Cucurbit[6]uril as ligand for the complexation of lanthanide cations in aqueous solution

The complex formation between lanthanide cations and the macrocyclic ligand cucurbit[6]uril has been studied in aqueous solution and in aqueous formic acid using different experimental techniques. With the exception of Nd 3+ the stability constants of all complexes formed in aqueous formic acid are...

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Bibliographic Details
Published inInorganic chemistry communications Vol. 6; no. 5; pp. 531 - 534
Main Authors Buschmann, H.-J., Jansen, K., Schollmeyer, E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2003
Subjects
Calorimetry
Complexes
Cucurbituril
Lanthanide
Calorimetry
Lanthanide
Complexes
Cucurbituril
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Summary:The complex formation between lanthanide cations and the macrocyclic ligand cucurbit[6]uril has been studied in aqueous solution and in aqueous formic acid using different experimental techniques. With the exception of Nd 3+ the stability constants of all complexes formed in aqueous formic acid are nearly identical. The values of the reaction enthalpies abruptly increase from a mean value of 1–3.4 kJ mol −1 going from Eu 3+ to Gd 3+. The values of the reaction entropies are nearly identical for all lanthanide cations. In pure aqueous solution a slight increase of the stability constants from La 3+ to Lu 3+ is observed.
ISSN:1387-7003
1879-0259
DOI:10.1016/S1387-7003(03)00033-9