简介：HeteroatomM-ZSM-12zeolites(M=B,Al,Ge,Ga,Fe)arehydrothermallysynthesizedanditisprovedthattheheteroatomMisinvolvedintheframeworkofsynthesizedmolecularsievesbymeansofXRD,IRspectra.TheresultsofadsorptionanddiffusionexperimentsindicatethattheheteroatomMmodifiestheporevolume,specificsurfacearea,andthechannelofZSM-12molecularsieves.
简介：Thetitlecomplex[NH_3CH_2CH(NH_2)CH_3]_2[M(Ⅵ)O_2(OC_6H_4O)_2](M=Mo_(0.6)W_(0.4))wassynthesizedviaasimplesolution-phasechemicalroute.ThedeterminationofsinglecrystalX-raydiffractionrevealedthatthetitlecompoundiscrystallizedinamonoclinicsystemwithP2(1)/nspacegroup,a=1.0913(10)nm,b=1.0442(10)nm,c=1.8842(19)nm,α=90°,β=96.530(17)°,γ=90°,Z=4,andV=2.133(4)nm3.Themononuclearanionicunit[M(Ⅵ)O2(OC6H4O)2]2-displayschiralpseudo-octahedral[MO_6]coordinationgeometryandislinkedbychiralcationsviahydrogenbondandπ…πstackinginteraction.Thetransmissionelectronmicroscopyimagesshowthatthetitlecomplexiscomprisedofnano-particleswithdiametersrangingfrom20to50nm.TheNMRstudyshowsthe1Hdownfieldchemicalshiftsof[NH_3CHaHbCH(NH_2)CH_3]+cationsinthetitlecomplexwhenitismixedwithadenosine-triphosphate(ATP),andthechemicalshiftdifferencebetweenHaandHbisincreasedgreatly,andmostofthecatecholateligandsdissociatefromthecentralmetalatoms.TheDNAcleavageactivityexperimentrevealsthatDNAcleavagepromotedbythetitlecomplexislowerthanthatbyNa_2MoO_4whichpossessesantitumorpro-perty,buthigherthanthatbyNa_2WO_4.
简介：Bytheadditionalreactionofbinuclearcompounds(Me4N)2M2S4(TDT)2(M=Mo,W;H2TDT=H2CH3C6H3S2)withmononuclearcuprouscomplex,twonewM-Cu-SclustersMo2Cu2S4(TDT)2-(PPh3)2·CH3CH2OH(1)andW2Cu2S4(TDT)2(PPh3)2·0.5CH3CH2OH-0.5H2O(2)havebeenpreparedandcharacterizedbyIR,UV-Vis,31PNMRspectroscopy,cyclicvoltammetryandsinglecrystalX-raystructureanalysis.BothcompoundscrystallizeinspacegroupP21/nwithlatticeparametersa=1.0956(3),b=2.2072(3),c=2.4340(3)nm,β=100.36(2)°,V=5.790(3)nm3andZ=4for1anda=1.0965(9),b=2.2135(3),c=2.4317(4)nm,β=99.63(8)°,V=5.819(8)nm3andZ=4for2.Bothmolecularstructurescontainacubane-likeclustercore[M2Cu2S4](M=Mo,W)andtheirskeletonsarealmostthesameexceptforMatoms.Thesyntheses,structuresandspectrumcharacterizationsofthesetwoclustersarediscussed.Thethird-ordernonlinearoptical(NLO)propertyofthetwoclusterswasstudiedbythetechniqueofforwarddegeneratefour
简介：利用电介质的平均能带模型计算了PrBa2Cu3O7的化学键参数，得到Cu(1)-O键的人价性为0．41，Cu(2)－O键的平均共价性为0．28，应用由共价性和要化率定义的化学环境因子计算了^57Fe在PrBa2Cu3O7中的Mossbauer同质异能位移，确定了^57Fe在PrBa2Cu3O7中的价态和占位情况。
简介：Theoptimalconditionsforthecomplexationreactionofmeso-tetra(3-methoxy-4-hy-droxyphenyl)porphineT(3-M-4HP)Pwithplatinumandrhodiumarepresented.Beer’sLawisobeyedwhentheconcentrationofrhodiumisintherangeof0.45-1.15μg/25mL.Themolarabsorptivityofrhodiumwasfoundtobe1.99×106L·mol-1·cm-1at460nm.ThevalueofεPtwasfoundtobe6.28×105L·mol-1·cm-1bylinearregressionmethod.TheKcoefficientmethodandcompensatingcoefficientwereusedtodetermineplatinumandrhodiumsimultaneoulywithoutremovalormaskingoftheinterferentsinthesample.Theresultsforthedeterminationofplatinumandrhodiuminthemixedsolutionofplatinumandrhodiumaresatisfactory.
