nanostructures are reported. This dipeptide forms porous crystals, but does not exhibit molecular sieve effects typical classical zeolites biozeolites. specific sorption properties result a change crystal packing channel-type to layered-type, when binding strong proton acceptors or donors size greater than 18-20 cm3 mol-1. high capacity toward dichloromethane...
The studied calixarene has a unique ability to record the history of its previous treatment in three essentially different ways. Two corresponding metastable states may be used for molecular recognition.
Solid-state guest exchange is used as an efficient method to prepare very metastable polymorphs of indomethacin, including the polymorph observed earlier only in a mixture with polymeric solvent and new crystalline form this drug negligibly small amount included (guest). The preparation procedure gives less stable inclusion compounds which require milder desolvation treatment than formed binary host–guest systems, so forms low first melting point can be prepared. For characterization...
The strong effect of the amino acid sequence in L-alanyl-L-valine and L-valyl-L-alanine on their sorption properties toward organic compounds water, thermal stability inclusion these dipeptides have been found. Generally, has a greater capacity for studied compounds, but clathrates is higher. Unusual selectivity vapors few chloroalkanes was observed. correlation between change surface morphology thin film stoichiometry with This discovery may be used to predict influence films short-chain...