Luminescent Anionic Metal–Organic Framework with Potential Nitrobenzene Sensing

Abstract

Solvothermal reaction of multidentate organic ligand, 5,5′,5″,5‴,5],5]′-[1,2,3,4,5,6-phenylhexamethoxyl]hexaisophthalic acid (H12L), with Cd(NO3)·4H2O produced an anionic 3D metal–organic framework [(CH3)2NH2]4[Cd3(H2L)] (1), which features a novel cage-to-cage connection. Interestingly, the 1D channel, which is stacked by cages, is divided into uniform segments by molecular-scale bricks. The luminescent properties of compound 1 have been explored, which shows that 1 is a potential luminescent sensory material for nitrobenzene.

A luminescent cadmium metal-organic framework with potential detection of nitroaromatic compounds

“…The emission peak of compound 1 containing Cd(II) occurs at 454 nm (λ ex ¼370 nm). According to the previous studies [16], the emission is neither metal-to-ligand charge transfer (MLCT) nor ligand-to-metal charge transfer (LMCT) in nature, which may originate from the intraligand fluorescent emissions of L ligand, because the similar emission peak of H 3 L is observed (λ em ¼457 nm, λ ex ¼325 nm).…”

“…S6). Therefore, the excited state electrons can transfer from MOF to NB, which leads to fluorescence quenching [16].…”

A Water‐Stable Lanthanide Coordination Polymer as Multicenter Platform for Ratiometric Luminescent Sensing Antibiotics

“…6 H 13/2 of the Dy ion, respectively. [22] It is reasonable to suggest partial ligand-to-metal energy transfer in Dy-TCPB. Figure S5 (the Supporting Information) shows the luminescence spectrum of Sm-TCPB.…”

Three Distinct Silver(I) Coordination Polymers: Bridging‐­Ligand Directed Syntheses, Crystal Structures, Luminescence, and Nitrobenzene Sensing Properties

“…The emission peaks of 1-3 are similar to the DMAP organic ligand, therefore their emissions may be due to the intraligand luminescent emission of the DMAP ligand. [28][29][30][31] Figure 10. Emission spectra of 1-3 in 2-propanol suspensions and DMAP in 2-propanol solution at room temperature (λ ex = 280 nm).…”