2-Fold Interpenetrating Bifunctional Cd-Metal–Organic Frameworks: Highly Selective Adsorption for CO₂ and Sensitive Luminescent Sensing of Nitro Aromatic 2,4,6-Trinitrophenol

Abstract

A robust primitive diamond-type topology 3-D metal-organic framework (MOF) of {[Cd(hbhdpy)(bdc)(DMA)]·(HO)} (1, DMA = N,N-dimethylacetamide) was constructed from the planar secondary building units of the dinuclear cadmium clusters, Cd(μ-O), and two linear organic linkers of the new multidentate Schiff base of 4-(2-hydroxy-3-methoxy-benzyli-denehydrazino-carbonyl)-N-pyridin-4-yl-benzamide (Hhbhdpy) through the solvothermal reaction. 1 presents a 2-fold interpenetrating network along with confined narrow channels and rich acylamide groups as well as potential metal open sites for excellent selective CO uptake over CH/N and high luminescent response for 2,4,6-trinitrophenol (TNP) in DMA solution under ambient conditions. With 2-amino-1,4-dicarboxy-benzene (Hbdc-NH) replacing Hbdc, an amine-functionalized MOF of {[Cd(hbhdpy)(bdc-NH) (DMA)]·(HO)} (1-NH) as an isomorphism of 1, was synthesized under the same reaction conditions. Compared with 1, the corresponding bifunctional features of 1-NH is more obvious. To the best of our knowledge, it is the first reported interpenetrating Cd-MOFs with highly sensitive luminescence response for TNP molecules combined with excellent selectivity for CO/N and CO/CH.

A Multifunctional 3D Supermolecular Co Coordination Polymer With Potential for CO2 Adsorption, Antibacterial Activity, and Selective Sensing of Fe3+/Cr3+ Ions and TNP

“…The PXRD pattern of compound 1a remained stable after the adsorption of N 2 and CO 2 (Supplementary Figure S11). Considering the adsorption isotherm at 298 K, the observed CO 2 adsorption capacity of 1a is better than the metal-organic frameworks including [Zn(BPTC) 0.5 (Tz) (Hong et al, 2017;Kong et al, 2018;Yao et al, 2018;Zhou et al, 2018;Liu et al, 2019). The adsorption isotherms show typical type-I sorption isotherm with fast kinetics and good reversibility, further indicating its microporosity.…”

Synthesis, structure, fluorescence, electrochemical, and antioxidant studies of a new silver(I) complex with 2,6-bis(N-methylbenzimidazol-2-yl)pyridine

“…Our previous research indicated that the presence of π•••π conjugation between benzimidazoles in complexes can cause partial fluorescence quenching. [39][40][41] In this work, this is the first time that we have found that the π•••π conjugation leads to complete quenching of fluorescence, 42,43 which may be related to picric acid that is often used as a fluorescence quenching reagent. The observations provide evidence for the fluorescence quenching mechanism of picrate.…”

Different Benzendicarboxylate-Directed Structural Variations and Properties of Four New Porous Cd(II)-Pyridyl-Triazole Coordination Polymers

“…Due to the great luminescent performances of the Hmdpt linker and d 10 complexes (Chou et al, 2014;Kumar et al, 2014;Hu et al, 2015;Ye et al, 2015;Wang et al, 2016;Hong et al, 2017;Lim et al, 2017), the solid-state photoluminescence properties have been studied for the four complexes and Hmdpt as well as the various auxiliary benzendicarboxylates at room temperature (Figure 11 and Supplementary Figure 13), the emissions of which are given in Supplementary Table 2. The free Hmdpt shows the band at 472 nm when excited at 307 nm, attributing to the π * → π transition of the intra-ligand (Lin et al, 2017).…”

“…The coordination polymers (CPs) have gained considerable research interest by the self-assembly of various organic linkers (including different functional groups) with metal ions/clusters due to their special topological nets and broad applications (Wang et al, 2014Smith et al, 2015;Dey et al, 2017;Hong et al, 2017;Islamoglu et al, 2017;Kariem et al, 2017;Lin et al, 2017;Li et al, 2018;Xing and Janiak, 2020;Zhang et al, 2020). Generally, the coordination preference of the nature of ligands and geometries of ions are the primary considerations in the preparation process of CPs.…”