A new energetic dipotassium 3,3-dinitro-5,5-bis-1,2,4-triazole-1,1-diolate [K2（DNOBT）] was synthesized, and structurally characterized by elemental analysis, IR spectra, 13 C NMR and single-crystal X-ray diffraction...A new energetic dipotassium 3,3-dinitro-5,5-bis-1,2,4-triazole-1,1-diolate [K2（DNOBT）] was synthesized, and structurally characterized by elemental analysis, IR spectra, 13 C NMR and single-crystal X-ray diffraction. K2（DNOBT）·2H2O crystallizes in monoclinic system, space group P21/n with a=6.0446（10）, b=15.999（3）, c=6.4169（11） , β=99.421（2）°, V=612.21（18） 3, Z=4, Dc=2.009 g·cm（-3）, F（000）=372, μ=0.838 mm（-1）, S=1.012, the final R=0.0248 and w R（I 〉 2σ（I））=0.0604. Thermal decomposition of the title compound was studied by using DSC and TG-DTG, and there is primarily one exothermic decomposition process at 371.5 ℃.展开更多
Nickel molybdate(NiMoO4)nanoparticles(NPs)were synthesized by sol-gel method.Utilizing water as solvent providescrystalline nanostructures.These nanocrystals were structurally characterized by X-ray diffraction,energy...Nickel molybdate(NiMoO4)nanoparticles(NPs)were synthesized by sol-gel method.Utilizing water as solvent providescrystalline nanostructures.These nanocrystals were structurally characterized by X-ray diffraction,energy dispersive X-ray analysis(EDX),and Fourier transform infrared spectra.Compositional stoichiometry was confirmed by EDX technique.The size and shapewere observed by scanning electron microscopy(SEM)and transmission electron microscope(TEM).It was found that the obtainedNPs were pure and single phase crystalline with monoclinic structure.The optical properties were studied by ultraviolet-visiblediffuse reflectance spectroscopy(UV-Vis-DRS)and photoluminescence(PL)measurements at room temperature.The magneticproperties were studied by vibrating sample magnetometer(VSM)and results showed superparamagnetic behavior of the obtainednanoparticles.Photocatalytic activity of NiMoO4was studied.The photocatalytic activity of NiMoO4was enhanced with the additionof TiO2.The catalysts NiMoO4,TiO2and NiMoO4-TiO2nanocomposites(NC)were tested for photocatalytic degradation(PCD)of4-chlorophenol(4-CP).It was found that PCD efficiency of NiMoO4-TiO2NC was higher than that of pure NiMoO4and TiO2.展开更多
In the present study,two-dimensional(2D)WO_(3)nanosheet arrays with(101)preferential orientation facets(WO_(3)NSHs)were successfully assembled on a fluorine-doped tin oxide(FTO)electrode through a simple solvothermal ...In the present study,two-dimensional(2D)WO_(3)nanosheet arrays with(101)preferential orientation facets(WO_(3)NSHs)were successfully assembled on a fluorine-doped tin oxide(FTO)electrode through a simple solvothermal method.Physicochemical properties analysis affirmed the prepared WO_(3)was a singlecrystal-like monoclinic nanosheet with an anomalous intense[101]dominant orientation.As an electrochromic supercapacitor(ESC)cathode electrode,the WO_(3)NSHs/FTO electrode delivered a high areal capacity of 59.55 mF cm^(−2)and corresponding transmittance modulation(ΔT)of 85.05%(at 1000 nm)at 5 mV s^(−1),and remarkable optical-electrochemical cycling stability in AlCl_(3)electrolyte.The superior optical-electrochemical bifunctional performance could be attributed to the synergistic effect of the WO_(3)nanosheet arrays structure and highly preferential(101)crystal facets.Furthermore,the internal mechanism affecting the optical-electrochemical performance,namely the synergistic reaction between the single-phase reaction for Al^(3+)ions insertion/extraction into monoclinic WO_(3)tunnels and the surface pseudocapacitance-controlled reaction,was confirmed by utilizing in situ X-ray diffraction.Similarly,the ESC device based on the WO_(3)NSHs/FTO electrode also displayed excellent optical-electrochemical performance in AlCl_(3)electrolyte,such as 26.11 mF cm^(−2)areal capacitance,42.39%ΔT(at 650 nm),and 94.87%capacitance retention after 5000 cycles.In addition,we could judge the capacity for the ESC device by the color changes.展开更多
