scholarly journals High-affinity host–guest chemistry of large-ring cyclodextrins

2016 ◽  
Vol 14 (32) ◽  
pp. 7702-7706 ◽  
Author(s):  
Khaleel I. Assaf ◽  
Detlef Gabel ◽  
Wolfgang Zimmermann ◽  
Werner M. Nau
Keyword(s):  
Cluster Anions ◽  
Guest Molecules ◽  
Large Ring ◽  
High Affinity ◽  
Guest Chemistry

Unprecedented affinities for large-ring cyclodextrins have been achieved with purely inorganic guest molecules (dodecaborate cluster anions).

A new supramolecular catalytic system: the self-assembly of Rh8 cage host anthracene molecules for [4 + 4] cycloaddition induced by UV irradiation

2020 ◽  
Vol 49 (28) ◽  
pp. 9688-9693
Author(s):  
Wei-Bin Yu ◽  
Feng-Yi Qiu ◽  
Po Sun ◽  
Hua-Tian Shi ◽  
Zhi-Feng Xin
Keyword(s):  
Uv Irradiation ◽  
Catalytic System ◽  
Self Assembly ◽  
Uv Light ◽  
Cycloaddition Reaction ◽  
Supramolecular Assembly ◽  
The Self ◽  
Supramolecular System ◽  
Guest Molecules ◽  
Guest Chemistry

The supramolecular assembly is significant in host–guest chemistry. In this work, a new supramolecular system assembled through a distorted cuboid was introduced. Moreover, the [4 + 4] cycloaddition reaction of the guest molecules was further studied under UV light.

Carboxylated pillar[n]arene (n = 5–7) host molecules: high affinity and selective binding in water

2019 ◽  
Vol 17 (20) ◽  
pp. 5106-5111 ◽  
Author(s):  
Yamin Liu ◽  
Fang Zhou ◽  
Fan Yang ◽  
Da Ma
Keyword(s):  
Systematic Study ◽  
Water Soluble ◽  
Selective Binding ◽  
High Affinity ◽  
Host Molecules ◽  
Guest Chemistry

A systematic study of host–guest chemistry for water-soluble pillar[n]arenes in water.

Enzymatic Synthesis and Analysis of Large-Ring Cyclodextrins

2002 ◽  
Vol 55 (2) ◽  
pp. 39 ◽  
Author(s):  
M. Zheng ◽  
T. Endo ◽  
W. Zimmermann
Keyword(s):  
Physicochemical Properties ◽  
Recent Work ◽  
Enzymatic Synthesis ◽  
Degree Of Polymerization ◽  
Reaction Conditions ◽  
Guest Molecules ◽  
Large Ring ◽  
The Past ◽  
Specific Host ◽  
Wide Range

Large-ring cyclodextrins (LR-CD) are cyclic α-1,4-glucans composed of nine to more than several hundred glucopyranose units. Cyclodextrins are able to form highly specific inclusion complexes with a wide range of guest molecules thereby modifying their physicochemical properties. Only in the past 10 years, LR-CD with a degree of polymerization between 9 and 32 have been isolated and characterized. The structures of these LR-CD show novel features distinct from those of the extensively studied α- β-, and γ-CD composed of six, seven, and eight glucopyranose units, respectively. Recent work on the enzymatic synthesis of LR-CD has confirmed the ability of different 4-α-glucanotransferases to form large cyclic α-1,4-glucans from amylose and amylopectin, depending on the specificity of the enzyme used and on the substrate and reaction conditions chosen. The potential of LR-CD for specific host-guest interactions and corresponding applications has been demonstrated.

scholarly journals In situ reversible tuning of chemical interface damping in single gold nanorod-based recyclable platforms through manipulation of supramolecular host–guest interactions

2021 ◽  
Author(s):  
Hui Bin Jeon ◽  
Sehoon Park ◽  
Kyeong Rim Ryu ◽  
Suman Kr Ghosh ◽  
Jaehoon Jung ◽  
...  
Keyword(s):  
Gold Nanorod ◽  
Guest Molecules ◽  
Guest Chemistry

This study has paved a new route to achieve in situ reversible tuning of chemical interface damping (CID) in the same gold nanorod (AuNR) and to investigate the CID process using cucurbituril (CB)-based host–guest chemistry with various guest molecules in single AuNRs.

