Hansson Randrup (waterbutton0)

Herein, a fluorescence "turn ON-OFF" switch model PB@EuW10/SiO2 core@shell composite is designed and fabricated by coating EuW10-containing silica layer on Prussian blue (PB) nanoparticles via a facile method. It is found that the presence of PB can quench the photoluminescence of the composite which arises from EuW10. When hydrazine is mixed with the composite dispersion, PB can be reduced to Prussian white (PW), resulting in the decrease of UV absorption and the appearance of photoluminescence (turn ON). In addition, PW can also be converted back to PB, which is achieved by adding hydrogen peroxide, and the photoluminescence of the composite is quenched again (turn OFF). Thus, the composite is applied for N2H4 and H2O2 detection by fluorescence spectroscopy and UV-vis absorption spectroscopy. Wide linear ranges for N2H4 and H2O2 detection with low detection limits are found for both detection methods on the PB@EuW10/SiO2 core@shell composite. Besides, the color from light blue to colorless of the detection dispersion can also indicate the turn ON-OFF switch for fluorescence. Furthermore, the proposed model can also be extended to other composites.The highly efficient CO2 electrolysis system could be accomplished by introducing biomass oxidation as an alternative anodic reaction to the sluggish oxygen evolution reaction (OER) in CO2-saturated and near-neutral electrolyte. Here, we successfully demonstrate anodic biomass oxidation by synthesizing 5 nm-sized nickel oxide nanoparticles (NiO NPs). NiO NPs show a unique electrocatalytic activity for 5-hydroxymethylfurfural (HMF) oxidation under near-neutral condition, exhibiting an anodic current onset (1 mA cm-2) at 1.524 V vs RHE and total Faradaic efficiency up to 70%. Electrokinetic and in situ UV-Vis spectroscopic analyses suggest that redox active nickel hydroxide species is formed on the surface of NiO electrocatalysts during HMF oxidation, and this Ni(II) hydroxide oxidation to Ni(III) oxyhydroxide step could be the rate determining step (RDS). This mechanistic study for biomass oxidation in CO2-saturated electrolyte provides insight into constructing a highly efficient system for the paired electrolysis of CO2 reduction and biomass oxidation.The three-component reactions of α-amino acids, p-quinone monoacetals (or p-quinol ethers), and diarylphosphine oxides have been developed for the synthesis of 3-(diarylphosphinyl) anilides and N-aryl-2-diarylphosphinylpyrrolidines. The transformations may involve the in situ generation of conjugated azomethine ylides or 2-azaallyl anion species from the reaction of α-amino acids and p-quinone monoacetals, which are further trapped by diarylphosphine oxides.The spatial magnetic properties, through-space NMR shieldings (TSNMRS), of bent allene 1, the corresponding C-extended 1,3-butadiene derivative 2, and a number of related compounds 3-20 have been calculated using the gauge-independent atomic orbital perturbation method, employing the nucleus-independent chemical shift concept and visualized as isochemical shielding surfaces of various sizes and directions. Prior to that, both structures and 13C chemical shifts were calculated and compared with available experimental bond lengths and δ(13C)/ppm values (also, as a quality criterion for the computed structures). Bond lengths, the δ(13C)/ppm, and the TSNMRS values are employed to qualify and quantify the electronic structure of the studied compounds in terms of dative or classical electron-sharing bonds.During the decompression of plastically deformed glasses at room temperature, some aspects of irreversible densification may be preserved. This densification has been attributed primarily to topological changes in the glass networks. The changes in short-range structures like cation coordination numbers are often assumed to be relaxed upon decompression. Here, the NMR results for aluminosilicate glass upon permanent densification u