Coordination and Supramolecular Assemblies of Fully Substituted Cyclopentanocucurbit[6]uril with Lanthanide Cations in the Presence of Tetrachlorozincate Anions, and Their Potential Applications.

Coordination and supramolecular assemblies of a fully substituted cyclopentanocucurbit[6]uril (CyPQ[6]) with a series of lanthanide cations (Ln) have been investigated in the presence of tetrachlorozincate anion ([ZnCl]). X-ray single-crystal diffraction analysis has revealed that the interaction of CyPQ[6] and a series of Lncations unexpectedly results in the formation of at least seven different CyPQ[6]-based coordination complex adduct and supramolecular assemblies groups, including with (1) La, Cecations; (2) Pr, Ndcations; (3) Eu, Gd, Tb, Dy with P1̅ or P1 space group, in which CyPQ[6] molecules coordinate alternatively with Lncations and form linear coordination polymers; (4) CyPQ[6] molecules interact alternatively with [Ho(HO)] aqueous complexes and form linear supramolecular chains; CyPQ[6] molecules can assemble two different Ln free porous supramolecular assemblies from CyPQ[6]-Ln(NO)-ZnCl-HCl systems, Ln = Tm, Yb, and Lu; however, no solid crystals were obtained from system containing Ercation. Thus, these differences could lead CyPQ[6] to be useful in not only the isolation of lighter lanthanides from their heavier lanthanides but also special selectivity for different volatile organic compounds.