简介：[Co3(1,2-S2C6H4)3(PPh3)3][CoBr3(DMF)].sol(1,sol=CHCl3,O(C2H5)2,H2O)wasobtainedfromthereactionofCoBr(PPh3)3withNa2(S2C6H4)inchloroform.TheCo3coreinthecationof1exhibitsametal-metalbondedisoscelestriangle,inwhichthetwolongerCo-CobondsarebothbridgedbyS2C6H4ligandsontwosidesofthetriangleplanerespectively,whilethebottomshortCo-CobondisbridgedbythethirdbidentateS2C6H4ligand.Aseriesofpolynu-clearcobaltclustercompoundswithphosphine,thiolateand/orsulphurligandswerepreparedbylowoxidationstateCo+withthiolatesinorganicsolvents.Thesetri-,tetra-,hexa-,heptanuclearclustercompounds1-8withvarioustypesofcrystalstructurescanbeviewedasthecondensedpolynuclearcobaltcomplexesthatthecobaltatomframeworkswithsulphurbridgedwerebuiltthroughthesmalltriangularunitsof[Co3S3nL3](n=1,2)withorwithout[CoL](L=PR3,Br,Cl,5-C5H5)fragments.
简介：Threenewcomplexes[Ni(H2L)][Fe(CN)5(NO)]2·6H2O(1),[Ni(H2L)][Fe(CN)5(NO)]2·4H2O(2)and[Cu(H2L)][Fe-(CN)5(NO)]2·4H2O(3)(L=3,10-bis(2-aminoethyl)-1,3,5,8,10,12-hexaazacyotetradecane)arepreparedandcharacter-izedbyIR,elementalanalysesandsingle-crystalX-rayanaly-ses,indicatingthattheyarethefirstexamplesoftrinurlearni-troprnsside-bridgedMFe2(M=CuandHi)complexes.Inthethreecomplexes,thecentralmetalatoms(M)areallsix-coor-dinatedbythenitrogenatomsfromthemacroeyclicligandandtwocyano-bridgesatthetrans-positionstoformdistortedocta-hedralconfigurations.TheaxialN—M—NlinkageisnearlyverticaltotheequatorialplanedefinedbyfourcoordinatingNatomsofmcroeyclicligand.TheC≡N—Nibondangleof172.6°incompleox1isapparentlylargerthanthoseincom-plexes2and3(152.57°and136.37°,respectively).Thethreecomplexesareallconnectedbyhydrogenbondsinto3Dnet-works.Thisstudyshowsthatthecyano-bridgedtrinuclearspeciescouldbegeneratedviathecontrolofthechargeofthebuildingblocks.
简介：FiveC3/C3fluoroquinolonedimerstetheredwithafusedheterocyclicringofs-triazolo[2,1-b][1,3,4]thiadiazolederivedfromantibacterialquinolonesweresynthesizedandcharacterized,andtheirinvitroantitumoractivityagainstL1210,CHOcelllineswasevaluatedviatherespectiveIC50values.
