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The first CB[6]-based 3D porous metal-organic rotaxane framework is constructed by the reaction of CuCl2, terephthalic (H2BDC) and CB[6]-based [2]pseudorotaxanes ([PR44]2+·2[PF6]-) under solvothermal conditions. The structure of MORF-1 is a pillared-layer structure with 5-connected sqp topology, in which the effective free volume is 45.4% of the crystal volume. The guest molecules exchange in a single-crystal-to-single-crystal fashion, which was investigated using NMR spectroscopy and X-ray crystallography.

Threading molecular square "beads" on a twofold interpenetrated diamondoid skeleton gives a new type of 3D metal-organic polyrotaxane framework with large channels, in which nanosized Keggin anions as guests are encapsulated for the first time.

Assembly of cucurbit[6] and a {Cd2Ge8V12O48} cluster produced two rotaxane-shaped and polyrotaxane-shaped solids by changing the ratio of starting precursors in the system. The high oxygen density of the polyoxoanion surface provides active sites to extend a single rotaxane-shaped hybrid 1 to a 1D polyrotaxane-shaped hybrid 2. This construction strategy may afford an entirely new methodology for polyoxometalate-based hybrid chemistry. [ABSTRACT FROM AUTHOR]

A novel metal–organic compound, namely [Zn6(bib)6L6]·7H2O (1) where H2L = 4-(4-carboxybenzyloxy)benzoic acid, and bib = 4,4′-bis(imidazol-1-ylmethyl)benzene, has been synthesized under hydrothermal conditions. Its structure was determined by single-crystal X-ray diffraction analysis and further characterized by elemental analysis and thermogravimetric (TG) analysis. In the structure of 1, two bib ligands cuddle two metal ions to form a ring, and are linked by deprotonated L2−to form a 6-fold interpenetrated 3D framework. From the topological analysis, each ZnIIion is considered as a three-connected node, and a pair of bib ligands and L2−anions are linkers. The framework of compound 1can be classified as a (62·10)(6·102)(102·12) topology, which is a novel 3-connected [3 + 3] 6-fold interpenetrated net showing both polyrotaxane and polycatenane characters. In addition, the luminescent properties of the compound are discussed. [ABSTRACT FROM AUTHOR]

Three novel self-catenated 4-connected uninodal (65·8)-mok metal–organic rotaxane frameworks (MORFs) containing cucurbit[6]uril were constructed from the in situ trans/cis-configuration (1 : 1) of rotaxanes by taking advantage of a d10 metal ion directed synthesis. It was revealed that the effect of hydrogen bonds and π–π stacking interactions play significant roles in the self-assembly process. [ABSTRACT FROM AUTHOR]

A novel compound, [Cu(bimb)]2(HPW12O40)·3H2O (bimb = 1,4-bis(imidazol-1-ylmethyl)biphenyl) with a polyoxometalate-encapsulated 3D metal–organic pseudo-rotaxaneframework that can be described as a 2-fold dianet topology showing well-defined 1D nano-scale tunnels, has been synthesized hydrothermally, and its de-/rehydration behavior has been investigated. [ABSTRACT FROM AUTHOR]

We describe here two unusual polyrotaxane-like metal–organic frameworks of [Co2(1,3-bix)2(bpea)2] 1and [Cd4(1,4-bix)4(bpea)4]·4H2O 2, where both species contain loops and rods that are interlaced in a highly rare “parallel” fashion in 1, but, uniquely, in an “inclined” fashion in 2. [ABSTRACT FROM AUTHOR]

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 Ų. Furthermore, their fluorescent properties in different solvents are investigated. [ABSTRACT FROM AUTHOR]

Catenation of 2D layers of rings with a 3D frame of pcu topology gives a new type of entangled framework incorporating functional, nanosized polyoxoanions, which exhibits both polycatenane and polyrotaxane character. [ABSTRACT FROM AUTHOR]