A5012451006- Supramolecular Chemistry and Complexes
- X-ray Diffraction in Crystallography
- Crystallography and molecular interactions
- Crystallization and Solubility Studies
- Molecular Sensors and Ion Detection
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Mass Spectrometry Techniques and Applications
- Metal-Organic Frameworks: Synthesis and Applications
- Synthesis and Reactivity of Sulfur-Containing Compounds
- Advanced NMR Techniques and Applications
- Supramolecular Self-Assembly in Materials
- Synthesis of heterocyclic compounds
- Photochromic and Fluorescence Chemistry
- Organic Chemistry Synthesis Methods
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Silicone and Siloxane Chemistry
- Fluorine in Organic Chemistry
- Photoreceptor and optogenetics research
- Water Quality Monitoring and Analysis
- Hydrogels: synthesis, properties, applications
- Synthesis and biological activity
- Proteoglycans and glycosaminoglycans research
Tomas Bata University in Zlín
2009-2024
Abstract Bisimidazolium salts with one central biphenyl binding site and two terminal adamantyl sites form water‐soluble binary or ternary aggregates cucurbit[7]uril (CB7) β‐cyclodextrin (β‐CD) rotaxane pseudorotaxane architectures. The observed arrangements result from cooperation of the supramolecular stopper strength steric barriers against free slippage CB7 β‐CD host molecules over bisimidazolium guest axle.
Multitopic supramolecular guests with finely tuned affinities toward widely explored cucurbit[n]urils (CBs) and cyclodextrins (CDs) have been recently designed tested as functional components of advanced systems. We employed various spacers between the adamantane cage a cationic moiety tool for tuning binding strength CB7 to prepare set model KCB7 Kβ-CD values (0.6–5.0) × 1010 M–1 (0.6–2.6) 106 M–1, respectively. These accessible adamantylphenyl-based motifs open way an outstanding affinity...
A binding motif based on 1,3-disubstituted adamantane binds cucurbit[8]uril and cucurbit[7]uril with respective values of p<italic>K</italic>= 12 11 to allow formation quaternary assemblies inverse arrangements.
Cubane, an intriguing chemical curiosity first studied in the early 1960s, has become a valuable structural motif and recently been involved structures of great number prospective compounds. The dicationic supramolecular guest 5 is prepared derived from 1,4-disubstituted cubane moiety, its binding behavior toward cucurbit[n]urils (CBn) cyclodextrins (CD) studied. bisimidazolium salt forms 1:1 inclusion complexes with CB7, CB8, β-CD respective association constants (6.7 ± 0.5) × 1011 M–1,...
Novel binding motifs suitable for the construction of multitopic guest-based molecular devices (e.g., switches, sensors, data storage, and catalysts) are needed in supramolecular chemistry. No rigid, aliphatic motif that allows axial disubstitution has been described cucurbit[6]uril (CB6) so far. We prepared three model guests combining spiro[3.3]heptane bicyclo[1.1.1]pentane centerpieces with imidazolium ammonium termini. their properties toward CB6/7 α-/β-CD using NMR, titration...
A new hyaluronan derivative modified with β-cyclodextrin units (CD-HA) was prepared via the click reaction between propargylated and monoazido-cyclodextrin (CD) to achieve a degree of substitution 4%. The characterized by 1H-nuclear magnetic resonance spectroscopy (NMR) size exclusion chromatography. Subsequent 1H-NMR isothermal calorimetric titration experiments revealed that CD on CD-HA can form virtual 1:1, 1:2, 1:3 complexes one-, two-, three-site adamantane-based guests, respectively....
Abstract Redox–active components are highly valuable in the construction of molecular devices. We combined two p ‐phenylenediamines ( ‐PDA) with a biphenyl (BiPhe) unit to prepare supramolecular guest 4 consisting three binding sites for cucurbit[7/8]uril (CB n ) and/or cyclodextrins (CD). Supramolecular properties were investigated using NMR, UV‐vis, mass spectrometry and isothermal titration calorimetry. Our analysis revealed that forms higher–order host–guest complexes, wherein CD...
Repulsions between portals of cucurbit[ n ]urils are sufficiently strong to unlock the rotaxane structure.
Rationale Bisimidazolium salts (BIMs) represent an interesting family of ditopic ligands that are used in the construction supramolecular systems with hosts based on cyclodextrins or cucurbit[n]urils. Understanding fragmentation mechanism individual BIMs and how this changes after complexation cucurbit[n]urils can bring new insight into intrinsic host‐guest relationship, thereby allowing utilization mass spectrometry to describe binding behavior. Methods Selectively 2 H‐labeled...
Adamantane-based imidazolium salts with flexible linkers between the adamantane cage and core were prepared. Their supramolecular behaviour towards natural cyclodextrins α-CD, β-CD γ-CD cucurbit[<italic>n</italic>]urils (<italic>n</italic> = 7, 8) was studied.
Stilbene derivatives are well-recognised substructures of molecular switches based on photochemically and/or thermally induced (E)/(Z) isomerisation. We combined a stilbene motif with two benzimidazolium arms to prepare new sorts supramolecular building blocks and examined their binding properties towards cucurbit[n]urils (n=7, 8) cyclodextrins (β-CD, γ-CD) in water. Based the 1 H NMR data dynamics simulations, we found that distinct complexes different stoichiometry, i. e., guest@β-CD...
Three alternative procedures were worked out for disposal of waste liquor from production 2,5-dichlorodisulfanilic acid [CAS No. 88-50-6]. This is a hazardous liquid which, if discharged into wastewater treatment plant without any treatment, inhibits processes biological treatment. The first utilizes stabilization/solidification technology by using fluidized-bed combustion ash. second consists in treating the flow-through columnpacked with active carbon black as an adsorbent and discharging...
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