简介：Anewμ3-Otriiron（Ⅲ）complex[Fe3O（OBz）6（CH3OH）3]（NO3）（CH3OH）2（HOBZ=benzoicacid）hasbeensynthesized,itsstructurehasbeendeterminedandvariabletemperaturemagneticsusceptilityhasalsobeenmeasured.Inthemolecule,threeironatomsformedanequilateraltrianglewithu3-Oincenter.ThefittingtothemagneticsusceptibilityshowedthatanintramolecularantiferromagneticexchangeinteractionoccurredbetweenironatomswithJ=-25.51cm-1,andaweakerintermolecularantiferromagneticexchangeinteractionoccurredwithzJ’=-2.30cm-1.
简介：
简介：Anumberofnaphthalenedonorcompoundsthatpossessanadamantanaminebindingmoietyandan(OCH2CH2)n(nn1,2,3,4,6,8)spacerweresynthesized.Thefluorescencequenchingbetweenthesedonorsubstratesandmono-6-O-p-nitrobenzoyl-β-cyclodextrin(pNBCD)andmono-6-O-m-nitrobenzoyl-β-cyclodextrin(mNBCD)wasstudiedindetail.Itwasfoundthatveryefficientfluorescencequenchingcouldoccurinthesesupramolecularsystems.Thisquenchingwasattributedtothephotoinducedelectrontransferinsidethesupramolecularassemblybetweenthenaphthalenedonorsandcyclodextrinacceptors.DetailedStern-VolmerconstantsweremeasuredandtheywerepartitionedintodynamicStern-Volmerquenchingconstantsandstaticbindingconstants.Itwasdemonstratedthatthebindingconstantsbetweenallthenaphthalenecompoundsandcyclodextrinsarethesameastheypossessthesamebindingsite,i.e.,adamantanamine.
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
![Imidazole Coordinated Sandwich-type Antimony Polyoxotungstates Na9[ {Na（H=O<b style='color:red'>2</b>}<b style='color:red'>3</b>{<b style='color:red'>M</b>（<b style='color:red'>C</b><b style='color:red'>3</b>H4N<b style='color:red'>2</b>）}<b style='color:red'>3</b>（ Sb W9O33）<b style='color:red'>2</b>]·xH=O（<b style='color:red'>M</b>=Ni^Ⅱ, Co^Ⅱ, Zn^Ⅱ, Mn^Ⅱ）](/image/thesis0 "Imidazole Coordinated Sandwich-type Antimony Polyoxotungstates Na9[ {Na（H=O<b style='color:red'>2</b>}<b style='color:red'>3</b>{<b style='color:red'>M</b>（<b style='color:red'>C</b><b style='color:red'>3</b>H4N<b style='color:red'>2</b>）}<b style='color:red'>3</b>（ Sb W9O33）<b style='color:red'>2</b>]·xH=O（<b style='color:red'>M</b>=Ni^Ⅱ, Co^Ⅱ, Zn^Ⅱ, Mn^Ⅱ）")
![Crystal Structure, Nano-particle Morphology and Interaction with ATP of [ NH<b style='color:red'>3</b> CH<b style='color:red'>2</b> CH（ NH<b style='color:red'>2</b> ） CH<b style='color:red'>3</b> ]<b style='color:red'>2</b> [ <b style='color:red'>M</b>（ Ⅵ ） O<b style='color:red'>2</b> （ OC<b style='color:red'>6</b> H4 O）<b style='color:red'>2</b> ] （<b style='color:red'>M</b> = Mo0. <b style='color:red'>6</b> W0. 4 ） and Its Activity to Promote DNA Cleavage](/image/thesis4 "Crystal Structure, Nano-particle Morphology and Interaction with ATP of [ NH<b style='color:red'>3</b> CH<b style='color:red'>2</b> CH（ NH<b style='color:red'>2</b> ） CH<b style='color:red'>3</b> ]<b style='color:red'>2</b> [ <b style='color:red'>M</b>（ Ⅵ ） O<b style='color:red'>2</b> （ OC<b style='color:red'>6</b> H4 O）<b style='color:red'>2</b> ] （<b style='color:red'>M</b> = Mo0. <b style='color:red'>6</b> W0. 4 ） and Its Activity to Promote DNA Cleavage")