scholarly journals Molecular recognition using tetralactam macrocycles with parallel aromatic sidewalls

2019 ◽  
Vol 15 ◽  
pp. 1086-1095 ◽  
Author(s):  
Dong-Hao Li ◽  
Bradley D Smith
Keyword(s):  
Organic Solvents ◽  
Near Infrared ◽  
Ion Pairs ◽  
Hydrophobic Effect ◽  
Guest Molecules ◽  
High Affinity ◽  
Secondary Interactions ◽  
Wide Range ◽  
Polar Functional Groups ◽  
Macrocyclic Cavity

This review summarizes the supramolecular properties of tetralactam macrocycles that have parallel aromatic sidewalls and four NH residues directed into the macrocyclic cavity. These macrocycles are versatile hosts for a large number of different guest structures in water and organic solvents, and they are well-suited for a range of supramolecular applications. The macrocyclic cavity contains a mixture of polar functional groups and non-polar surfaces which is reminiscent of the amphiphilic binding pockets within many proteins. In water, the aromatic surfaces in the tetralactam cavity drive high affinity due the hydrophobic effect and the NH groups provide secondary interactions that induce binding selectivity. In organic solvents, the supramolecular factors are reversed; the polar NH groups drive high affinity and the aromatic surfaces provide the secondary interactions. In addition to an amphiphilic cavity, macrocyclic tetralactams exhibit conformational flexibility, and the combination of properties enables them to be effective hosts for a wide range of guest molecules including organic biscarbonyl derivatives, near-infrared dyes, acenes, precious metal halide complexes, trimethylammonium ion-pairs, and saccharides.

Host–Guest Chemistry from Solution to the Gas Phase: An Essential Role of Direct Interaction with Water for High-Affinity Binding of Cucurbit[n]urils

2013 ◽  
Vol 117 (29) ◽  
pp. 8855-8864 ◽  
Author(s):  
Shin Jung C. Lee ◽  
Jong Wha Lee ◽  
Hong Hee Lee ◽  
Jongcheol Seo ◽  
Dong Hun Noh ◽  
...  
Keyword(s):  
Gas Phase ◽  
Essential Role ◽  
Direct Interaction ◽  
Affinity Binding ◽  
High Affinity Binding ◽  
High Affinity ◽  
Guest Chemistry

Neuronal and Extraneuronal Uptake of 3H-Norepinephrine in the Heart of the Active Bat: An Electron Microscopic Radioautographic Study

1973 ◽  
Vol 31 ◽  
pp. 522-523
Author(s):  
Martin Hagopian ◽  
Michael D. Gershon ◽  
Eladio A. Nunez
Keyword(s):  
Smooth Muscle ◽  
Monoamine Oxidase ◽  
Vascular Smooth Muscle ◽  
Cardiac Muscle ◽  
Maximum Rate ◽  
External Medium ◽  
Extraneuronal Uptake ◽  
Electron Microscopic ◽  
Cardiac Tissues ◽  
High Affinity

The ability of cardiac tissues to take up norepinephrine from an external medium is well known. Two mechanisms, called Uptake and Uptake respectively by Iversen have been differentiated. Uptake is a high affinity system associated with adrenergic neuronal elements. Uptake is a low affinity system, with a higher maximum rate than that of Uptake. Uptake has been associated with extraneuronal tissues such as cardiac muscle, fibroblasts or vascular smooth muscle. At low perfusion concentrations of norepinephrine most of the amine taken up by Uptake is metabolized. In order to study the localization of sites of norepinephrine storage following its uptake in the active bat heart, tritiated norepinephrine (2.5 mCi; 0.064 mg) was given intravenously to 2 bats. Monoamine oxidase had been inhibited with pheniprazine (10 mg/kg) one hour previously to decrease metabolism of norepinephrine.

Tuning the configuration of the flexible metal–alkene-framework affords pure cycloisomers in solid state photodimerization

2021 ◽  
Author(s):  
Yong Wang ◽  
Meng-Fan Wang ◽  
David James Young ◽  
Hua Zhu ◽  
Fei-Long Hu ◽  
...  
Keyword(s):  
Solid State ◽  
Cycloaddition Reaction ◽  
Guest Molecules ◽  
Flexible Metal

The bulkiness of the guest molecules influences the conformations of the ligand and the final outcomes of the cycloaddition reaction.

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