The supramolecular compound {[Sm(H2O)4]2(Cuc)3}Br6·44H2O (Cuc = C36H36N24O12) was synthesized. Its crystal and molecular structure was established by X-ray diffraction analysis. The binuclear complex cation {(Cuc)[Sm(H2O)4](Cuc)[Sm(H2O)4](Cuc)}6+ built from the alternating cucurbituril molecules (C36H36N24O12) and the [Sm(H2O)4]3+ aqua ions is a triple-decker nanosized (33 ) sandwich. 相似文献
Cucurbit[6]uril-based polymer nanocapsules (CB[6]PNs), covalently conjugated with a near-infrared dye (Cy 7), was exploited as a stable platform (Cy7-CB[6]PNs) for in vivo cancer targeting. The strong host-guest interaction between CB[6] and spermidine (spmd) enabled us to modify the surface of the nanocapsules with spmd-conjugated cancer targeting functional tags in a facile, controllable and non-covalent manner. Thanks to the strong host-guest interaction retained even in the bloodstream of a mouse, enhanced accumulation of Cy7-CB[6]PNs on cancer tissues of mice was successfully detected via NIR imaging when the nanocapsules were treated with more number of the cancer targeting functional tags. This result showed the potential of the CB[6]-based strong host-guest interaction as a controllable and efficient tool for surface modification of in vivo cancer targeting nanomaterials. 相似文献
The review surveys the synthesis and structures of a new class of supramolecular compounds composed of the macrocyclic cavitand cucurbituril and molybdenum or tungsten chalcogenide clusters. The structural motifs of supramolecular compounds and factors influencing their formation are considered. 相似文献
Interaction of a series of lanthanide cations (Ln3+) with a symmetrical octamethyl-substituted cucurbituril (OMeQ[6]) has been investigated. X-ray single-crystal diffraction analysis has revealed that the interaction results in the formation of adducts of OMeQ[6] with aqua complexes of lanthanide cations ([Ln(H2O)8]3+), Ln = Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb in OMeQ[6]–Ln(NO3)3–H2O systems. However, no solid crystals were obtained from systems containing La, Ce, Pr, Nd and Sm. X-ray diffraction analysis has revealed that although the solid adducts fall into two isomorphous groups, there are no significant differences in the interactions between OMeQ[6] and [Ln(H2O)8]3+ complexes and in the corresponding supramolecular assemblies. Thermodynamic parameters for the interaction between OMeQ[6] and [Ln(H2O)8]3+ complexes based on isothermal titration calorimetry experiments show two periods corresponding to the above two systems, with the lighter lanthanide cations preferring to remain in solution and the heavier lanthanide cations forming crystalline solids. Electron spectroscopy has shown that interaction of OMeQ[6] with lanthanide cations could provide a means of isolating heavier lanthanide cations from their lighter counterparts. 相似文献
Pseudopolyrotaxanes 4a and 5a are synthesized by two paths: a) directly from the pseudorotaxane, and b) by complexing with cucurbituril (CB[6]) in water at room temperature after the polymerization. Free radical copolymerization with CB[6] (un)complexed monomer and N‐isopropylacrylamide (NIPAAM) is carried out using a redox initiator in aqueous media at room temperature. The properties of pesudorotaxanes ( 4a and 5a ) and polymers ( 4 and 5 ) are investigated by TGA, DSC, and turbidity measurements. The lower critical solution temperatures of the NIPAAM‐containing copolymers and CB[6] are significantly higher than those of pure NIPAAM copolymers. The pseudopolyrotaxanes 4a and 5a have a higher thermal stability, as a result of threading of the CB[6] rings onto the polymer side groups.