The post-synthetic modification of a Cd-MOF and its fluorescence sensing properties.

In this work, a three-dimensional metal-organic framework, [CdL(HO)] (Cd-MOF) was synthesized by using 2-(6-carboxypyridin-2-yl)terephthalic acid ligand (HL); and its post-synthetic modification composite, Eu@Cd-MOF was obtained by one-pot reaction of Euions with Cd-MOF. The FT-IR, PXRD, XPS, EDS, and fluorescence spectra were employed to verify the successful encapsulation of Euions into Cd-MOF. The luminescence measurements showed that Eu@Cd-MOF had a fluorescence quenching response with minocycline (MC), a widely used drug of broad-spectrum tetracycline antibiotics; and its limit of detection (LOD) for MC was 6.

An Eu Coordination Polymer: Its Single-Crystal Transformation Synthesis, Fluorescence Detection of Melamine, and Proton Conductivity.

In this work, an Eu coordination polymer () was synthesized by a single-crystal-to-single-crystal transformation based upon complex under the stimulation of water molecules ({[Eu(bpdc)(HO)]·4HO} (), {[Eu(bpdc)(HO)]·5HO} (), and Hbpdc = 2,2'-bipyridine-3,3'-dicarboxylic acid ligand). Complex exhibited considerable pH fluorescence stability in an aqueous solution. Notably, the experiment showed that complex achieved high selectivity and sensitivity for the detection of the notorious food additive melamine (MEL) through a significant fluorescence enhancement response; and yet complex had no fluorescent response with MEL.

Two Stable Bifunctional Zinc Metal-Organic Frameworks with Luminescence Detection of Antibiotics and Proton Conduction.

Functionalized crystalline solids based on metal-organic frameworks (MOFs) enable efficient luminescence detection and high proton conductivity, making them crucial in the realms of environmental monitoring and clean energy. Here, two structurally and functionally distinct zinc-based MOFs, [Zn(TTDPa)(bodca)]·HO () and [Zn(TTDPb)(bodca)]·HO (), were successfully designed and synthesized using 3,6-di(pyridin-4-yl)thieno[3,2-]thiophene (TTDPa) and 2,5-di(pyridin-4-yl)thieno[3,2-]thiophene (TTDPb) as ligands, in the presence of bicyclo[2.2.

Visible-Light-Promoted C(sp)-C(sp) Cross-Coupling of Amino Acids and Aryl Trifluoromethyl Ketones Through Simultaneous Decarboxylation and Defluorination.

A photoredox-catalyzed approach for the difluoroalkylation of amino acids was achieved through simultaneous decarboxylation and defluorination processes. This innovative protocol employs commonly available amino acids and trifluoroacetophenones as the primary starting materials, eliminating the necessity for preactivation. This strategy has enabled the synthesis of several difluoroketone functionalized amines in moderate to impressive yields.

Two-dimensional dysprosium(III) coordination polymer: Structure, single-molecule magnetic behavior, proton conduction, and luminescence.

A new dysprosium (III) coordination polymer [Dy(Hm-dobdc) (HO)]·HO (), was hydrothermal synthesized based on 4,6-dioxido-1,3-benzenedicarboxylate (Hm-dobdc) ligand containing carboxyl and phenolic hydroxyl groups. The Dy(III) center adopts an octa-coordinated [DyO] geometry, which can be described as a twisted square antiprism ( symmetry). Neighboring Dy(III) ions are interconnected by deprotonated Hm-dobdc ligand to form the two-dimensional infinite layers, which are further linked to generate three-dimensional structure through abundant hydrogen bonds mediated primarily by coordinated and lattice HO molecules.