Abstract
Metal-Organic Frameworks (MOFs) as a class of crystalline materials are constructed using metal nodes and organic spacers. Polydentate N-donor ligands play a mainstay-type role in the construction of metal−organic frameworks, especially cationic MOFs. Highly stable cationic MOFs with high porosity and open channels exhibit distinct advantages, they can act as a powerful ion exchange platform for the capture of toxic heavy-metal oxoanions through a Single-Crystal to Single-Crystal (SC-SC) pattern. Porous luminescent MOFs can act as nano-sized containers to encapsulate guest emitters and construct multi-emitter materials for chemical sensing. This feature article reviews the synthesis and application of porous Metal-Organic Frameworks based on tridentate ligand tris (4-(1H-imidazol-1-yl) phenyl) amine (TIPA) and focuses on design strategies for the synthesis of TIPA-dominated Metal-Organic Frameworks with high porosity and stability. The design strategies are integrated into four types: small organic molecule as auxiliaries, inorganic oxyanion as auxiliaries, small organic molecule as secondary linkers, and metal clusters as nodes. The applications of ratiometric sensing, the adsorption of oxyanions contaminants from water, and small molecule gas storage are summarized. We hope to provide experience and inspiration in the design and construction of highly porous MOFs base on polydentate N-donor ligands.
Highlights
Luminescent Metal-Organic Frameworks (LMOFs), a subclass of MOFs, are promising light-harvesting and energy transfer platforms that have been widely explored in single-phased white-light emission, optical sensors, photocatalysis, and anticounterfeiting applications [10,11,12,13,14,15,16,17,18]
Until 2014, we explored a new way to promote crystal coordination chemistry of tris (4-(1H-imidazol-1-yl) phenyl) amine (TIPA), we tried to synthesize cationic porous MOFs only using TIPA molecules as linkers, without the assistance of carboxylate ligands [60]
When we prepared a MOF consisting of TIPA and int, we tried to synthesize a new MOF by replacing int with L‐proline, because L‐proline is a chiral molecule and has a similar size to int
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Making full use of the encapsulation of organic luminophores and dyes, multiple emission host-guest systems can be prepared, which is crucial to achieve a tunable emission that contributes to ratiometric fluorescence sensing. Exceptional ion-exchange platforms for the capture of toxic oxoanions and dyes. TIPA, asaddition, a relatively longasand semi-rigid star-like structure, star‐like structure, more meets the geometric requirements of these metalfacts, ions.porous. We introduce some applications of highly porous frameworks, such the capture of toxic oxoanions, luminescent detection, and the adsorption and separation as the capture of toxic oxoanions, luminescent detection, and the adsorption and of small-molecule gases. We highlight the advantage of TIPA-based MOFs as separation of small‐molecule gases. Single-Crystal containers for the encapsulation of toxic oxoanions and small molecule dyes based MOFs as Single‐Crystal containers for the encapsulation of toxic oxoanions and using the SC-SC pattern. In this field and the still‐existing challenges are discussed
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