A newly synthesized photomagnet based on a cyanido-bridged Co-W assembly,[{Co(isoquinoline)_(4)}_(3){W(CN)_(8)}_(2)]·_(2)EtOH(CoWisoq),exhibits a controllable photoinduced(PI)phase with a metamagnetic behavior.Th...A newly synthesized photomagnet based on a cyanido-bridged Co-W assembly,[{Co(isoquinoline)_(4)}_(3){W(CN)_(8)}_(2)]·_(2)EtOH(CoWisoq),exhibits a controllable photoinduced(PI)phase with a metamagnetic behavior.The PI phase shows a transition from paramagnetic to ferromagnetic with a coercive field of 550 Oe at 2 K.It has a monoclinic(P21/n)crystal structure and is comprised of two-dimensional cyanido-bridged Co-W coordination layers with two crystallographically independent Co sites(Co1,Co2)and one W site.Both Co sites adopt a pseudo-octahedral six-coordinated geometry involving four isoquinoline and two cyanide ligands.π-πinteractions are induced at half of the isoquinoline ligands in Co1 and all of those in Co2 sites,suggesting that the coordination environment at the Co1 site has structural flexibility.CoWisoq displays a thermal phase transition around 140 K with a small thermal hysteresis due to the charge transfer-induced spin transition between Co^(Ⅱ)-W^(Ⅴ) of the high temperature(HT)phase and Co ^(Ⅲ)-W^(Ⅳ) of the low temperature(LT)phase.This charge transfer,which is also responsible for a drastic color change between purple(HT)and yellow(LT),involves only the structurally flexible Co1 sites.The ligand field,which is composed of four isoquinoline and two cyanide ligands,contributes to a unique metal-to-metal charge transfer absorption band of the LT phase at 1025 nm.Irradiation of the LT phase with near-infrared light produces a PI phase with the CoII-WV state.展开更多
基金Financially supported by the National Natural Science Foundation of China(No.21373157)
文摘A new energetic dipotassium 3,3-dinitro-5,5-bis-1,2,4-triazole-1,1-diolate [K2（DNOBT）] was synthesized, and structurally characterized by elemental analysis, IR spectra, 13 C NMR and single-crystal X-ray diffraction. K2（DNOBT）·2H2O crystallizes in monoclinic system, space group P21/n with a=6.0446（10）, b=15.999（3）, c=6.4169（11） , β=99.421（2）°, V=612.21（18） 3, Z=4, Dc=2.009 g·cm（-3）, F（000）=372, μ=0.838 mm（-1）, S=1.012, the final R=0.0248 and w R（I 〉 2σ（I））=0.0604. Thermal decomposition of the title compound was studied by using DSC and TG-DTG, and there is primarily one exothermic decomposition process at 371.5 ℃.
基金support from the Caplin Point Laboratories Limited,Chennai,India
文摘Nickel molybdate(NiMoO4)nanoparticles(NPs)were synthesized by sol-gel method.Utilizing water as solvent providescrystalline nanostructures.These nanocrystals were structurally characterized by X-ray diffraction,energy dispersive X-ray analysis(EDX),and Fourier transform infrared spectra.Compositional stoichiometry was confirmed by EDX technique.The size and shapewere observed by scanning electron microscopy(SEM)and transmission electron microscope(TEM).It was found that the obtainedNPs were pure and single phase crystalline with monoclinic structure.The optical properties were studied by ultraviolet-visiblediffuse reflectance spectroscopy(UV-Vis-DRS)and photoluminescence(PL)measurements at room temperature.The magneticproperties were studied by vibrating sample magnetometer(VSM)and results showed superparamagnetic behavior of the obtainednanoparticles.Photocatalytic activity of NiMoO4was studied.The photocatalytic activity of NiMoO4was enhanced with the additionof TiO2.The catalysts NiMoO4,TiO2and NiMoO4-TiO2nanocomposites(NC)were tested for photocatalytic degradation(PCD)of4-chlorophenol(4-CP).It was found that PCD efficiency of NiMoO4-TiO2NC was higher than that of pure NiMoO4and TiO2.
