نتایج جستجو برای: β-Cyclodextrin conjugated imidazolium cation

تعداد نتایج: 265190  

Journal: :Journal of the American Society for Mass Spectrometry 2014
Ana M Fernandes Bernd Schröder Tânia Barata Mara G Freire João A P Coutinho

The interaction of imidazolium-based ionic liquids with α- and β-cyclodextrins was investigated by electrospray ionization mass spectrometry with variable collision induced dissociation energy and quantum chemical gas-phase calculations. The center-of-mass energy at which 50% of a precursor ion decomposes (Ecm,1/2) was determined for the isolated [cyclodextrin + cation](+) or [cyclodextrin + an...

Journal: :Chemical communications 2015
Ping Hu Yong Chen Yu Liu

Switchable DNA condensers based on β-cyclodextrin derivates bearing cationic imidazolium moieties and hydrolysable ester linkages were synthesized, showing base-responsive or enzyme-responsive switchable DNA condensation ability under physiological conditions.

The present study, for the first time, presents a feasible protocol for the preparation of β-cyclodextrin/ imidazolium based dicationic ionic liquid, [βCD/Im](OTs)2, and its application as an efficient and eco-friendly microvessel and host ionic liquid system for the regioselective ring opening of the epoxides in water. No evidence for the formation of diol by-products or side reacti...

The present study, for the first time, presents a feasible protocol for the preparation of β-cyclodextrin/ imidazolium based dicationic ionic liquid, [βCD/Im](OTs)2, and its application as an efficient and eco-friendly microvessel and host ionic liquid system for the regioselective ring opening of the epoxides in water. No evidence for the formation of diol by-products or side reacti...

2011
Sharifah Mohamad Hemavathy Surikumaran Muggundha Raoov Tilagam Marimuthu Kumuthini Chandrasekaram Puvaneswary Subramaniam

This study focuses on the synthesis and characterization of the inclusion complex of β-Cyclodextrin (β-CD) with dicationic ionic liquid, 3,3'-(1,4-Phenylenebis [methylene]) bis(1-methyl-1H-imidazol-3-ium) di(bromide) (PhenmimBr). The inclusion complex was prepared at room temperature utilizing conventional kneading technique. Proton ((1)H) NMR and 2D ((1)H-(1)H) COSY NMR were the primary charac...

Journal: :Dalton transactions 2012
Sébastien Noël Bastien Léger Rudy Herbois Anne Ponchel Sébastien Tilloy Gerhard Wenz Eric Monflier

Rhodium(0) nanoparticles stabilized by a polymer containing carboxylate and β-cyclodextrin moieties have high stability and catalytic activity for aqueous hydrogenation reactions of olefins and aromatic substrates. This catalytic system can be recycled and reused without loss of activity. These high catalytic performances can be attributed to conjugated electrostatic interactions (carboxylate g...

Journal: :The journal of physical chemistry. B 2009
Yifeng He Qingde Chen Chao Xu Jingjing Zhang Xinghai Shen

We report herein the interaction of three ionic liquids, i.e., 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (11), 1-hexyl-2,3-dimethylimidazolium chloride (16), and 1-dodecyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (17), with beta-cyclodextrin (beta-CD). For 11 and 16, the 1:1 inclusion complexes were determined and the association constants were estimated through...

Bifunctional acidic ionic liquids, having both H-imidazolium and -SO3H groups as cation moieties (H-BFAILs) and CF3SO3- as anion, were synthesized in high yields. These H-BFAILs showed significant hydrophilic properties, lower acidity and higher thermal stability relative to common ionic liquids, due to their unique structures. The (propyl or butyl-3-sulfonic) imidazolium trifluoromethane sulfo...

Journal: :Chemical communications 2012
Hongguang Li Mohammad H El-Dakdouki David C Zhu George S Abela Xuefei Huang

Water-soluble, β-cyclodextrin conjugated superparamagnetic nanoparticles have been constructed. These particles showed selective binding to cholesterol crystals, which opens the door for the detection of cholesterol crystal-related diseases such as atherosclerosis by magnetic resonance imaging (MRI).

Journal: :Chemical communications 2011
Marcus Rose Andreas Notzon Maja Heitbaum Georg Nickerl Silvia Paasch Eike Brunner Frank Glorius Stefan Kaskel

A bifunctional imidazolium linker was used for the production of highly crosslinked element organic frameworks by Suzuki-coupling with tetrafunctional boronic acids. The resulting porous materials are good heterogeneous organocatalysts in the N-heterocyclic carbene-catalyzed conjugated umpolung of α,β-unsaturated cinnamaldehyde.

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید