KSIĄŻKI POWIĄZANE ZE SŁOWEM «CROWN ETHER»
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1
Effect of addition of
crown ether on the micellar behavior ...
The micellar properties of cationic dodecyltrimethylammonium chloride (DTAC) in aqueous media in the presence of 15-crown-5ether (CR) have been investigated by conductivity measurements over the temperature range 288.15-308.15 K. The ...
Rajni Garg, R.D. Singh, 2011
Organic chemistry may now be performed with these inorganic ions by putting the
crown ether-cation complex into a non-aqueous hydrophobic solvent. A similar
mechanism of complex formation may be responsible for the way such metal ...
3
Enzymes in Nonaqueous Solvents: Methods and Protocols
This way of drying proteins is relatively fast compared to lyophilization. In order to
investigate the crown ether activation, 18-crown-6 has been added at three
different stages during this precipitation procedure: (1) addition to the aqueous
buffer ...
Evgeny N. Vulfson, Peter J. Halling, Herbert L. Holland, 2001
4
Competition Science Vision
The crown ethers are an interesting class of poly- ethers, the important
complexing agents, first synthe- sised by Pedersen in 1967. An example of crown
ether is dibenzo-18-crown-6. The name indicates that there are two benzene
rings in the ...
5
Phosphazenes: A Worldwide Insight
As can be seen in Figure 5, the addition of crown ether entities to the metal
solution cause in any case a continuous decrease of the molar conductance. This
indicates a lower mobility of the Na+ and K+ ion crown cavity complex compared
to ...
Mario Gleria, Roger De Jaeger, 2004
Crown ether statistically threaded the polymer chain to produce
pseudopolyrotaxane. It was postulated that hydrogen-bonding interaction
between the hydroxy group in tetra(ethylene glycol) or the NH group on the
urethane group with crown ...
7
Proceedings of the Symposium on Lithium Batteries
... W. K. Behl Army Research Laboratory 2800 Powder Mill Rd AdelphLMD 20783
-1197 ABSTRACT Pentamethyldiethylenetriamine (PMDT), tetra(ethylene glycol)
dimethyl ether (tetraglyme), and the crown ether 12-Crown-4 were investigated ...
Subbarao Surampudi, Richard A. Marsh, 1999
8
Separation Methods in Drug Synthesis and Purification
... primary alkylamines crown-ether (Crownpak CR) I34] Alicyclic B-amino acids:
cis and trans crown-ether (Crownpak CR) [35] 2-aminocyclohexane-1-carboxylic
acids and cis and trans 2-amino-4-cyclohexene-1-carboxylic acids 2-(2-Amino-l ...
9
The Porphyrin Handbook: Phthalocyanines: Properties and ...
In the absence of alkali metal ions, these crown ether phthalocyanines aggregate
in solution. While dimerization constants were not reported for the alkali metal
free association, its ranking of solvent dependence was observed (Table 10).
Karl Kadish, Roger Guilard, Kevin M. Smith, 2006
10
The Porphyrin Handbook: Multiporphyrins, ...
Karl M. Kadish, Kevin M. Smith, Roger Guilard. u — 1: Interaction Hydrogen
Bonding \! Left-handed Helix Figure 9. Structures of the first achiral crown ether
phthalocyanines. Figure B. Speculated pathways for the formation of fibrous ...
Karl M. Kadish, Kevin M. Smith, Roger Guilard, 2003
WIADOMOŚCI, KTÓRE ZAWIERAJĄ SŁOWO «CROWN ETHER»
Sprawdź, o czym dyskutuje się w prasie krajowej i zagranicznej oraz jak jest stosowane słowo
crown ether w wiadomościach.
At Pennsville's Chambers Works, Chemours debuts, word of future …
Teflon was invented there and a chemist, Salem's Charles Pedersen, who worked there and discovered the crown ether molecule, was ... «NJ.com, Lip 15»
Molecular shuttle slides into the solid state
The shuttle is made up of a crown ether macrocycle and two benzimidazole sites, which act as the destinations. The researchers argue that this ... «Royal Society of Chemistry, Maj 15»
Metal-organic framework with a fixed composition despite initial …
It is comprised of organic struts with the same backbone and but with side chains that are either a crown ether or a catenane. Both crown ether ... «Phys.Org, Maj 15»
Unexpected success with luminescent liquid crystals
In this proof of concept, cationic complexes were formed between a crown ether and alkali cations (Cs+), which associate with an octahedral ... «Royal Society of Chemistry, Lut 15»
Crown ethers flatten in graphene for strong, specific binding
Link them together in large molecular rings and they become scientific royalty—crown ether molecules, whose development led in large part to ... «Phys.Org, Gru 14»
New DuPont Chambers Works plant manager ready to take on big …
... at Chambers Works – became the first DuPont employee company-wide ever to win a Nobel Prize for the discovery of crown ether molecules. «NJ.com, Gru 14»
Lanthanides Topple Assumptions
A potassium atom donates an electron to the lanthanide(III) complex. The resulting K+ is sequestered by a crown ether, 18-crown-6, or similar ... «The Biological SCENE, Cze 13»
Rice Strategy Turns Negatively Charged Carbon Nanotubes into …
Crown ether “cages” trap potassium ions but leave nanotubes with a repellant negative charge in solutions that will be valuable for forming very ... «AZoNano.com, Maj 13»
'Going negative' pays for nanotubes: Team finds possible keys to …
Crown ether "cages" trap potassium ions but leave nanotubes with a repellant negative charge in solutions that will be valuable for forming very ... «Phys.Org, Maj 13»
New compound reveals intriguing properties of uranium
The resultant sodium salt was treated with a crown ether, a chemical efficient at chelating cations such as sodium, to free the anionic product in ... «Varsity, Lis 12»
