简介：Thesolidaddofthefirstprotonatedzincoborophosphate,(H3O)Zn(H2O)2BP2O8·H2O(1),wassoventothermallysyn-thesizedbythereactionofZn(NO3)2·6H2OandH3BO3withH3PO4inamixedsolvent,andstructurallycharacterizedbysingle-ystalX-raydiffractionanalysis.ItcrystallizesinthehexagonalP6122,a=0.9604(4)nm,c=1.5297(6)nm,V=1.2218(8)nm^3,Dc=2.921g/cm^3,Z=6,F(000)=1080,μ=3.495mm^-1.Thestmchwefeaturesthatthetetrahedra-te-trahedrahdlcesinterconnectedbyoctahedraandstronghydro-gembondinteractionsformathree-dimensionalframework.Theprotonatedwatermoleculesarelocatedatuniquepositions.othercharacterizationsbyIRandthermalanalysisarealsode-scribed.
简介：Co-electrolysisofCO2andH2Ousinghigh-temperaturesolidoxideelectrolysiscells（SOECs）intovaluablechemicalshasattractedgreatattentionsrecentlyduetothehighconversionandenergyefficiency,whichprovidesopportunitiesofreducingCO2emission,mitigatingglobalwarmingandstoringintermittentrenewableenergies.AsingleSOECtypicallyconsistsofanionconductingelectrolyte,ananodeandacathodewheretheco-electrolysisreactiontakesplace.Thehighoperatingtemperatureanddifficultactivatedcarbon-oxygendouble-bondofCO2putforwardstrictrequirementsforSOECcathode.Greateffortsarebeingdevotedtodevelopsuitablecathodematerialswithhighcatalyticactivityandexcellentlong-termstabilityforCO2/H2Oelectro-reduction.Thesofarcathodematerialdevelopmentisthekeypointofthisreviewandalternativestrategiesofhigh-performancecathodematerialpreparationisproposed.UnderstandingthemechanismofCO2/H2Oelectro-reductionisbeneficialtohighlyactivecathodedesignandoptimization.Thusthepossiblereactionmechanismisalsodiscussed.Especially,amethodincombinationwithelectrochemicalimpedancespectroscopy（EIS）measurement,distributionfunctionsofrelaxationtimes（DRT）calculation,complexnonlinearleastsquare（CNLS）fittingandoperandoambientpressureX-rayphotoelectronspectroscopy（APXPS）characterizationisintroducedtocorrectlydisclosethereactionmechanismofCO2/H2Oco-electrolysis.Finally,differentreactionmodesoftheCO2/H2OcoelectrolysisinSOECsaresummarizedtooffernewstrategiestoenhancetheCO2conversion.Otherwise,developingSOECsoperatingat300-600°CcanintegratetheelectrochemicalreductionandtheFischer-TropschreactiontoconverttheCO2/H2Ointomorevaluablechemicals,whichwillbeanewresearchdirectioninthefuture.
