In this work, we report a new polyoxovanadate-resorcin[4]arene-based metal-organic framework (PMOF), [CoLVO]·3DMF·5HO (1), assembled with a newly functionalized wheel-like resorcin[4]arene ligand (L). 1 features an elegant porous motif and represents a rare example of PMOFs composed of both a resorcin[4]arene ligand and polyoxovanadate. Remarkably, 1 shows open V sites in the channel, which makes 1 an efficient heterogeneous Lewis acid catalyst for the cycloaddition of carbon dioxide to epoxides with high conversion and selectivity. Strikingly, 1 also exhibits high catalytic activity for the heterogeneous oxidative desulfurization of sulfides. Particularly, the heterogeneous catalyst 1 can be easily separated and reused with good catalytic activity.

A new highly stable copper(I)-based metal-organic framework (MOF), namely, [Cu(SiWO)(L)]·6HO·2DMF (1), was synthesized by incorporating Keggin-type polyoxometalate (POM) anions and a functionalized wheel-like resorcin[4]arene-based ligand (L) under sovothermal condition. 1 exhibits a charming 3D supramolecular architecture sandwiched by the POM anions. Noticeably, 1 has exceptional chemical stability, especially in organic solvents or aqueous solutions with a wide range of pH values. Considering the catalytically active Cu(I) sites in 1, the azide-alkyne cycloaddition (AAC) reaction was studied by employing 1 as the heterogeneous catalyst. Most strikingly, 1 exhibits excellent catalytic activity as well as recyclability for the AAC reaction.

A stable microporous anionic metal-organic framework (MOF), [(CH)NH][CdL(HO)]·12HO (1), has been synthesized via solvothermal assembly of a new resorcin[4]arene-functionalized dodecacarboxylic acid (HL) and Cd(II) cations. The constructed MOF (1) was characterized by single-crystal X-ray diffraction and other physicochemical analyses. 1 exhibits a fascinating 3D microporous framework structure, in which the free water molecules and the [(CH)NH] cations were located. Remarkably, the exposed Lewis acid Cd(II) sites of activated 1 make it an efficient heterogeneous catalyst for the cycloaddition of CO with epoxides at 1 and 20 atm. Importantly, the activated samples of 1 can be reused at least five circles with excellent catalytic performance. Moreover, the fluorescence detection of CrO and Fe was studied by using 1 as a potential luminescent sensor.

Metal−organic framework (MOF)-supported metal nanoparticles (NPs) have been proven to be highly efficient in catalytic fields. In this work, palladium NPs were rationally confined in a MOF [Cu I 4 resorcin[4]arene ligand) to produce catalyst 1. The as-prepared catalyst 1 was characterized by powder X-ray diffraction, X-ray photoelectron spectroscopy, inductively coupled plasma optical atomic emission spectrometry, and transmission electron microscopy. The characteristic results indicated that Pd NPs were welldispersed in catalyst 1, with a mean particle size of 3.02 nm. Remarkably, catalyst 1 exhibited a high catalytic efficiency for the tandem reactions of NH 3 BH 3 dehydrogenation and nitroarene hydrogenation. Most strikingly, catalyst 1 still featured high catalytic activity after five cycles of reuse.

Effective and selective capture of environmentally toxic CrO from water is desirable for both environment protection and human health, but it still remains a significant challenge. We present a water-stable cationic metal-organic framework (MOF) with large nanotubular channels ( ca. 1.4 × 1.4 nm), (1-Cl). Remarkably, the resulting porous material exhibits rapid aqueous-phase removal of CrO via an anion-exchange manner. Meaningfully, the capture and separation of aqueous CrO are highly selective even in the presence of other disturbing anions. More importantly, the crystal structure of 1-Cl after anion exchange (1-CrO) could be determined by single crystal X-ray diffraction, elaborating the single-crystal-to-single-crystal (SC-SC) transformation. The CrO removal process by 1-Cl thus was directly uncovered by the crystal structure of CrO-incorporated 1-CrO.