Stable Co(II)-based coordination polymer as fluorescence sensor for the discriminative sensing of biomarker methylmalonic acid.

Three novel Co-based coordination polymers including {[Co(L)(μ-O)]} (1), {[Co(L)(bimb)]} (2) and {[Co(L)(bimmb)]} (3) (HL = 2,6-di(4-carboxylphenyl)-4-(4-(triazol-1-ylphenyl))pyridine), bimb = 1,4-bis(lmidazol) butane, bimmb = 1,4-bis(imidazole-1-ylmethyl)benzene) were successfully prepared under solvothermal conditions and characterized. Single-crystal X-ray diffraction analyses revealed that 1 possesses a 3D architecture composed of a trinuclear cluster [CoN(CO)(μ-O)], 2 exhibits a 2D new topological framework with the point symbol (8·12)(8), whereas 3 shows a unique six-fold interpenetrated 3D framework with a (6·8·10)(6)(8) topology. Impressively, all of them can function as a highly selective and sensitive fluorescent sensor for the biomarker methylmalonic acid (MMA) via fluorescence quenching.

Three-Dimensional Cadmium-Organic Framework with Dual Functions of Oxygen Evolution in Water Splitting and Fenton-like Photocatalytic Removal of Organic Pollutants.

Metal-organic frameworks (MOFs) have exhibited appreciable potential as catalytic agents in the field of material science. The research of new MOFs with dual functions in electrocatalysis and photocatalysis under ultraviolet (UV) irradiation is extremely pivotal for renewable energy applications. Hence, we synthesized a series of three-dimensional MOFs, namely, [Cd(bimb)(HITA)] (-), {[Cd(bimb)](NO)} (-), and [Cd(bimb)(ONO)] (-) (bimb = 1,4-bis(imidazol-1-ylmethyl)benzene; HITA = 5-hydroxyisophthalic acid), with applicability in the oxygen evolution reaction process and Fenton-like photocatalysis.

One-step synthesis of a carbon dot-based fluorescent probe for colorimetric and ratiometric sensing of tetracycline.

Carbon dots (CDs) with blue fluorescence were synthesized using indole-3-butyric acid and l-tryptophan using a one-step hydrothermal method. The CDs were further employed as a fluorescent sensor with high selectivity for colorimetric and ratiometric detection of tetracycline (TC) in water. The limit of detection (LOD) was found to be 0.

Zn-MOFs based luminescent sensors for selective and highly sensitive detection of Fe and tetracycline antibiotic.

Either reduced or excessive metal ions level in biological systems might induce serious metabolic diseases, and the abuse of antibiotics has seriously affected the environment. Despite the significant progress in the development of fluorescence probes over the past decade, the ability to sensitively and selectively detect these metal ions and antibiotics remains a pressing problem. Herein, we demonstrated some effective fluorescence probes for sensing metal ions and antibiotics, six novel and stable Zn(II) metal-organic frameworks (Zn-MOFs), namely [Zn(L)(1,4-bimb)] (1), [Zn(L)(4,4'-bbibp)(HO)]·2(CHCN) (2), [Zn(HL)(4,4'-bidpe)] (3), [Zn(HL)(4,4'-bibp)] (4), [Zn(HL)(3,5'-bip)] (5) and [Zn(HL)(1,3'-bit)] (6) (flexible HL = 5-(2-carboxylphenoxy)isophthalic acid, semi-flexible 1,4-bimb = 1,4-bis(imidazol-l-ylmethyl) benzene, rigid 4,4'-bbibp = 4,4'-bis(benzoimidazo-1-ly)biphenyl, semi-flexible 4,4'-bidpe = 4,4'-bis(imidazolyl)diphenyl ether, rigid 4,4'-bibp = 4,4'-bis(imidazolyl)biphenyl, rigid 3,5'-bip = bis(1-imidazoly)pyridine and rigid 1,3-bit = 1,3-bis(l-imidazoly)toluene) have been successfully synthesized via solvothermal conditions and further characterized by IR spectra, elemental analysis, powder X-ray diffraction (PXRD), single-crystal X-ray diffraction, and thermogravimetric (TG) analysis.

Urease inhibition studies of six Ni(II), Co(II) and Cu(II) complexes with two sexidentate NO-donor bis-Schiff base ligands: An experimental and DFT computational study.

Six novel complexes, [Ni(CHNO)]·2.25CHOH·0.5CHO (1), [Co(CHNO)] (2), [Cu(CHNO)]·2CHOH (3), [Ni(CHNOCl)]·2CHOH (4), [Co(CHNOCl)]·4CHOH (5) and [Cu(CHNOCl)]·2CHOH (6) with two sexidentate NO-donor bis-Schiff base ligands (CHNO = 1,2-bis(2-methoxy-6-formylphenoxy)ethane-l-tyrosine; CHNOCl = 1,2-bis(2-methoxy-6-formylphenoxy)ethane-l-4-chlorophenylalanine) have been synthesized and structurally characterized.