简介：利用水热方法制备了一个新的过渡金属镉配合物[Cd（1，3-BDC）（L）（H2O）2]·H2O（1，3-H2BDC=间苯二甲酸，L=2-（3-吡啶基）-1H-苯并咪唑），并通过元素分析、红外光谱和X-射线单晶衍射方法确定了该配合物的晶体结构．结构分析表明该配合物属于单斜晶系，P21／c空间群，晶胞参数a=1．01641（6）nm，b=2．08842（12）nm，C=1．00l38（6）nm，β=106．3360（10）°，V=2．0398（2）nm3，Z=4，R1=0．0207，wR2=0．494．配合物中CdⅡ“离子与L配体的1个吡啶N原子、1，3-BDC的4个氧原子和2个配位水的O原子配位，形成七配位的扭曲十面体结构．配体1，3-BDC的桥连相邻的CdⅡ离子形成一维聚合物链，相邻链间通过氢键和π…π作用形成三维超分子网络，并对该配合物的热稳定性和荧光性质进行了研究．
简介：The2-Dheteronuclearcoordinationpolymer{[Ag4Fe2(SCN)12(H2O)2][(inaH)2(H2O)2]}n(1)(inaHistheabbreviationofprotonatedisonicotinicacid)withchemicalformulaC24H20Ag4Fe2N14O8S12hasbeensynthesizedandcharacterizedbysinglecrystalX-raydiffraction,elementalanalysisandIRspectroscopy.TheAgES2ringsconnecttwokindsofoctahedralgeometriesofFe(Ⅲ)ions,[Fe(NCS)6]^3-and[Fe(H2O)E(NCS)4]^-unitswithbridgingthiocyanateionsleadingto2-D[Ag4Fe2(SCN)12(H2O)2]^2-anionframework.Fourkindsofringsincludingtheunprecedentedthirty-twomemberedAg4Fe4(SCN)8ringssharecomersoredgesinthe2-Danionlayerstructure.AllthiocyanatescoordinatetothemetalionsaccordingtotheHSABprinciplewithNatomsbindingtotheFe(Ⅲ)ionsandwithSatomsbindingtoAg(I)ions.Pronoatedinacationsstabilizethelayerstructureascounterionsandhydrogenbondswereformedwithinthepronoatedinacationsdimerandbetweenthedimersandthelatticewaters.Crystaldata:Mr=1560.44,triclinic,P-↑1,a=0.76082(1)nm,b=0.9234nm,c=1.85611(4)nm,α=103.0170(10)°,β=93.7780(10)°,γ=97.4080(10)°,V=1.25385(3)nm^3,Z=1,μ(MoKα)=2.650mm^-1,Dc=2.067g·cm^-3,F(000)=758,R1=0.0412,wR2=0.1003.
简介：TheelectrooxidationofBilirubin（BR）inN,N’-dimethylformamide（DMF）andDMF+H2Omixedsolventisinvestigatedbyvoltammetrytechniques,insiturapidscanthinlayerspectroelectrochemistryandinsituESRspectroscopy.ThedatarevealthattheoxidationprocessofBRundergoesmanystages,whichareallspedupbytheintroductionofwater.ThespeciesofbilirubintakingpartinthereactionisfoundtobechangedfromBRinDMFintoBR’inthemixedsolventsandtheanodicpeakpotentialisshiftedcorrespondinglyfrom+0.58Vto+0.026-+0.35V（vs.Ag/AgCl,1.0MKCl）.Freeradicalsandthedimerizationofthemareobservedduringtheoxidation.
简介：Thecopper(Ⅱ）complex[Cu3(nta)2(azpy)2(H2O2)]·6H2O(nta=nitrilotriacetate,azpy=4,4′-azobispyridine)hasbeensynthesizedandcharacterized.TheX-rayanalysisrevealsthattherearetwokindsofcopper(Ⅱ）coordinationenvironments.Cu(1)hasadistortedsquareplanesymmetryandCu(2)hasadistortedoctahedralsymmetry.Cu(1)islinkedtoCu(2)throughntaandboundtoCu(1C)byazpy,andCu(2)islinkedtoCu(2A)throughazpy,whichextendstotwo-dimensionalnetworkwithlargerhombus1.2nm×1.7nm.
