Results 201 to 210 of about 6,769 (240)

Disilver(I) Macrocycles:  Variation of Cavity Size with Anion Binding

Inorganic Chemistry, 2005
Reaction of the N-methylated bis(amidopyridine) ligand, LL = C6H4(1,3-CONMe-4-C5H4N)2, with the silver salts AgNO3, AgO2CCF3, AgO3SCF3, AgBF4, and AgPF6 gave the corresponding cationic disilver(I) macrocycles [Ag2(micro-LL)2]X2, 2a-e. The transannular silver...silver distance in the macrocycles varies greatly from 2.99 to 7.03 A, and these differences ...
Nancy L S, Yue, Michael C, Jennings, Richard J, Puddephatt   +2 more
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Size Complementarity of Macrocyclic Cavities and Stoppers in Amide-Rotaxanes

Helvetica Chimica Acta, 1999
New [2]rotaxanes were prepared by the threading and the slipping procedure, the latter having the advantage of not needing templating interactions. As a consequence, the first [2]rotaxane consisting of a tetraamide macrocycle and a pure hydrocarbon thread was synthesized (see 12a in Scheme 2).
Christiane Heim, Ansgar Affeld, Martin Nieger, Fritz Vögtle   +3 more
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Alkylammonium Cation Complexation into the Narrow Cavity of Dihomooxacalix[4]arene Macrocycle

The Journal of Organic Chemistry, 2012
How big should a calixarene macrocycle be for endo-cavity complexation to occur or to allow through-the-annulus threading? To answer these questions, a complete study on the complexation of primary and secondary (di)alkylammonium cations by 18-membered p-tert-butyldihomooxacalix[4]arene macroring has been performed in the presence of the "superweak ...
GAETA, CARMINE, TALOTTA, CARMEN, Francesco Farina, Filipa A. Teixeira, Paula M. Marcos, José R. Ascenso, NERI, Placido   +6 more
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Study on Molecular Cavity of Oligoamide Macrocycles by Using Scanning Tunneling Microscopy

ChemPhysChem, 2012
The molecular structures and assembly structures of aromatic oligoamide macrocycles are identified by using scanning tunneling microscopy at liquid/solid interface, which shows persistent shapes, tunable cavity sizes, and binding of water molecules.
Yibing, Wang, Yibao, Li, Yin, Luo, Meng, Xu, Xuemei, Zhang, Yuanyuan, Guo, Guanghong, Wei, Lihua, Yuan, Bing, Gong, Yanlian, Yang, Chen, Wang   +10 more
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ChemInform Abstract: Studies in the Flexibility of Macrocycle Ligands. Calculation of Macrocycle Cavity Size by Force‐field Methods.

Chemischer Informationsdienst, 1986
AbstractDer Co‐Komplex kristallisiert in der RG P212121 mit Z=4 und ist oktaedrisch koordiniert.
M. G. B. DREW, S. HOLLIS, P. C. YATES
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Synthesis and characterization of the novel shape-persistent nanosized cavity macrocycle

Synthetic Metals, 2011
Abstract The Friedel–Crafts reaction was employed to prepare the shape-persistent macrocycle (TPAP)3 with direct cyclization from three monomers of 2-(4′-(Phenyl(4″-methylphenyl)amino) phenyl)-propan-2-ol (TPAP), which contains two reactive groups of the t-hydroxyl and the p-proton on the triphenylamine. Under a very low monomer concentration (ca. 1%)
Qinggang Kong, Haiyan Qian, Hongzhong Bo, Chaozhi Zhang, Kai Liu, Xiangyu Zhang, Jianke Wang, Jun Li, Guizhi Gao   +8 more
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A shape-persistent arylene ethynylene macrocycle with a multiple acetamide modified cavity: synthesis and gelation

Soft Matter, 2021
Strong H-bonds suppress π–π stacking leading to an AIEE gel from a planar conjugated macrocycle.
Yang Ruan, Qian-Hui Li, Lijin Shu, Jun-Hua Wan   +3 more
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Closing the cavity: reactive and light switchable dienone-ether macrocycles

CrystEngComm, 2010
Dienone-ether macrocycles may be reversibly switched from the thermodynamically stable E,E,E,E-isomers, with an open central cavity, to globular, cavity-closed E,E,Z,Z-isomers by the action of sunlight. They are restored to their open forms by gentle heating, but more intense heating may result in an intramolecular reaction, closing the cavity in a ...
Luke T. Higham, Janet L. Scott, Christopher R. Strauss   +2 more
openaire   +1 more source

Synthesis and conformation of macrocyclic porphyrin dimers with potentially spacious cavities

Journal of the Chemical Society, Chemical Communications, 1988
The importance of π–π donor–acceptor interactions is demonstrated in the synthesis and conformation of macrocyclic porphyrin dimers covalently linked by biphenyl or pyromellitimide bridges.
Christopher A. Hunter, M. Nafees Meah, Jeremy K. M. Sanders   +2 more
openaire   +1 more source

Glucopyranoside Recognition by Polypyridine-Macrocyclic Receptors Possessing a Wide Cavity with a Flexible Linkage

The Journal of Organic Chemistry, 1999
New polypyridine-macrocyclic receptors for glucopyranosides were designed and synthesized. The artificial receptors possess a terpyridine skeleton as a hydrogen-bonding site and a flexible polyoxyethylene chain as a bridge for the macrocyclic structure, in which the cavity of the receptors is large enough to incorporate pyranosides.
Masahiko, Inouye, Junya, Chiba, Hiroyuki, Nakazumi   +2 more
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