Cyclen based bis-macrocyclic ligands as phosphates receptors. A potentiometric and NMR study.
Dalton Trans
; (18): 3016-24, 2005 Sep 21.
Article
em En
| MEDLINE
| ID: mdl-16127495
ABSTRACT
The host-guest interaction between orthophosphate, pyrophosphate and triphosphate anions and four cyclen based bis-macrocycles ligands possessing ortho-(BOC), meta-(BMC), para-xylenyl (BPC) or 2,6-pyridinyl (BPyC) linker was investigated by potentiometric measurements and NMR spectroscopy. Each ligand gave protonated species in aqueous solution that further formed ternary complexes after binding with anions; these complexes were analyzed as a result of hydrogen bond formation and Coulombic attraction between the organic host and the inorganic guest. The equilibrium constants for all the detected species are reported and the selectivity, illustrated with species distribution diagrams, is discussed. The results unambiguously showed the importance of the distance between the two cyclen cores and underlined, especially for the triphosphate species, the contribution of the nitrogen atom of the pyridinyl spacer as a supplementary anchoring point in acidic medium.
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Bases de dados:
MEDLINE
Assunto principal:
Fosfatos
/
Espectroscopia de Ressonância Magnética
/
Compostos Macrocíclicos
/
Compostos Heterocíclicos
Tipo de estudo:
Diagnostic_studies
Idioma:
En
Revista:
Dalton Trans
Assunto da revista:
QUIMICA
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
França