Metal–Organic Rotaxane Frameworks Assembly by Cucurbit[6]uril-Based Pseudorotaxanes and Mixed Ligands

Four
novel high-dimensional metal–organic rotaxane frameworks (MORFs)
were successfully fabricated by cucurbit[6]­uril-based pseudorotaxanes
([PR43]) and rigid carboxylate ligands by adjusting the synthesis
temperature and the length of ligands. Compound 1 represents
a three periodic 2-fold interpenetrating dia network based on a binuclear
{Cd2Cl4O4} second building unit (SBU). 2 and 3 are isostructural pcu networks constructed
by binuclear and trinuclear cadmium clusters, respectively, while
compound 4 is a two-dimensional layered network with
a large grid 44.3 × 19.8 Å2. Furthermore, their
fluorescent properties in different solvents are investigated.