基金National Key Research&Development Program(2016YFB0303903,2016YFE0201600)Foundation of Equipment Development Department(6220914010901)the Fundamental Research Funds for the Central Universities(Grant No.HIT.OCEF.2021004,FRFCU5710090220).
文摘In the present study,two-dimensional(2D)WO_(3)nanosheet arrays with(101)preferential orientation facets(WO_(3)NSHs)were successfully assembled on a fluorine-doped tin oxide(FTO)electrode through a simple solvothermal method.Physicochemical properties analysis affirmed the prepared WO_(3)was a singlecrystal-like monoclinic nanosheet with an anomalous intense[101]dominant orientation.As an electrochromic supercapacitor(ESC)cathode electrode,the WO_(3)NSHs/FTO electrode delivered a high areal capacity of 59.55 mF cm^(−2)and corresponding transmittance modulation(ΔT)of 85.05%(at 1000 nm)at 5 mV s^(−1),and remarkable optical-electrochemical cycling stability in AlCl_(3)electrolyte.The superior optical-electrochemical bifunctional performance could be attributed to the synergistic effect of the WO_(3)nanosheet arrays structure and highly preferential(101)crystal facets.Furthermore,the internal mechanism affecting the optical-electrochemical performance,namely the synergistic reaction between the single-phase reaction for Al^(3+)ions insertion/extraction into monoclinic WO_(3)tunnels and the surface pseudocapacitance-controlled reaction,was confirmed by utilizing in situ X-ray diffraction.Similarly,the ESC device based on the WO_(3)NSHs/FTO electrode also displayed excellent optical-electrochemical performance in AlCl_(3)electrolyte,such as 26.11 mF cm^(−2)areal capacitance,42.39%ΔT(at 650 nm),and 94.87%capacitance retention after 5000 cycles.In addition,we could judge the capacity for the ESC device by the color changes.
基金supported in part by a Grant-in-Aid for Scientific Research(A)from JSPS KAKENHI(Grant Number 20H00369)Advanced Technologies for Carbon-Neutral(ALCA)-Next from JST(JPMJAN23A2)+2 种基金CNRS-University of Tokyo“Excellence Science”Joint Research Program,Second CNRS–University of Tokyo PhD Joint Program.The Cryogenic Research Center,The University of Tokyo,the Center for Nano Lithography&Analysis,The University of Tokyo,Quantum Leap Flagship Program(Q-LEAP,Grant Number JPMXS0118068681)by MEXT is also acknowledged for supportKazuki Nakamura was supported by the World-Leading Innovative Graduate Study Program for Materials Research,Information,and Technology(MERIT-WINGS)the Fellowship for Integrated Materials Science and Career Development.Koji Nakabayashi acknowledges the Iketani Science and Technology Foundation(Grant Number 0351111-A).
文摘A newly synthesized photomagnet based on a cyanido-bridged Co-W assembly,[{Co(isoquinoline)_(4)}_(3){W(CN)_(8)}_(2)]·_(2)EtOH(CoWisoq),exhibits a controllable photoinduced(PI)phase with a metamagnetic behavior.The PI phase shows a transition from paramagnetic to ferromagnetic with a coercive field of 550 Oe at 2 K.It has a monoclinic(P21/n)crystal structure and is comprised of two-dimensional cyanido-bridged Co-W coordination layers with two crystallographically independent Co sites(Co1,Co2)and one W site.Both Co sites adopt a pseudo-octahedral six-coordinated geometry involving four isoquinoline and two cyanide ligands.π-πinteractions are induced at half of the isoquinoline ligands in Co1 and all of those in Co2 sites,suggesting that the coordination environment at the Co1 site has structural flexibility.CoWisoq displays a thermal phase transition around 140 K with a small thermal hysteresis due to the charge transfer-induced spin transition between Co^(Ⅱ)-W^(Ⅴ) of the high temperature(HT)phase and Co ^(Ⅲ)-W^(Ⅳ) of the low temperature(LT)phase.This charge transfer,which is also responsible for a drastic color change between purple(HT)and yellow(LT),involves only the structurally flexible Co1 sites.The ligand field,which is composed of four isoquinoline and two cyanide ligands,contributes to a unique metal-to-metal charge transfer absorption band of the LT phase at 1025 nm.Irradiation of the LT phase with near-infrared light produces a PI phase with the CoII-WV state.
