نتایج جستجو برای: crown ether addition

تعداد نتایج: 750363  

Journal: :Organic & biomolecular chemistry 2014
Zhenhui Qi Nora L Traulsen Paula Malo de Molina Christoph Schlaich Michael Gradzielski Christoph A Schalley

A chiral, crown-ether-functionalized bisurea gelator forms supramolecular gels in ionic liquids. The resulting ionogels show a remarkably high thermal stability with gel-sol transition temperatures (T(gs)) reaching more than 100 °C. The mechanical strength of these ionogels is surprisingly high and even comparable to that of cross-linked protein fibres. Furthermore, the ionogels exhibit rapid s...

2002
Charles J. Pedersen

• The discovery of the first crown ether is described. Forty-seven other aromatic and saturated polyethers were synthesized and their properties determined. Many form stable crystalline complexes with alkali and alkaline earth salts. Some saturated crown ethers solubilize potassium hydroxide and permanganate in aromatic hydrocarbons, EThe SC!5 indicates that this paper has been cited in over 1,...

Journal: :Chemical communications 2015
Annike Weissenstein Frank Würthner

Two new perylene bisimide (PBI) derivatives possessing crown ether receptors at the 1,7 bay-positions and solubilizing ionic imide substituents were synthesized and their self-assembly properties in the presence of different metal ions were studied, revealing highly selective barium ion templated self-assembly of 15-crown-5 functionalized PBI into H-type dimer aggregates.

Journal: :Chemical communications 2014
Yanli Tian Xueli Zhang Yuyan Li Timothy M Shoup Xin Teng David R Elmaleh Anna Moore Chongzhao Ran

In this report, we reasoned that non-covalent modification of amyloid beta (Aβ) by crown ethers could inhibit its aggregation. We demonstrated that PiB-C, a conjugate PiB and crown ether, could significantly reduce the aggregation in vitro. Additionally, two-photon imaging showed that PiB-C could efficiently label Aβ plaques and CAAs in AD mice.

Journal: :Chemical communications 2013
Xuzhou Yan Peifa Wei Zhengtao Li Bo Zheng Shengyi Dong Feihe Huang Qizhong Zhou

Driven by orthogonal pillar[5]arene-based and crown ether-based molecular recognitions, a dynamic [1]catenane with pH-responsiveness was constructed via threading-followed-by-complexation.

Journal: :Chemical communications 2012
Xuzhou Yan Peifa Wei Binyuan Xia Feihe Huang Qizhong Zhou

Pseudorotaxanes from self-assembly of two crown ether-based cryptand wheels and a 1,2-bis(pyridinium) ethane derivative axle were prepared.

Journal: :Chemical communications 2005
Feihe Huang Harry W Gibson

A supramolecular poly[3]pseudorotaxane was prepared by self-assembly of a homoditopic cylindrical bis(crown ether) host and a bisparaquat derivative in solution by host-guest complexation.

Journal: :Chemical communications 2006
Jonathan B Coldwell Cara E Felton Lindsay P Harding Ryan Moon Simon J A Pope Craig R Rice

The complex [NdL](III) is based upon a crown ether-appended ditopic cryptate ligand and demonstrates a near-infrared fluorescence response to Ba(II).

Journal: :Dalton transactions 2010
Dianyi Liu Kuanzhen Tang Weisheng Liu Chengyong Su Xuhuan Yan Minyu Tan Yu Tang

A novel luminescent chemosensor for detecting Hg(2+) with high selectivity, based on a pendant benzo crown ether terbium complex, has been designed and prepared.

Journal: :Dalton transactions 2012
K Duerr O Troeppner J Olah J Li A Zahl T Drewello N Jux J N Harvey I Ivanović-Burmazović

The solution behavior of iron(III) and iron(II) complexes of 5(4),10(4),15(4),20(4)-tetra-tert-butyl-5,10,15,20-tetraphenylporphyrin (H(2)tBuTPP) and the reaction with superoxide (KO(2)) in DMSO have been studied in detail. Applying temperature and pressure dependent NMR studies, the thermodynamics of the low-spin/high-spin equilibrium between bis- and mono-DMSO Fe(II) forms have been quantifie...

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