Five water-stable luminescent Cd^II-based metal–organic frameworks as sensors for highly sensitive and selective detection of acetylacetone, Fe³⁺ and Cr₂O₇²⁻ ions

Abstract

Five CdII-based MOFs with different topologies were prepared, in which 2 and 3 are rare examples which display excellent sensitivity, selectivity, recyclability and structural stability for detection of acac/Fe3+ and acac/Cr2O72−, respectively.

Water-Robust Zinc–Organic Framework with Mixed Nodes and Its Handy Mixed-Matrix Membrane for Highly Effective Luminescent Detection of Fe3+, CrO42–, and Cr2O72– in Aqueous Solution

“…The LOD values of this compound for Fe 3+ , CrO 4 2– , and Cr 2 O 7 2– are comparable to those reported previously, further confirming the potential application of compound 1 as a chemosensor toward these ions (Tables S3–S5). ,− …”

“…However, no overlap can be observed between the UV–vis absorption bands of other cations and the excitation spectrum of this luminescence sensor (Figure S17a). , Therefore, it is very likely that Fe 3+ can compete with this MOF for absorbing the excitation light. Therefore, the competitive absorption between Fe 3+ and compound 1 cut down the excitation efficiency, resulting in emission quenching.…”

Stable Cd Metal–Organic Framework as a Multiresponsive Luminescent Biosensor for Rapid, Accurate, and Recyclable Detection of Hippuric Acid, Nucleoside Phosphates, and Fe3+ in Urine and Serum

“…Crystal Structure. Single-crystal X-ray diffraction analysis shows that the complex 1 crystallizes in the monoclinic 38,39 As shown in Figure 1a, each L 2− ligand connects three Cd 2+ ions, and each Cd 2+ ion in turn is linked by three L 2− ligands, forming a 2D honeycomb layer with hexagonal windows. The adjacent layers are alternately linked by pillared bpbix ligands with two different conformations to afford a pillared-layer 3D framework structure with 1D parallelogram channels (13.6 × 7.7 Å 2 ) along the b axis (Figure 1b).…”

A stable Cd-MOF as a dual-responsive luminescent biosensor for the determination of urinary diphenyl phosphate and hippuric acid as biomarkers for human triphenyl phosphate and toluene poisoning

“…The Cd-O/N bond distances [2.263(4)-2.370(3) Å] are closer to those of the reported Cd-MOFs. 32,33 The carboxyl groups of the L 4− ligand adopt a μ 2 -η 1 :η 1 bridging mode and a μ 1 -η 1 :η 1 chelating mode to link six Cd 2+ ions (Fig. S2 †).…”