![[Co<b style='color:red'>3</b>（<b style='color:red'>1</b>,2-<b style='color:red'>S</b><b style='color:red'>2</b><b style='color:red'>C</b><b style='color:red'>6</b>H4）<b style='color:red'>3</b>（PPh<b style='color:red'>3</b>）<b style='color:red'>3</b>]+, A basic triangle unit of some polynuclear molecules](/image/thesis10 "[Co<b style='color:red'>3</b>（<b style='color:red'>1</b>,2-<b style='color:red'>S</b><b style='color:red'>2</b><b style='color:red'>C</b><b style='color:red'>6</b>H4）<b style='color:red'>3</b>（PPh<b style='color:red'>3</b>）<b style='color:red'>3</b>]+, A basic triangle unit of some polynuclear molecules")
![Synthesis and antitumor evaluation of <b style='color:red'>C</b><b style='color:red'>3</b>/<b style='color:red'>C</b><b style='color:red'>3</b> fluoroquinolone dimers (I): Tethered with a fused heterocyclic <b style='color:red'>s</b>-triazolo[<b style='color:red'>2</b>,1-b][<b style='color:red'>1</b>,<b style='color:red'>3</b>,4]thiadiazole](/image/thesis14 "Synthesis and antitumor evaluation of <b style='color:red'>C</b><b style='color:red'>3</b>/<b style='color:red'>C</b><b style='color:red'>3</b> fluoroquinolone dimers (I): Tethered with a fused heterocyclic <b style='color:red'>s</b>-triazolo[<b style='color:red'>2</b>,1-b][<b style='color:red'>1</b>,<b style='color:red'>3</b>,4]thiadiazole")
![The structure and magnetic properties of μ<b style='color:red'>3</b>-oxotriiron（Ⅲ） complex [Fe<b style='color:red'>3</b>O（OBz）<b style='color:red'>6</b>（CH<b style='color:red'>3</b>OH）<b style='color:red'>3</b>]（NO<b style='color:red'>3</b>）（CH<b style='color:red'>3</b>OH）<b style='color:red'>2</b>](/image/thesis16 "The structure and magnetic properties of μ<b style='color:red'>3</b>-oxotriiron（Ⅲ） complex [Fe<b style='color:red'>3</b>O（OBz）<b style='color:red'>6</b>（CH<b style='color:red'>3</b>OH）<b style='color:red'>3</b>]（NO<b style='color:red'>3</b>）（CH<b style='color:red'>3</b>OH）<b style='color:red'>2</b>")
![Formation of the [<b style='color:red'>M</b>+NH4]+ Ious of Some Mouo-and Di-saccharides in Fast Atom Bombardment Mass Spectrometry](/image/thesis17 "Formation of the [<b style='color:red'>M</b>+NH4]+ Ious of Some Mouo-and Di-saccharides in Fast Atom Bombardment Mass Spectrometry")
![LDH-[PW7Mo<b style='color:red'>3</b>Cu<b style='color:red'>2</b>O38（H<b style='color:red'>2</b>O）<b style='color:red'>2</b>]（<b style='color:red'>M</b>=Fe<b style='color:red'>2</b>＋，Co<b style='color:red'>2</b>＋，Cu<b style='color:red'>2</b>＋，Ni<b style='color:red'>2</b>＋和Mn<b style='color:red'>2</b>＋）层状化合物的合成、表征及催化活性](/image/thesis18 "LDH-[PW7Mo<b style='color:red'>3</b>Cu<b style='color:red'>2</b>O38（H<b style='color:red'>2</b>O）<b style='color:red'>2</b>]（<b style='color:red'>M</b>=Fe<b style='color:red'>2</b>＋，Co<b style='color:red'>2</b>＋，Cu<b style='color:red'>2</b>＋，Ni<b style='color:red'>2</b>＋和Mn<b style='color:red'>2</b>＋）层状化合物的合成、表征及催化活性")
