简介：Thethermalbehavior,mechanismandkineticparametersoftheexothermicfirst-stagedecompositionofthetitlecompoundinatemperature-programmedmodewereinvestigatedbymeansofDSC,TG-DTGandIR.Thereactionmechanismwasproposed.Thekineticmodelfunctionindifferentialform,apparentactivationenergy(Ea)andpre-exponentialfactor(A)ofthisreactionare(3/2)(1-a)[-In(1-a)]^1/3,185.52kJ/moland10^17.78s^-1,respectively.Thecriticaltemperatureofthethermalexplosionofthecompoundis201.30℃.Thevaluesof△S^≠,△H^≠and△G^≠ofthisreactionare72.46J/(mol·K),175.1kJ/moland141.50kJ/mol,respectively.
简介：
简介：Anewapproachtothesynthesisof2,2″-biflavanonesbythereductivedimerizationoffla-vonesisreported.Theproducts,theracemateandmesobiflavanones,havebeenseparatedandtheirstructureshavebeendeterminedonthebasisoftheirspectraldata.Theconfigurationof3bhasbeendeterminedbyX-raycrystallographyaswell.
简介：Anewcompoundbasedonpolyoxovanadate[{Ni(en)2}2Sb8V14O42]·5.5H2O(en=ethylenediamine)(1)wassynthesisedhydrothermallyasblackrhombuscrystals.Compound1crystallizedinthemonoclinicsystemwithspacegroupP21/n,Z=4,a=1.46953(9)nm,b=1.28623(8)nm,c=1.76008(11)nm,β=105.7230(10)°.Intheasymmetricunit,cluster{Sb8V14O42}canbeconsideredasanSbderivativeofthe{V18O42}unit.Each{Sb8V14O42}clusterasabuildingblockinterconnectedtofourotherneighboringunitsby{Ni(en)2}bridginggroupswhicharelinkedthroughtheterminaloxygenatomsofthepolyoxoanions,formingatwodimensionalnetwork.
简介：Themonomericcobalt-phosphite-thiolatocomplex[Co(mpt)2{P(OCH3)3}2]BF4(Hmpt=2-mercaptothiazoline)hasbeenpreparedandcharacterizedbyX-raycrystallography.ThecomplexcrystallizesinthemonoclinicspacegroupC2/cwitha=0.8078(5),b=2.6020(18),c=1.2191(7)nm,β=99.38(1)°,V=2.528(3)nm3,andZ=4.Thestructurecomprisesdiscretecations[Co(mpt)2{P(OCH3)3}2.]+andanionsBF4-,inwhichthecobalt(Ⅲ)atomiscoordinatedtotwochelatempt-andtwoas-orientedmonodentateP(OCH3)3ligandsinahighlydistortedoctahedralgeometry.ThemostdistortedanglesareS(2)-Co(1)-S(2a)of162.23(10)°andN(1)-Co(1)-S(2)of71.47(13)°,thelatteriscausedbythegeometricconstraintofthebidentateligandmpt-.CyclicvoltammetryhasbeenusedtostudytheelectrochemicalbehaviorofthetitlecomplexontheRelectrodeinMeCNsolutionwith0.1mol·L-1ofBun4NBF4aselectrolyte.TheresultsindicatethatthetitlecomplexisunstableinMeCN.
简介：Metalion-imprintedlycrosslinkedchitosanresin1andresin2werepreparedbytheuseofCu^2+andNi^2+astemplateionsandglutaraldehydeascrosslinkingagent,respectively,ThroughinvestigationontheadsorptioncapactiesandbindingconstantsforCu^2+,Ni^2+andCo^2+ionsonchitosanresins,resin1andresin2exhibittheadsorptionselectivityforthemixturesolutionof1L1Cu^2+andNi^2+ions.Theadsorptionselectivityofmetalion-imprintedresinsfortheirtemplateionsinmuchhigherthanthatofuncrosslinkedchitosanresin.
简介：TiO2@ZrO2@Y2O3:有coremultishell结构的Eu3+合成粒子通过layer-by-layer(LBL)的联合被综合自己组装方法和一个solgel过程。获得的样品与扫描电子被描绘显微镜学(SEM)，传播电子显微镜学(TEM)，X光检查光电子光谱学(XPS)，X光检查衍射(XRD)，和荧光spectrophotometry。结果证明合成粒子有coremultishell结构，球形的形态学，和狭窄的尺寸分布。TiO2核心上的ZrO2层的存在能有效地阻止在TiO2核心和Y2O3壳之间的反应；为在在TiO2@ZrO2@Y2O3的TiO2核心和Y2O3壳之间的反应的温度:Eucoremultishell黄磷能被300提高
简介：A60%Fe/Al2O3catalystwaspreparedbytheco-precipitationmethod.ItwasreducedbyH2toproducemetallicFe,whichwasthensulfidedbyCS2toFe0.96SandFe3S4orphosphidedbytriphenylphosphine(PPh3)inliquidphasestoFe2PandFeP.Itwasfoundthattheironsulfides(Fe0.96SandFe3S4)exhibitedthelowactivityforthehydrodesulfurization(HDS)reactions.TheHDSactivitywasalsolowontheFe(metal)/Al2O3andFe2P/Al2O3catalystssincetheywereconvertedintoFe0.96SandFe3S4duringtheHDSreactions.Incontrast,theFeP/Al2O3wasfoundtobestableandactivefortheHDSreactions.Inparticular,FeP/Al2O3possessedsignificantlysmallerFePparticlesthanFeP/C,leadingtothesignificanthigherHDSactivityofFeP/Al2O3thanFeP/C.
