A Water Stable CdII -based Metal-Organic Framework as a Multifunctional Sensor for Selective Detection of Cu2+ and Cr2 O7 2- Ions

Solvo-thermal synthesis of a unique cluster-based nano-porous zinc(II) luminescent metal-organic framework for highly sensitive detection of anthrax biomarker and dichromate

In this work a flexible multi-dentate 4,4'-(1H-1,2,4-triazole-1-yl) methylene-bis(benzonic acid) (H₂L) ligand has been employed, a unique cluster-based nano-porous luminescent zinc(II) metal-organic framework {[Zn(μ₆-L)]·(DMAC)₂}_n (1) (DMAC = Dimethylacetamide) has been isolated under solvo-thermal conditions. The H₂L ligand adopts hexa-dentate coordination modes via one triazole nitrogen atom and four aromatic carboxylate oxygen atoms, which bridge the neighboring six-coordinated Zn^II centers, leading to a three-dimensional (3D) nano-porous metal organic framework. A PLATON program analysis suggests the total potential solvent area volume is 2028.9 Å³, which occupy 62.5% percent of the unit cell volume (3248.4 Å³). PXRD Patterns of the as-synthesized samples 1 have been determined confirming the purity of the bulky samples. Photo-luminescent properties indicate strong fluorescent emissions of 1 at the room temperature. Further photo-luminescent measurements show that 1 can exhibit highly sensitive real-time luminescence sensing of anthrax biomarker dipicolinic acid (DPA) with high quenching efficiency (K_SV = 1.48 × 10⁵ M^-1) and low detection limit (0.298 μM (S/N = 3)). Meanwhile 1 also exhibits highly selective and sensitive luminescence sensing for Cr₂O₇^2- ions in aqueous solutions with high quenching efficiency K_SV = 1.22 × 10⁴ L·mol^-1 and low detection limit (0.023 μM (S/N = 3)). Therefore 1 can be used a unique multi-functional 3D cluster-based metal organic material in sensitive detection and effective detection of environment pollutants and biomarker molecules.

A Fluorescent Zn(II)-Coordination Polymer: Selective Detection of Nitrofurantoin and Prevention of Peri-Implantitis after Ultrafine-Grained Titanium Implant by Reducing Inflammatory Cytokines Release

In the current research, a novel coordination polymer (CP) containing Zn(II) ions as nodes with the chemical formula of [Zn(IPT)₂]_n (1) has been produced via reaction of Zn(NO₃)₂·6H₂O with 5-(3-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT), a heterotopic imidazole-tetrazole-bifunctional ligand. The as-prepared complex 1 has been charactered via single crystal X-ray diffraction, elemental analysis, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and fourier transform infrared spectroscopy (FT-IR). Because of its outstanding luminescent performances and stability, the synthesized complex 1 is a kind of excellent material of luminescent sensor of nitrofurantoin (NFT) in the water. The value of K_sv for the complex 1 to NFT is about 1.4 × 10⁴ M^-1. For the treatment of the peri-implantitis with complex 1, the ELISA test was carried out to determine the levels of the inflammatory cytokines released into the gingival crevicular fluid. The results showed that the levels of the inflammatory cytokines could be significantly reduced by complex 1 treatment. In addition to this, the real time RT-PCR was also conducted, and the data suggested the signaling pathway of TLR-4-NF-κB activation was inhibited by complex 1.

Antibacterial and aqueous dual-responsive sensing activities of monomeric complexes with uncoordinated imidazole sites

The butterfly-shaped monomeric complex is stable and slight soluble in water, which shows antibacterial and aqueous dual-responsive sensing activities.