摘要：A fluorescent aminoacid was designed for selective and sensitive detection of Cu(II) in aqueous solution. The designing of this Cu(II) fluorescent chemosensing molecule, N (1 naphthyl)~aminoacetic acid (NAA), was based on the binding of Cu(II) to aminoacetic acid and the novel charge transfer photophysics of 1 aminonaphthalenes. The fluorescence of NAA was found quenched by Cu(II) and several other metal ions of similar electronic structure such as Co(II), Ni(II) and Zn(II). The quenching was shown to occur via electron transfer within the metal NAA complex, which required an optimal combination of high binding affinity and favorable redox properties of the components in the metal NAA complex and hence afforded selective fluorometric detection of Cu(II). The calibration graph obeyed Stern Volmer theory and was shown for Cu(II) over the range of 0—2 75×10 -4 mol/L. The quenching constant of Cu(II) was measured as 8 0×10 3 mol/L that was two orders of magnitude higher than those of Co(II), Ni(II) and Zn(II). The 3SD limit of detection for Cu(II) was 8 00×10 -6 mol/L with a coefficient of variation of 1 65%. Linear range for quantitative detection of Cu(II) was 2 67×10 -5 —2 75×10 -4 mol/L. The method was applied to synthetic sample measurements which gave recoveries of 105%—112%.

摘要：Electrochemical CO_(2)reduction to value-added fuels and chemicals is recognized as a promising strategy to alleviate energy shortages and global warming owing to its high efficiency and economic ***,understanding the activity origin,selectivity regulation,and reaction mechanisms of CO_(2)reduction reactions(CO_(2)RRs)has become the focus of efficient electrocatalyst ***(POMs),a unique class of nanosized metal-oxo clusters,are promising candidates for the development of efficient CO_(2)RR electrocatalysts and,owing to their well-defined structure,remarkable electron/proton storage and transfer ability,and capacities for adsorption and activation of CO_(2),are ideal models for investigating the activity origin and reaction mechanisms of CO_(2)RR *** this review,we focus on the activity origin and mechanism of CO_(2)RRs and survey recent advances that were achieved by employing POMs in electrocatalytic CO_(2)*** highlight the significant roles of POMs in the electrocatalytic CO_(2)RR process and the main factors influencing selectivity regulation and catalytic CO_(2)RR performance,including the electrolyte,electron-transfer process,and surface ***,we offer a perspective of the advantages and future challenges of POM-based materials in electrocatalytic CO_(2)reduction that could inform new advancements in this promising research field.

摘要：Learning from nature photosynthesis,the development of efficient artificial catalysts for water oxidation is an ongoing ***,a lamellar cobalt oxide(CoO),black phosphorus(BP)and reduced graphene oxide(RGO)hybrid electrocatalyst is *** domains are anchored on RGO and coated with CoO via P–O *** widespread P–O bond network constitutes the proton acceptor and forms a proton exit channel,akin to the use of Asp61 in Photosystem II(PSII).The innermost kernel layer RGO serves as the current collector and forms an electron exit channel,mimicking the function of Tyr161 for charge *** outermost encapsulation CoO layer acts as water oxidation catalyst(WOC).These biology‐inspired features endow an outstanding OER performance of the hybrid material with a low overpotential of 206 mV at a current density of 10 mA cm^(-2).This work provides a new design guide for OER electrocatalysts through constructing two specialized channels for proton and electron transfer.

摘要：pH dependent uorescence emission of a thioxanthone-based probe has been re-ported *** potential deter-minant factors of pH dependence may provide important clues to design novel thioxanthone-based probes in the *** dependence of photochemical kinetics of thioxanthone itself was inves-tigated in this work using nanosecond time-resolved laser ash *** nanosecond time-resolved transient absorption spectra and kinetics of TX in aqueous acetonitrile were recorded,as well as for a model reaction system including TX with diphenylamine(DPA)as a *** the well-known absorption peak of ^(3)TX*,other peaks at 417,518,673 and 780 nm,have been reliably attributed to major intermediates in the overall reaction between TX and DPA with photolysis,which has been con rmed to occur along a multistep *** the strong acidic solution(pH≈3.0),TX and protonated TX ions(TXH^(+))coexist due to protonated ***,high proton concentration promotes the predominant decay pathway after photolysis from electron transfer to proton ***,the di erent primary products,^(3)TXH^(+*)or TX^(·-),proceed di erent secondary reaction *** addition,within the wide pH range from weak acid(pH=5.0)to alkaline solution(pH=13.0),the overall reaction mechanism and rates do not show visible changes.