One-Pot Hydrothermal Method Preparation of Cerium-Nitrogen-Codoped Carbon Quantum Dots from Waste Longan Nucleus as a Fluorescent Sensor for Sensing Drug Rifampicin.

Currently, the large-scale application of carbon quantum dots (CQDs) is usually limited by their low quantum yield and detection limit. Herein, the abandoned longan nucleus was used as a carbon source to synthesize cerium-nitrogen-codoped carbon quantum dots (Ce/N-CQDs) with strong luminescence intensity. In this work, the fluorescent properties and fluorescent quantum yield of CQDs may be improved by the single cerium-doped carbon quantum dots (Ce-CQDs) and the single nitrogen-doped carbon quantum dots (N-CQDs).

Five Mesoporous Lanthanide Metal-Organic Frameworks: Syntheses, Structures, and Fluorescence Sensing of Fe, CrO, and HO and Electrochemical Sensing of Trinitrophenol.

When a multicarboxylate aromatic ligand, 3,5-di(2',4'-dicarboxylphenyl)benzoic acid (HL), was employed, five structurally similar lanthanide metal-organic frameworks (Ln-MOFs), {[PrL(OH)Cl(HO)]·4CHN} (), {[NdL(OH) (HO)]·4CHN} (), {[GdL(OH)(HO)]·4CHN} (), {[HoL(OH) (HO)]·4CHN} () and {[ErL(OH)(HO)]·4CHN} (), were synthesized and characterized. Single-crystal X-ray structural analyses disclosed that all five Ln-MOFs crystallize in the trigonal space group. They have three-dimensional mesoporous structure featuring the coexistence of binuclear and tetranuclear species as inorganic building units.

Novel Multifunctional Samarium-Organic Framework for Fluorescence Sensing of Ag, MnO , and Cimetidine and Electrochemical Sensing of -Nitrophenol in Aqueous Solutions.

A novel Sm-metal-organic framework (MOF) sensor with the molecular formula Sm(HDBA)·HO has been prepared based on a penta-carboxyl organic ligand (HDBA = 3,5-di(2',4'-dicarboxylphenyl)benzoic acid) and samarium nitrate under solvothermal conditions. Sm-MOF is characterized by single-crystal X-ray diffraction analysis, elemental analysis, thermogravimetric analysis, and powder X-ray diffraction analysis. Structural analysis shows that the dimer metal units are alternately connected to form a one-dimensional chain, and this chain is connected by the bridging carboxyl oxygen of the ligand HDBA to form a two-dimensional double-layer plane, which then expands into a three-dimensional microporous framework.

A Multifunctional Tb-MOF Detector for HO, Fe, CrO , and TPA Explosive Featuring Coexistence of Binuclear and Tetranuclear Clusters.

A novel three-dimensional microporous terbium(III) metal-organic framework (Tb-MOF) named as [Tb (DBA)(OH)(HO)]·(HO) (), was successfully obtained by a solvothermal method based on terbium nitrate and 5-di(2',4'-dicarboxylphenyl) benzoic acid (HDBA). The Tb-MOF has been characterized by single crystal X-ray diffraction, elemental analysis, thermogravimetry, and fluorescence properties, and the purity was further confirmed by powder X-ray diffraction (PXRD) analysis. Structural analysis shows that there are two kinds of metal cluster species: binuclear and tetranuclear, which are linked by HDBA ligands in two μ high coordination fashions into a three-dimensional microporous framework.

Water-assisted isomerization of the [H, C, N, O] system.

Ten minima of [H, C, N, O] isomers were investigated in gas phase and water solution using the polarizable continuum model at the CCSD(T)//M06-2X/6-311 + G(3df,2p) level of theory. The results show that the stability order of all isomers in water solution is HNCO > HOCN > HCNO > HONC > Y-OC(H)N > cycl-OCN(H)-a ≈ cycl-OCN(H)-b > cycl-NCO(H) > HNOC > HCON, i.e.

μ-4,4'-Bipyridine-bis-[aqua-(4-hy-droxy-pyridine-2,6-dicarboxyl-ato)copper(II)].

The title compound, [Cu(2)(C(7)H(3)NO(5))(2)(C(10)H(8)N(2))(H(2)O)(2)], exhibits a centrosymmetric binuclear molecule. Each completely deprotonated 4-hy-droxy-pyridine-2,6-dicarb-oxy-lic acid mol-ecule assumes a tridentate chelating coordination mode. The square-pyramidal coordination geometry around the Cu(II) ion is completed by the bridging bipyridine ligand and an apical water molecule.