Protonation and metal-ion complexation in aqueous solution by pyridine-containing hexaaza macrocycles

1996 ◽  
pp. 1753 ◽  
Author(s):  
Karin I. Dhont ◽  
Gerrit G. Herman ◽  
Antonio C. Fabretti ◽  
Werner Lippens ◽  
Andr� M. Goeminne
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Metal Ion Complexation ◽  
Ion Complexation

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.

Metal Ion Complexation in Aqueous Solution by 5-Thia-2,8-Diazanonane-N,N′-Diacetic Acid

2010 ◽  
Vol 102 (9) ◽  
pp. 593-600 ◽  
Author(s):  
D. M. Wambeke ◽  
W. Lippens ◽  
G. G. Herman ◽  
A. M. Goeminne
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Diacetic Acid ◽  
Metal Ion Complexation ◽  
Ion Complexation

Metal ion complexation studies in an aqueous solution of 1-thia-4,7-diazacyclononane, 1- thia-4,8-diazacyclodecane and 5-thia-2,8- diazanonane

Polyhedron ◽  
1992 ◽  
Vol 11 (23) ◽  
pp. 2989-2995 ◽  
Author(s):  
Dorine M. Wambeke ◽  
Werner Lippens ◽  
Gerrit G. Herman ◽  
Andre M. Goeminne ◽  
Gustaaf P. Van der Kelen
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Metal Ion Complexation ◽  
Complexation Studies ◽  
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

Metal ion complexation in acetonitrile by di-ionized calix[4]arenes bearing two dansyl fluorophores

2008 ◽  
Vol 63 (1-2) ◽  
pp. 131-139 ◽  
Author(s):  
Ümmühan Ocak ◽  
Miraç Ocak ◽  
Kazimierz Surowiec ◽  
Richard A. Bartsch ◽  
Maryna G. Gorbunova ◽  
...  
Keyword(s):  
Metal Ion ◽  
Metal Ion Complexation ◽  
Ion Complexation
Sign in / Sign up

Export Citation Format

Share Document