Results 181 to 190 of about 430,530 (226)

Oxatub[4]Arene: A Smart Macrocyclic Receptor With Multiple Interconvertible Cavities

Chemical Science, 2015
We report a smart macrocycle with four interconvertible cavities, which can select the best-fit cavity for a given guest.
Wei Jiang, Ren-Wang Jiang, Zhi-Sheng Pan
exaly   +4 more sources

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Chiral porphyrin dimer with a macrocyclic cavity for intercalation of aromatic guests

Chemical Communications, 2011
Chiral diporphyrin receptor 1, which has a macrocyclic cavity to sandwich aromatic guest molecules via double π-π stacking interactions, enabled the naked-eye detection of an aromatic explosive as well as chiral discrimination in NMR.
Tadashi, Ema, Norichika, Ura, Katsuya, Eguchi, Yuhei, Ise, Takashi, Sakai   +4 more
openaire   +2 more sources

Self-assembly of novel macrocyclic aminomethylphosphines with hydrophobic intramolecular cavities

Dalton Trans., 2004
Novel macroheterocyclic tetraphosphines, namely, 1,1',5,5'-bis(arylene)-bis(1,5-diaza-3,7-diphosphacyclooctanes) 2-6, were obtained without the use of high-dilution techniques or any matrix by the reaction of bis(hydroxymethyl)organylphosphines with primary aromatic diamines containing two p-phenylene fragments linked by various one-atom bridges in a ...
Anna S, Balueva, Roman M, Kuznetsov, Svetlana N, Ignat'eva, Andrey A, Karasik, Aidar T, Gubaidullin, Igor A, Litvinov, Oleg G, Sinyashin, Peter, Lönnecke, Evamarie, Hey-Hawkins   +8 more
openaire   +2 more sources

Chiral Selector with Multiple Hydrogen-Bonding Sites in a Macrocyclic Cavity

Organic Letters, 2008
Chiral macrocycles with the hydrogen bond donor/acceptor sites in the cavity were synthesized and covalently bonded to silica gel to give chiral stationary phases (CSPs), which showed excellent abilities to resolve various chiral compounds, such as benzoin and Co(acac)3, in HPLC.
Tadashi, Ema, Daisuke, Tanida, Kyoko, Sugita, Takashi, Sakai, Ken-ichiro, Miyazawa, Atsushi, Ohnishi   +5 more
openaire   +2 more sources

Giant Cavity Macrocycle: Synthesis, Structure, and Its Complexation with Pagoda[5]arene

Organic Letters, 2023
A novel stretched hexagon structure naphthalene diimides-extended-pillar[6]arene 1 with a giant cavity size of 18.769 Å in width and 17.109 Å in height is reported. 1 exhibits highly selective binding of pagoda[5]arene compared to pillar[5]arene and prism[5]arene.
Fei Zeng, Lin-Li Tang, Man-Hua Ding, Wubliker Dessie   +3 more
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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
openaire   +2 more sources

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
openaire   +1 more source

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
openaire   +2 more sources

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
openaire   +2 more sources

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
openaire   +1 more source