简介：研究了至今为止已发现的20个河外H2O超脉泽源的观测参数。多数河外H2O超脉泽源的光度在几十至几百个L⊙之内，但TXFS2226-184源的河外H2O超脉泽源光度达6100L⊙它属于射电星系类型，主要是由于其谱线轮廓较宽所造成的一种例外情况。所有20个河外H2O超脉泽源的系统速度约为几百到几千km·s^-1，16个河外H2O超脉泽源的峰值流量密度小于1Jy，但有4个河外H2O超脉泽源的峰值流量密度大于6Jy(6．2～16Jy)。通过对这些河外H2O超脉泽源的观测参数特征的分析和研究，得到这些观测参数之间的相关关系为：河外H2O超脉泽源的峰值流量密度的对数分别与系统速度的对数和距离的对数之间存在着反相关关系。而河外H2O超脉泽源的光度的对数与距离平方和峰值流量密度乘积的对数之间存在着正相关关系。
简介：Inamixedsolventofaceticacid(AcOH)/water,methylenediphenyldicarbamate(MDC)wassynthesizedbythecondensationofmethylphenylcarbamate(MPC)andformaldehydeinthepresenceofaninorganicacidcatalyst.BasedonthedifferentsolubilitiestoMPCandMDC,themixedsolventshowedhighercatalyticperformancethanpurewater.ThemixedsolventnotonlypromotedthecondensationofMPCbutasloexhibitedtheadvantageoftheproductseparationwiththereactants.Undertheoptimizedconditions:aH_2SO_4massfractionof31%,areactiontemperatureof95℃andreactiontimeof3.5h,theyieldofMDCreached74.3%.Inaddition,therecycleofthesolventwasalsoinvestigated.
简介：本文报道了Ｃ６Ｈ１２Ｏ６（ＮＨ４）２ＳＯ４Ｃ２Ｈ５ＯＨＨ２Ｏ（Ｃ２Ｈ５ＯＨ／Ｈ２Ｏ＝０．９０）体系在３５℃时体系溶解度和饱和溶液的折光指数，并绘出了体系相应的溶度图和饱和溶液的折光指数曲线图。结果表明：所研究的体系为四元体系Ｃ６Ｈ１２Ｏ６（ＮＨ４）２ＳＯ４Ｃ２Ｈ５ＯＨＨ２Ｏ中的一部分。当溶液中肌醇饱和时，溶度曲线落在约５０％的等醇水比面上。当（ＮＨ４）２ＳＯ４在溶液中达到饱和时，出现共饱点。其组成为（ＮＨ４）２ＳＯ４：２１０％，Ｃ６Ｈ１２Ｏ６：２．０８％，Ｃ２Ｈ５ＯＨ：４４７５％。同时出现分层，在富醇相随着乙醇浓度的增加，出现肌醇与硫酸铵共饱线。在富水相硫酸铵饱和溶度曲线落在约５％乙醇的等醇水比面上，折光指数曲线由三支组成，其中两条分别与Ｃ６Ｈ１２Ｏ６·Ｈ２Ｏ和（ＮＨ４）２ＳＯ４相对应，另外一条线与（ＮＨ４）２ＳＯ４和Ｃ６Ｈ１２Ｏ６·Ｈ２Ｏ的共饱线相对应
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
![Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4[Cr30（<b style='color:red'>H</b><b style='color:red'>2O</b>） 3（OOCH） 6] <b style='color:red'>2</b>[ P<b style='color:red'>2</b>W18<b style='color:red'>O</b>62]· 9.5<b style='color:red'>H</b><b style='color:red'>2</b> <b style='color:red'>O</b> and K4[ Cr3<b style='color:red'>O</b>（ <b style='color:red'>H</b><b style='color:red'>2O</b>）3（ OOCH）6 ]<b style='color:red'>2</b>[ <b style='color:red'>H</b>3 P<b style='color:red'>2</b> W17<b style='color:red'>Co</b>（<b style='color:red'>H</b><b style='color:red'>2O</b>） <b style='color:red'>O</b>61]· 20<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>](/image/thesis4 "Syntheses, Crystal Structures and Characterization of Two Zeotype Crystals of K4[Cr30（<b style='color:red'>H</b><b style='color:red'>2O</b>） 3（OOCH） 6] <b style='color:red'>2</b>[ P<b style='color:red'>2</b>W18<b style='color:red'>O</b>62]· 9.5<b style='color:red'>H</b><b style='color:red'>2</b> <b style='color:red'>O</b> and K4[ Cr3<b style='color:red'>O</b>（ <b style='color:red'>H</b><b style='color:red'>2O</b>）3（ OOCH）6 ]<b style='color:red'>2</b>[ <b style='color:red'>H</b>3 P<b style='color:red'>2</b> W17<b style='color:red'>Co</b>（<b style='color:red'>H</b><b style='color:red'>2O</b>） <b style='color:red'>O</b>61]· 20<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>")
![[Mn3Ⅱ(CH3COO)6(<b style='color:red'>H</b><b style='color:red'>2O</b>)4·(<b style='color:red'>H</b><b style='color:red'>2O</b>)<b style='color:red'>2</b>]n的合成、结构与磁性研究](/image/thesis8 "[Mn3Ⅱ(CH3COO)6(<b style='color:red'>H</b><b style='color:red'>2O</b>)4·(<b style='color:red'>H</b><b style='color:red'>2O</b>)<b style='color:red'>2</b>]n的合成、结构与磁性研究")
