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The reactions of ligand N'-[(pyridin-2-yl)methylene]pyrazine-2-carbohydrazide (ppcd) with different copper salts (1, acetate; 2, perchlorate; 3, sulfate) in MeOH could afford one acetate-bridge tetranuclear discrete [Cu2(ppcd)(ac)2(H2O)(OH)]2·H2O (1), one-dimensional (1D) chiral chain [Cu(ppcd)]ClO4 (2), and a 1D-decker complex of a trinuclear copper(II) subunit, Cu3(ppcd)2(H2O)4(SO4)2 (3). Single-crystal X-ray analysis revealed that conformation isomerism of the ppcd ligand was associated with the configuration of -N-N- (trans or cis) and could induce the versatile coordination mode in the presence of different anions. The 1D chiral chain was interestingly obtained from the achiral rigid ligand in complex 2. Magnetic studies indicated that the magnitude of the antiferromagnetic coupling can be tuned because of the configuration isomerism [compound 1 is practically diamagnetic at room temperature (J ≈ -1000 cm(-1)), with a strong antiferromagnetic one (J = -255.4 cm(-1)) for 2 in the 1D uniform chain and an antiferromagnetic one (J = -123.6 cm(-1)) for 3 within the trinuclear copper subunit].
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An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Two tests were designed to investigate activated carbon adsorbing gasoline vapor. In the inlet vapor-air mixture of the adsorption towers, the vapor volume fractions were 0.05 and 0.40, and the mixture flow were 40 m3/h and 65 m3/h respectively. The test results showed that their recovery rate were above 95％. A new integrated technology of absorption-adsorption for gasoline vapor recovery was developed. The recovery rate was up to 99.6％, and the outlet vapor volume fraction can be controlled below 0.0032. The integrated system will appear distinct comprehensive benefit.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Three lanthanide-thiophenedicarboxylate hybrid compounds, [(Eu2(TDC)3(CH3OH)2·(CH3OH)] (1), [(Yb2(TDC)3(DMF)(H2O)·(CH3CH2OH)] (2), and [(Tb2(TDC)3(H2O)4] (3) (where TDC is deprotonated thiophene-2,5-dicarboxylic acid and DMF is dimethylformamide), have been prepared by a hydrothermal method. The TDC ligands exhibit two unprecedented (κ2-κ1-μ2)−(κ1-κ1)−μ5 and (κ2)−(κ2)−μ2 coordination modes as well as other various modes. Structure analysis reveals that 2,5-thiophenedicarboxylic acid play a versatile role toward different lanthanide ions to form three-dimensional inorganic−organic hybrid frameworks. The luminescence experiments show that Eu(III) and Tb(III) compounds exhibit typical luminescence in the visible region, while the Yb(III) compound emits characteristic near-infrared luminescence in the solid state even with the coordinated water molecules. Besides luminescence, the Tb(III) compound also shows weak ferromagnetic behavior, which indicates that it is acting as a dual function material.
A novel blue-emitting Zn(II) MOF featuring parallel 2D+2D interpenetrated layers and tubelike channels was generated and shown to efficiently accommodate lanthanide(III) cations (Ln3+ = Eu3+, Tb3+, or a mixture of Eu3+/Tb3+), resulting in the Ln3+-encapsulated functional materials with a tunable emission color, including red, green, and nearly pure white light. Furthermore, the thermal-responsive luminescence was investigated for the lanthanide-codoped MOF to exhibit the chromic transition from white at room temperature to blue around liquid nitrogen temperature.
Abstract Structurally tunable small signaling molecules have been specifically designed to probe-free formaldehyde concentrations as low as 0.1 ppm, establishing the utility of probing the exposure limit for safe human consumption according to the guidelines suggested by W.H.O. The substrate, 2-aminobenzoylhydrazide, fluorescent core skeleton was designed for the construction of diverse quinazoline compounds with combinatorial substituent-pending potentials via rapid condensation reactions with aldehyde groups. After identifying the fluorescent species by 1H NMR and X-ray crystallography, we demonstrate that the fluorescent emission is substituent dependent and that, by simple structural variation, the fluorescence can be tunable through controlling internal charge transfer (ICT) within a dye platform. Finally, by introducing more electron-rich ferrocene into the substrate to further undermine the ICT process, we demonstrate highly sensitive formaldehyde sensing through dual signal output, including fluorescence and redox potential.
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