A chromogenic crown ether as a sensing molecule in optical sensors for the detection of hard metal ions

1988 ◽  
pp. 893-895 ◽  
Author(s):  
Jos van Gent ◽  
Ernst J. R. Sudhölter ◽  
Paul V. Lambeck ◽  
Theo J. A. Popma ◽  
Gerrit J. Gerritsma ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Optical Sensors ◽  
Hard Metal

ChemInform Abstract: A Chromogenic Crown Ether as a Sensing Molecule in Optical Sensors for the Detection of Hard Metal Ions.

ChemInform ◽  
1989 ◽  
Vol 20 (3) ◽  
Author(s):  
J. VAN GENT ◽  
E. J. R. SUDHOELTER ◽  
P. V. LAMBECK ◽  
T. J. A. POPMA ◽  
G. J. GERRITSMA ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Optical Sensors ◽  
Hard Metal

Enhanced performance in gas adsorption and Li ion batteries by docking Li+ in a crown ether-based metal–organic framework

2016 ◽  
Vol 52 (14) ◽  
pp. 3003-3006 ◽  
Author(s):  
Linyi Bai ◽  
Binbin Tu ◽  
Yi Qi ◽  
Qiang Gao ◽  
Dong Liu ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
Li Ion Batteries ◽  
Metal Organic ◽  
Li Ion ◽  
Organic Framework

Incorporating supramolecular recognition units, crown ether rings, into metal–organic frameworks enables the docking of metal ions through complexation for enhanced performance.

Donor-acceptor Stenhouse Adducts with Three Orthogonally Controlled Intrisic Stationary States

2020 ◽  
Author(s):  
Yongli Duan ◽  
Haiquan Zhao ◽  
GuoDong Xue ◽  
Ze Wang ◽  
Chaoyue Xiong ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Smart Materials ◽  
Green Light ◽  
Supramolecular Structures ◽  
The Other ◽  
Van Der Waals Interactions ◽  
Stationary States ◽  
Complex Stimuli ◽  
Donor Acceptor

Abstract Photoresponsive molecules with more than two intrinsic stationary states are very Interesting. Here, we demonstrate a series of crown ether (CE) substituted donor-acceptor Stenhouse adducts (DASAs) that can be switched between three stationary states under orthogonal control of light and metal ions. DASA-CE molecules are self-assembled into 1:1 head-to-tail supramolecular structures to form di-linear states due to strong van der Waals interactions between electron-donating and -withdrawing moieties. Furthermore, treatment with metal ions (Na+ or K+) switches the di-linear back to the linear state, which is reversible after adding free crown ether. On the other hand, green light irradiation induces linear-to-cyclic isomerization of DASA-CE, while the photoisomerization from di-linear to cyclic state is inhibited. The reverse cyclic-to-linear isomerization can occur under heating in the dark. All in all, the orthogonal switching of DASA-CE between di-linear, linear and cyclic states enables the development of smart materials in environments with complex stimuli.

Mechanistische Untersuchungen zur Ligandenfluktuation in den Sandwich-Komplexen [M([12]Krone-4)2]++ / Mechanistic Studies on the Ligand Fluctuations in the Sandwich Complexes [M([12]crown-4)2]++

1984 ◽  
Vol 39 (12) ◽  
pp. 1755-1758 ◽  
Author(s):  
Franz L. Dickert ◽  
Walter Gumbrecht ◽  
Manfred Waidhas
Keyword(s):  
Crown Ether ◽  
Metal Ions ◽  
Reaction Order ◽  
Outer Sphere ◽  
High Symmetry ◽  
Mechanistic Studies ◽  
Sandwich Complexes ◽  
Associative Mechanism ◽  
M 12 ◽  
Very High

The metal ions Co++ , Ni++ , Mg++ , and Zn++ form the sandwich complexes [M([12]crown-4)2]++ with [12]crown-4 in CD3NO2. From the reaction order of the crown ether exchange a strong outer sphere association between complex and ligand can be inferred. Ligand fluctuation processes occur via an intramolecular associative mechanism from which a very high symmetry of the complexes results.

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