The impact of the lanthanide contraction on the structure of complexes of a calix[4]arene trisamide

The syntheses of samarium, holmium, and ytterbium complexes of a tris-amide calix[4]arene are described, and the resulting structures are compared with the previously reported gadolinium complex. The syntheses involved the reaction of 5,11,17,23-tetra- tert -butyl-24-hydroxy-26,27,28-tris(diethylcar...

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Bibliographic Details
Published inJournal of Inclusion Phenomena and Macrocyclic Chemistry Vol. 65; no. 1-2; pp. 25 - 30
Main Authors Nealon, G. L., Mocerino, M., Ogden, M. I., Skelton, B. W.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.10.2009
Subjects
Chemistry
Chemistry and Materials Science
Crystallography and Scattering Methods
Food Science
Organic Chemistry
Original Article
Lanthanide
Second-sphere coordination
Calixarene
Picrate
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Summary:The syntheses of samarium, holmium, and ytterbium complexes of a tris-amide calix[4]arene are described, and the resulting structures are compared with the previously reported gadolinium complex. The syntheses involved the reaction of 5,11,17,23-tetra- tert -butyl-24-hydroxy-26,27,28-tris(diethylcarbamoylmethoxy)calix[4]arene with the appropriate lanthanide picrate hydrate. Structural studies demonstrated that a picrate anion acts as a quasi -bidentate ligand with Sm (and Gd), is unidentate in the Ho complex, but is found in the second coordination sphere for the smallest lanthanide cation (Yb) investigated.
ISSN:0923-0750
1573-1111
DOI:10.1007/s10847-009-9613-y