Results 21 to 30 of about 1,117,391 (197)

AB INITIO INVESTIGATION OF 12-CROWN-4 AND BENZO-12-CROWN-4 COMPLEXES WITH Li⁺, Na⁺, K⁺, Zn²⁺, Cd²⁺, AND Hg²⁺

Indonesian Journal of Chemistry, 2010
The structure and binding energies of 12-crown-4 and benzo-12-crown-4 complexes with Li+, Na+, K+, Zn2+, Cd2+, and Hg2+were investigated with ab initio calculations using Hartree-Fock approximation and second-order perturbation theory. The basis set used
Yahmin Yahmin, Harno Dwi Pranowo, Ria Armunanto   +2 more
doaj   +1 more source

Fluorescent Supramolecular Polymers Formed by Crown Ether-Based Host-Guest Interaction

Frontiers in Chemistry, 2020
Inspired by the vast array of assemblies present in nature, supramolecular chemistry has attracted significant attention on account of its diverse supra-structures, which include micelles, vesicles, and fibers, in addition to its extensive applications ...
Jinjin Zhang, Huayu Qiu, Huayu Qiu, Tian He, Yang Li, Shouchun Yin   +5 more
doaj   +1 more source

Polarographic Study of the Interactions between Thallium and Lead Ions and Some Crown Ethers in 90% Acetonitrile and 90% Ethanol Solutions [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 1996
The complexation reactions between Tl+ and Pb2+ ions and crown ethers 12-crown-4(12C4), 15-crown-5 (15C5), benzo-15-crown-5 (B15C5), 18-crown-6 (18C6), dicyclohexyl-18-crown-6 (DC18C6) and aza-18-crown-6 (A18C6) were studied in 90% acetonitrile and 90 ...
Mojtaba Shamsipour, Abolfazl Semnani
doaj  

Divalent ytterbium complexes with crown and heterocrown ethers

Dalton Transactions, 2015
Unusual complexes of ytterbium( ii ) stabilised by coordination to mixed O 4 X 2 -donor macrocyclic ligands (X = O, NH, S or Se) are described.
Bartlett, Philip N., Champion, Martin, Light, Mark. E., Levason, William, Reid, Gillian, Richardson, Peter W.   +5 more
openaire   +4 more sources

Deprotonation and Alkylation of Weakly Acidic C(sp3)─H Bonds Through In Situ Generation of a Strong Hydride Base From 1,1,3,3‐Tetramethyldisiloxane and Potassium tert‐Butoxide

Angewandte Chemie, EarlyView.
The use of 1,1,3,3‐tetramethyldisiloxane (TMDSO) and potassium tert‐butoxide enables direct alkylation of weakly acidic carbon–hydrogen bonds with alkyl halides. Experimental and computational studies support the formation of a substrate‐associated hydride‐like base, providing a single‐step alternative to the classical deprotonation and electrophile ...
Piers St. Onge, Brandon White, Han Yao, Travis Dudding, Stephen G. Newman   +4 more
wiley   +2 more sources

THEORETICAL STUDY ON 15-CROWN-5 COMPLEX WITH SOME METAL CATIONS

Indonesian Journal of Chemistry, 2012
The capability of 15-crown-5 ethers to form complexes with some metal cations (Li+, Na+, K+, Zn2+, Cd2+ and Hg2+) was investigated by an ab initio quantum mechanical method. The calculations were performed at the RHF/lanl2mb level of theory.
Yahmin Yahmin, Harno Dwi Pranowo, Ria Armunanto   +2 more
doaj   +1 more source

Crown Ethers and Analogs: Updates from the Chemistry of the Functional Groups

, 2010
This second book in the Patai Updates "mini series" relates to four chapters from the original Supplement E and to Supplement C. Coverage includes complexation of aryldiazonium ions by polyethers, complexes and selectivity of crown ethers, and structural
Laidler, Dale A., Stoddart, J. Fraser, Toner, John L., Liotta, Charles L., Patai, Saul, VöGtle, Fritz, Goldberg, Israel, Weber, Edwin, Rappoport, Zvi, Bartsch, Richard A.   +9 more
core   +1 more source

Data for: Record Low Ionization Potentials of Alkali Metal Complexes with Crown Ethers and Cryptands [PDF]

, 2021
Electronic properties of series of alkali metals complexes with crown ethers and cryptands were studied via DFT hybrid functionals. For [M([2.2.2]crypt)] (M=Li, Na, K) extremely low (1.70–1.52 eV) adiabatic ionization potentials were found.
Boldyrev, Alexander I., Tkachenko, Nikolay   +1 more
core   +1 more source

High‐Efficiency Deep Blue Single‐Gaussian Europium(II) Emitters and Their Emitter‐Host Interactions

Advanced Functional Materials, EarlyView.
Crown‐ether ligands and carborate anions enable vacuum‐processable Eu(II) emitters with efficient single‐Gaussian deep‐blue luminescence. Combined photophysical and computational analyses reveal that excited‐electron confinement and steric shielding of the europium center jointly govern compatibility with OLED host materials, establishing molecular ...
Mahmoud Soleimani, Paulius Imbrasas, Jan‐Michael Mewes, Felix Kaden, Stephanie Anna Buchholtz, Karl Leo, Sebastian Schellhammer, Carsten Rothe, Sebastian Reineke   +8 more
wiley   +1 more source

Clustomesogen Showing Sub‐Zero Liquid Crystal Properties: Supramolecular Assembly Between Cs2[Mo6Ii8(OCOC2F5)6] and Hexaethylenoxide Containing Mesogenic Dimers

Advanced Materials, EarlyView.
Associating a red‐NIR phosphorescent octahedral hexanuclear molybdenum cluster compound with hexaethyleneoxide chains bearing mesogenic units on both ends leads to an emissive hybrid liquid crystal showing mesomorphism on a very unusual temperature range down to −25°C.
Killiann Heinz, Jeanne Rebours, Zoulikha Zerrouqi, Noée Dumait, Maria Amela‐Cortes, Nikolai Scheuring, Sara Simonovska, Sebastian Marino, Max Ebert, Stéphane Cordier, Sabine Laschat, Yann Molard   +11 more
wiley   +1 more source