![配合物[Cd（1，3-BDC）（L）（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]·<b style='color:red'>H</b><b style='color:red'>2O</b>的水热合成、晶体结构和荧光性质](/image/thesis9 "配合物[Cd（1，3-BDC）（L）（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]·<b style='color:red'>H</b><b style='color:red'>2O</b>的水热合成、晶体结构和荧光性质")
![Synthesis and Crystal Structure of a Two-dimensional Silver（Ⅰ）-Iron（Ⅲ） Heteronuclear Coordination Polymer： {[Ag4Fe<b style='color:red'>2</b>（SCN）12（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>] [（inaH）<b style='color:red'>2</b>（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]}n](/image/thesis10 "Synthesis and Crystal Structure of a Two-dimensional Silver（Ⅰ）-Iron（Ⅲ） Heteronuclear Coordination Polymer： {[Ag4Fe<b style='color:red'>2</b>（SCN）12（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>] [（inaH）<b style='color:red'>2</b>（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]}n")
![Crystal Structure and Bioactivity of Complex [Gd（C10<b style='color:red'>H</b>9N<b style='color:red'>2</b><b style='color:red'>O</b>4）（C10<b style='color:red'>H</b>8N<b style='color:red'>2</b><b style='color:red'>O</b>4）（<b style='color:red'>H</b><b style='color:red'>2O</b>）3]<b style='color:red'>2</b>·phen·4<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>](/image/thesis11 "Crystal Structure and Bioactivity of Complex [Gd（C10<b style='color:red'>H</b>9N<b style='color:red'>2</b><b style='color:red'>O</b>4）（C10<b style='color:red'>H</b>8N<b style='color:red'>2</b><b style='color:red'>O</b>4）（<b style='color:red'>H</b><b style='color:red'>2O</b>）3]<b style='color:red'>2</b>·phen·4<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>")
![Synthesis,Structure and Characterization of Two—dimensional Network Copper Complex [Cu3（nta）<b style='color:red'>2</b>（azpy）<b style='color:red'>2</b>（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]·6<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>](/image/thesis13 "Synthesis,Structure and Characterization of Two—dimensional Network Copper Complex [Cu3（nta）<b style='color:red'>2</b>（azpy）<b style='color:red'>2</b>（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]·6<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>")
![K8[ZnMg（<b style='color:red'>H</b><b style='color:red'>2O</b>）W11<b style='color:red'>O</b>39]·15<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>的合成、表征及化学热扩渗](/image/thesis18 "K8[ZnMg（<b style='color:red'>H</b><b style='color:red'>2O</b>）W11<b style='color:red'>O</b>39]·15<b style='color:red'>H</b><b style='color:red'>2</b><b style='color:red'>O</b>的合成、表征及化学热扩渗")
![Crystal Structure, Thermal Decomposition Behavior and the Standard Molar Enthalpy of Formation of a Novel 3D Hydrogen- Bonded Supramolecular [<b style='color:red'>Co</b>（HnicO）<b style='color:red'>2</b>·（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]](/image/thesis19 "Crystal Structure, Thermal Decomposition Behavior and the Standard Molar Enthalpy of Formation of a Novel 3D Hydrogen- Bonded Supramolecular [<b style='color:red'>Co</b>（HnicO）<b style='color:red'>2</b>·（<b style='color:red'>H</b><b style='color:red'>2O</b>）<b style='color:red'>2</b>]")