简介：Liquid-phase-exfoliationtechnologywasutilizedtopreparelayeredMoS2,WS2,andMoSe2nanosheetsincyclohexylpyrrolidone.Thenonlinearopticalresponseofthesenanosheetsindispersionswasinvestigatedbyobservingspatialself-phasemodulation（SSPM）usinga488nmcontinuouswavelaserbeam.ThediffractionringpatternsofSSPMwerefoundtobedistortedalongtheverticaldirectionrightafterthelasertraversingthenanosheetdispersions.Thenonlinearrefractiveindexofthethreetransitionmetaldichalcogenidesdispersionsn2wasmeasuredtobe10-7cm2W-1,andthethird-ordernonlinearsusceptibilityχ（3）10-9esu.TherelativechangeofeffectivenonlinearrefractiveindexΔn2e∕n（2e）oftheMoS2,WS2,andMoSe2dispersionscanbemodulated0.012–0.240,0.029–0.154,and0.091–0.304,respectively,bychangingtheincidentintensities.Ourexperimentalresultsimplynovelpotentialapplicationoftwo-dimensionaltransitionmetaldichalcogenidesinnonlinearphasemodulationdevices.
客服QQ：30444492琼网文【2021】1550-113号
增值电信业务经营许可证：琼B2-20210322
出版物经营许可证：新出发龙华出字第(2021)009号
广播电视节目制作经营许可证：(琼)字第00779号
版权所有 ©2002-2024 期刊网(www.qikanchina.com) 琼ICP备2021005105号
![Hydrothermal Synthesis and Crystal Structure of a New <b style='color:red'>2</b>D Layer Compound [{Ni（en）<b style='color:red'>2</b>}<b style='color:red'>2</b>Sb8V14O42]·5.5H<b style='color:red'>2</b>O](/image/thesis7 "Hydrothermal Synthesis and Crystal Structure of a New <b style='color:red'>2</b>D Layer Compound [{Ni（en）<b style='color:red'>2</b>}<b style='color:red'>2</b>Sb8V14O42]·5.5H<b style='color:red'>2</b>O")
![Synthesis and crystal structure of [Co（mpt）<b style='color:red'>2</b>{P（OCH3）3}<b style='color:red'>2</b>]BF4 （Hmpt = <b style='color:red'>2</b>-mercaptothiazoline）](/image/thesis10 "Synthesis and crystal structure of [Co（mpt）<b style='color:red'>2</b>{P（OCH3）3}<b style='color:red'>2</b>]BF4 （Hmpt = <b style='color:red'>2</b>-mercaptothiazoline）")
![Tunable nonlinear refractive index of two-dimensional MoS<b style='color:red'>2</b>, WS<b style='color:red'>2</b>, and MoSe<b style='color:red'>2</b> nanosheet dispersions [Invited]](/image/thesis16 "Tunable nonlinear refractive index of two-dimensional MoS<b style='color:red'>2</b>, WS<b style='color:red'>2</b>, and MoSe<b style='color:red'>2</b> nanosheet dispersions [Invited]")
![Synthesis of Novel Binuclear Samarium Thiolate Complexes [（THF）3I<b style='color:red'>2</b>Sm（μ-SAr）]<b style='color:red'>2</b> （Ar=Ph, 4-Me<b style='color:red'>2</b>NC6H4） and Crystal Structure of [（THF）3I<b style='color:red'>2</b>Sm（μ-S-4-Me<b style='color:red'>2</b>NC6H4）]<b style='color:red'>2</b>](/image/thesis17 "Synthesis of Novel Binuclear Samarium Thiolate Complexes [（THF）3I<b style='color:red'>2</b>Sm（μ-SAr）]<b style='color:red'>2</b> （Ar=Ph, 4-Me<b style='color:red'>2</b>NC6H4） and Crystal Structure of [（THF）3I<b style='color:red'>2</b>Sm（μ-S-4-Me<b style='color:red'>2</b>NC6H4）]<b style='color:red'>2</b>")
![Synthesis and Crystal Structure of a <b style='color:red'>2</b>D Honeycomb-like Polymeric Cluster （Et4N）3{[MoS4Cu<b style='color:red'>2</b>（μ-CN）]<b style='color:red'>2</b>（μ＇-CN）}·<b style='color:red'>2</b>MeCN](/image/thesis18 "Synthesis and Crystal Structure of a <b style='color:red'>2</b>D Honeycomb-like Polymeric Cluster （Et4N）3{[MoS4Cu<b style='color:red'>2</b>（μ-CN）]<b style='color:red'>2</b>（μ＇-CN）}·<b style='color:red'>2</b>MeCN")
![Crystal Structure and Bioactivity of Complex [Gd（C10H9N<b style='color:red'>2</b>O4）（C10H8N<b style='color:red'>2</b>O4）（H<b style='color:red'>2</b>O）3]<b style='color:red'>2</b>·phen·4H<b style='color:red'>2</b>O](/image/thesis19 "Crystal Structure and Bioactivity of Complex [Gd（C10H9N<b style='color:red'>2</b>O4）（C10H8N<b style='color:red'>2</b>O4）（H<b style='color:red'>2</b>O）3]<b style='color:red'>2</b>·phen·4H<b style='color:red'>2</b>O")