The syntheses of samarium, holmium, and ytterbiumcomplexes of a tris-amide calixarene are described,and the resulting structures are compared with the previouslyreported gadolinium complex. The syntheses involvedthe reaction of 5,11,17,23-tetra-tert-butyl-24-hydroxy-26,27,28-tris(diethylcarbamoylmethoxy)calixarene with theappropriate lanthanide picrate hydrate. Structural studiesdemonstrated that a picrate anion acts as a quasi-bidentateligand with Sm (and Gd), is unidentate in the Ho complex,but is found in the second coordination sphere for thesmallest lanthanide cation (Yb) investigated.
|Journal||Journal of Inclusion Phenomena and Macrocyclic Chemistry|
|Publication status||Published - 2009|