A Cu₂I₂-Based Coordination Framework as the Selective Sensor for Ag⁺ and the Effective Adsorbent for I₂

Abstract

By using a N-containing tetradentate ligand tetra­(pyridine-4-yl)­benzene-1,4-diamine (TBD) as the coordination linker, a chemically stable metal–organic framework [Cu2I2(TBD)·DMF] n (1) has been successfully synthesized (DMF = N,N-dimethylformamide). Compound 1 features a three-dimensional architecture wherein the [Cu2I2] moieties are formed and further serve as the secondary building units to assist the fabrication of the final network. Solid-state photoluminescence behavior has been investigated on compound 1. Notably, the sensing experiments suggest that Ag+ exhibits a dramatic quenching effect on luminescence emission of 1, implying the great potential of the title compound as an Ag+ sensor. Related verification experiments have been conducted in detail. Moreover, compound 1 presents an effective I2 sorption performance, which could be further regarded as a promising adsorbent for the removal of targeted species.

Two isomeric metal–organic frameworks bearing stilbene moieties for highly volatile iodine uptake

“…[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] Recently, several MOFs have been reported as promising candidates for iodine adsorption. [26][27][28][29][30] Various approaches have been developed to enhance the I 2 adsorption performance of MOF materials; 31 however, rational design and fabrication of MOFs with excellent iodine adsorption still remain big challenges. One effective strategy is to introduce electron-pair donors including pyridine, R 2 O, ROH, RNH 2 , etc., or conjugated π-electron units into the frameworks to functionalize MOFs, which could form stable halogen bonds or charge-transfer (CT) complexes with I 2 , thereby increasing the adsorption capacity.…”

A Multifunctional Coordination Polymer Constructed by Viologen Derivatives: Photochromism, Chemochromism, and MnO4– Sensing

“…Coordination polymers (CPs), constructed by metal ions and organic ligands, are considered to be a promising class of hybrid materials because they integrate the merits of inorganic and organic materials. − In the past two decades, CPs feature determined crystal structures, tailorable compositions, and designable properties, thus providing wide application prospects in gas adsorption and separation, − catalysis, − energy conversion, , luminescence and sensing, − CO 2 capture and catalysis, − photochromism, , magnets − and so on. − Therefore, it is expected to obtain CPs with targeted structures and properties through the judicious choices and modifications of synthesis conditions, metal nodes, and organic linkers. However, multifunctional CPs combining a set of well-defined properties for specific applications are still rarely reported. − It remains quite challenging to fuse a variety of necessary properties into the backbone of a CP.…”

Construction of Cu(I)-Organic Frameworks with Effective Sorption Behavior for Iodine and Congo Red

“…Metal–organic frameworks (MOFs), fabricated from the infinite linkage of metal ions or clusters and organic ligands, are still research hotspots and continue to catch considerable attention. These functional hybrids are usually equipped with permanent porosities and present distinct physicochemical properties in sorption, separation, catalysis, photoluminescence, magnetism, and so on. − In the process of acquisition of desirable MOFs, many external factors have a great influence on the regulation of diverse architectures, among which the utilization of organic linkers could be considered as the most important one. − Especially, the N-donor molecules, exemplified by the pyridine and azole derivatives, are largely employed to assist the construction of promising MOFs by virtue of their merits in satisfactory coordination geometry and abilities. − According to the hard and soft (Lewis) acid and base theory, the “soft” N atom has a high affinity to the “soft” cation like Cu + , thus giving rise to a large number of robust Cu­(I)-based MOFs with outstanding physical performance. The works on Cu­(I) cyclic trinuclear complexes (CTCs) are representative of such compounds. − The combination of closed-shell coinage metal with angular ditopic anionic linkers such as pyrazolate and 1,2,4-triazolate has afforded a series of trinuclear metallocycles with M–M interactions featuring excellent photoluminescence behaviors.…”