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A calix(4)arene pyridine derivative and its monomeric component: structural and thermodynamic aspects of their complexation with metal cations.

Authors :
Danil de Namor AF
Aguilar-Cornejo A
Soualhi R
Shehab M
Nolan KB
Ouazzani N
Mandi L
Source :
The journal of physical chemistry. B [J Phys Chem B] 2005 Aug 04; Vol. 109 (30), pp. 14735-41.
Publication Year :
2005

Abstract

The interaction of a calix(4)arene derivative, namely 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetra[2-(4-pyridyl)methoxy]calix(4)arene, 1a, and its monomeric component, p-tert-butylphenoxy-4-pyridine, 1b, with metal cations has been investigated in acetonitrile and methanol. (1)H NMR measurements carried out in CD(3)CN show the primary role played by the pyridyl nitrogens in their complexation with metal cations. Conductance measurements demonstrated that for all cations (except mercury) the composition of the metal ion complexes of 1a is 1:1 (ligand:metal cation). However, 1a hosts two mercury cations per unit of ligand. For the monomer 1b, complexes of 2:1 (ligand:metal cation) stoichiometries are formed with the exception of Pb(2+) (1:1 composition). The thermodynamics of complexation of these systems are reported in acetonitrile. Data in methanol are limited to stability constant values for mercury(II) and these ligands. This paper demonstrates for the first time that thermodynamic data for the complexation of the monomeric component of the ligand and metal cations contribute significantly to the interpretation of systems involving cation-calixarene interactions in solution.

Details

Language :
English
ISSN :
1520-6106
Volume :
109
Issue :
30
Database :
MEDLINE
Journal :
The journal of physical chemistry. B
Publication Type :
Academic Journal
Accession number :
16852858
Full Text :
https://doi.org/10.1021/jp0514630