scholarly journals A novel profluorescent paramagnetic diaza-crown ether: synthesis, characterization and alkaline metal-ion complexation

RSC Advances ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 6078-6083 ◽  
Author(s):  
Anca G. Coman ◽  
Cristina Stavarache ◽  
Anca Paun ◽  
Codruţa C. Popescu ◽  
Niculina D. Hădade ◽  
...  
Keyword(s):  
Free Radical ◽  
Crown Ether ◽  
Metal Ion ◽  
The Other ◽  
Alkaline Metal ◽  
Metal Ion Complexation ◽  
Stable Free Radical ◽  
Ion Complexation ◽  
Fluorescent Moiety ◽  
Ether Synthesis

Starting from Kryptofix 22 two different branches were covalently attached through the nitrogen atoms, one containing a fluorescent moiety and the other the stable free radical TEMPO.

Synthesis and metal ion complexation behavior of polycarboxylate 18-crown-6 ethers derived from tartaric acid

1988 ◽  
Vol 66 (5) ◽  
pp. 1097-1108 ◽  
Author(s):  
Philip J. Dutton ◽  
Thomas M. Fyles ◽  
Susan J. McDermid
Keyword(s):  
Aqueous Solution ◽  
Crown Ether ◽  
Tartaric Acid ◽  
Metal Ion ◽  
Electrostatic Interactions ◽  
Complexing Agents ◽  
Acidity Constants ◽  
Metal Ion Complexation ◽  
Ion Complexation ◽  
Anionic Charge

The metal ion complexation behavior of four 18-crown-6 ethers derived from (+)- and meso-tartaric acid is examined. Preparations of a meso-crown ether diacid and of a crown ether hexacid from three units of (+)-tartaric acid are described. Acidity constants and stability constants for complexation of metal cations in aqueous solution were determined by potentiometric titration. The complexes are substantially stabilized by favourable electrostatic interactions and are of similar stability to complexes of cryptands and EDTA. The complexation behavior of the series can be rationalized in terms of electrostatic interactions, direct coordination of the cations by at least one carboxylate from the crown ether periphery, and rigidification of the ligands as the anionic charge increases. Distributions of charge influence the relative stability of isomeric complexes. Highly charged polycarboxylate crown ethers are effective, but relatively unselective, cation complexing agents for a range of cations. The complexes are stable to pH 3 and the ligands can be used as simultaneous pH and metal ion buffers.

Dependence of metal ion complexation and intermolecular aggregation on photoinduced geometric isomerism in a crown ether styryl dye

1992 ◽  
Vol 114 (16) ◽  
pp. 6381-6385 ◽  
Author(s):  
A. V. Barzykin ◽  
Marye Anne Fox ◽  
E. N. Ushakov ◽  
O. B. Stanislavskii ◽  
S. P. Gromov ◽  
...  
Keyword(s):  
Crown Ether ◽  
Metal Ion ◽  
Metal Ion Complexation ◽  
Geometric Isomerism ◽  
Styryl Dye ◽  
Ion Complexation

Bis-(quinolin-8-ylmethyl)-substituted Diaza-18-crown-6: Synthesis and Metal Ion Complexation Properties

2000 ◽  
Author(s):  
Jerald S. Bradshaw ◽  
Guoping Xue ◽  
Xian X. Zhang ◽  
Paul B. Savage ◽  
Krzysztof E. Krakowiak
Keyword(s):  
Metal Ion ◽  
Metal Ion Complexation ◽  
Ion Complexation

Influence of metal ion complexation on the metastable fragmentation of DNA hexamers

2014 ◽  
Vol 68 (6) ◽  
Author(s):  
Andreas Piekarczyk ◽  
Ilko Bald ◽  
Helga D. Flosadóttir ◽  
Benedikt Ómarsson ◽  
Anne Lafosse ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Ion Complexation ◽  
Metastable Fragmentation ◽  
Ion Complexation

Metal ion complexation in organometallic crown ethers

1998 ◽  
Vol 551 (1-2) ◽  
pp. 331-338 ◽  
Author(s):  
Valerio Berdini ◽  
Mauro Bassetti ◽  
Giovanna Mancini ◽  
Luigi Mandolini ◽  
Donato Monti
Keyword(s):  
Crown Ethers ◽  
Metal Ion ◽  
Metal Ion Complexation ◽  
Ion Complexation
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