Structural Regulation of Two Polyoxometalate-Based Metal–Organic Frameworks for the Heterogeneous Catalysis of Quinazolinones

Abstract

Two dimeric {ε-Zn 4 PMo 12 }-based metal−organic frameworks (MOFs), [ε-PMo 8 V Mo 4 VI O 34 (OH) 6 Zn 4 ][LO] (SDUT-21, LO = [5-((4′-carboxybenzyl)oxy)isophthalic acid]) and [TBA] 3 [ε-PMo 8 V Mo 4 VI O 37 (OH) 3 Zn 4 ][LN] (SDUT-22, TBA + = tetrabutylammonium ion, LN = [5-((4-carboxybenzyl)imino)isophthalic acid]), combining the advantages of polyoxometalates (POMs) and MOFs, were synthesized by the one-pot assembly strategy. The dimeric {ε-Zn 4 PMo 12 } units act as nodes that are linked by the flexible ligands and extended into two-or threedimensional frameworks. The cyclic voltammetry and proton conductivity measurements of SDUT-21 and SDUT-22 were performed and indicated the high electron and proton transfer abilities. These materials also e xhibited the catalytic performance for the synthesis of quinazolinones in the heterogeneous state, and the different binding capacities toward the substrates caused the catalytic activity of SDUT-21 to be higher than that of SDUT-22 under the same conditions. In addition, the used catalysts could be readily recovered for five successive cycles and maintained high catalytic efficiency.

Two isostructural Zn/Co-MOFs with penetrating structures: multifunctional properties of both luminescence sensing and conversion of CO2 into cyclic carbonates

“…36,37 We have been committed to the fabrication of MOFs with novel fluorescence sensing ability and/or catalytic functions. [38][39][40][41][42][43][44][45][46][47][48] In this work, two isostructural penetrating Zn/Co-MOFs, namely {[Zn(HL)(bpea)]•DMF} n (Zn-MOF-1) and {[Co(HL)(bpea)]•DMF} n (Co-MOF-2), were assembled from an ether-containing carboxylic acid of 3-(3,5-dicarboxybenzyloxy)benzoic acid (H 3 L). Both MOFs had multifunctional fluorescence sensing and catalytic properties.…”

Two-Fold Interpenetrated Binuclear Nickel Metal–Organic Framework as a Heterogeneous Catalyst for N-Heterocycle Synthesis

“…The study of MOFs has been rapidly developed in the past decades due to not only the fascinating crystallography of MOFs − but also the potential applications in various fields including adsorption and separation, − catalyst, − and so on. Due to the advantages of adjustable channels, adjustable pore size, large specific surface area, low density, and good chemical stability, MOFs have been widely used as recyclable heterogeneous catalysts in various organic reactions. − Usually, when MOFs are used in catalysis, the active site of the catalysts are the metal centers of the MOFs, which can activate the substrates and lower the reaction energy barrier to allow the reaction to proceed smoothly. − Therefore, the selection of suitable metal ions is very important for the construction of MOF catalysts.…”

Accurate Matching of a Secondary Amino-Functionality Metal–Organic Cage for Selective Recognition and Supramolecular Binding during Photoinduced Hydrogen Evolution

“…It is very conducive to the interaction of guest molecules with oxygen-rich groups. Several previous studies have reported on porous materials that effectively capture less acidic carbon dioxide molecules or other saccharide molecules by the obvious hydrogen bonding interactions of the introduced multiamide groups. − However, a slight change in the configuration of active sites of the host or guest molecules might change the interactions and binding abilities between them and thus also affect the stability or the selectivity of the binding guests . As a consequence, accurate matching is highly required to construct a stable supramolecular system.…”

“…20−24 However, a slight change in the configuration of active sites of the host or guest molecules might change the interactions and binding abilities between them and thus also affect the stability or the selectivity of the binding guests. 25 consequence, accurate matching is highly required to construct a stable supramolecular system. Herein, by incorporating Co(II) ions as construction nodes and a flexible ligand TAP containing three functional amides and one secondary amino group as guest-interacting sites, we report an MOC (Co-TAP) with a pseudotetrahedral structure; the introduction of additional secondary amino groups in Co-TAP exhibits a strong selective recognition of uridine over other RNA nucleosides with similar size and structures via a fluorescent response.…”