The impact of the lanthanide contraction on the structure of complexes of a calixarene trisamide
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The syntheses of samarium, holmium, and ytterbium complexes of a tris-amide calixarene 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)calixarene 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.
The final publication is available at Springer via 10.1007/s10847-009-9613-y
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