LANTHANIDE ION COMPLEXES OF CALIXARENES .8. BIMETALLIC LANTHANIDE COMPLEXES OF PARA-TERT-BUTYLCALIX[8]ARENE FROM DIMETHYLFORMAMIDE SOLUTIONS

Reaction of lanthanide(III) ion p-toluenesulfonates with a warm p-t-butylcalix[8]arene (L) solution in dmf/triethylamine (dmf denotes N,N-dimethylformamide), yields crystalline 2:1 Ln/ligand adducts, as dmf solvates: [Ln2(L-6H)(dmf)5].xdmf, Ln = La, Pr, Lu and Eu (previously recorded; 2 phases) have been characterized by single-crystal X-ray studies; all phases are triclinic but only the praseodymium and alpha-form of the europium derivative are isostructural: Ln = La, Pr, alpha-Eu have Z = 2 formula units, while Ln = beta-Eu, Lu have Z = 4. In all cases, the stoichiometry of the complex molecule is the same and the same as that of the dmso adducts recorded in the previous paper, with similar ligand dispositions.