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1.
DuringclosedcycleCO2laserproces,owingtothedecompositionofCO2,theCOandO2producednotonlylowerthedischargestabilityofCO2laserbu...  相似文献   

2.
IntroductionThediscoveryofthesuperconductivityoftheBa-La-Cu-Osystemathightemperatureshasgreatlystimulatedtheinvestigationofcuprates[1].Cuprateshavebeenfoundtobeactivecatalystsforseveralreactions,includingthereductionanddecompositionofN2O,NOandNO2,the…  相似文献   

3.
Synthesis and Characterization of Zinc Succinate, Zn(C4H4O4)   总被引:3,自引:0,他引:3  
Introduction  Succinateion (C4H4O4) 2 -(—OOCCH2 CH2 COO— )isaversatileligandsinceeachofthefourterminalcarboxyloxygensisabletoparticipateincoordinationtocentralmetalatom(s)inadditiontotheflexibilityoftheC—Cbone .Suchcoordinatingversatilityhasbeenreflectedinseve…  相似文献   

4.
1 INTRODUCTIONWehaveshownaninterestinexopolyhedralcyclizationofmetalligandstocluster.AseriesofmetallaboranecompoundscontainingfivememberedringssuchasM-O-C-O-BandM-S-C-O-Baresynthesizedandcharacterized.Thegroupsofcyclizationincludeacetate〔1〕,benzoat…  相似文献   

5.
1 INTRODUCTIONMetal organicchemicaldeposition(MOCVD)isanappealingtechniqueforelec tronicapplications.AsoneoftheMOCVDsourcematerialsforYBCOsuperconductorfilms,bis( 2 ,2 ,6,6 tetramethyl 3,5 heptanedionate)bariumhasbeenextensivelyusedinthepast[1~ 3].Thelargesizeofthe…  相似文献   

6.
1 INTRODUCTIONResearchonSHGeffecthasbeenonaremarkablepositioninorganicnonlinearoptical(NLO)materialsfield.Theconjugateddelocalizedπelectronspossiblyresultinthesecond-orderNLOpropertyoforganiccompounds,soanumberofnitroanilinederivatives,suchas2-methyl…  相似文献   

7.
1 INTRODUCTIONRecentyearshavewitnessedamarkedincreaseintheliteratureintheuseofsele niumandtelluriumasbridgingandstabilizingligandssincetheyexhibitunusualstruc turalandreactivitypatterns.〔1〕Ourongoingresearchprogramaimedatexploringnewconvenientsynthetic…  相似文献   

8.
Co ̄ndenceauthor.Oaf((k6<l)adspeciesPeakswerefoundtodisappearat573'K.Duringthetemperatureelevation,theCeOZFZgandO2-Peakswerefoundtobroadenandshifttolowerwavenumbers.ThefhaluencyshiftwilhresecttotemperatureisawellknownphenomenoninRamanspectroscopyofsolidsanditisrelatedtothetherma]expansionoflatticeparameters.At1023'K,theO2-adspecies(at1159cm-l)andCeOZF2,(at449cm-l)peakswerefoundtoremainexistingonthesurfaceofceriumoalde.WhentheOZ-pretreatedCeOZsamplewaswarmedsuccessivelyinaflowofCd,thereachonsofCabwithlaniceo  相似文献   

9.
1 INTRODUCTIONSolid stateboratesexhibitavarietyofphysicalandchemicalfeatures,rangingfromnonlinearopticalpropertiesof β BaB2 O4(β BBO) [1 ] tothecatalyticactivityofCu2 Al6B4O1 7[2 ] ,whichhaveattractedgreatattentionofmanyscientificresearchers.Aspartofourefforttosynt…  相似文献   

10.
Incomparisonwithinorganicnonlinearoptic(NLO)materials,organicpolymericNLOmaterialshavemanyadvantages,suchasliablemoleculardesignandoptimization,largernonresonanceNLOcoefficiency,lowerdielectricconstant,goodworkingability,opticaltransparencyandresistancea…  相似文献   

11.
1 INTRODUCTIONOwingtotheirpossibleimportantrolesinlifeprocesses,cubanetypetetranuclearmolybdenumclustershavebeenextensivelyexploredduringthepasttwodecades,ofwhichtheclustercompoundsthatcontain〔Mo4XS3〕(X=SorO)corehaveattractedspecialattention〔17〕.Asp…  相似文献   

12.
IntroductionYttriumtantalatescanexistinfourformsYTaO4,YTa7O19,Y3TaO7andYTa3O9,amongwhichyttriumorthotantalatehasrecievedmoreattention.RareearthorthotantalatesareakindofpromisinghostmaterialsfornewX-rayphosphorssincetheycontainelementsofhighatomicnumb…  相似文献   

13.
Horseradishperoxidase(HRP)canstronglycatalyzethereactionofH2O2oxidizingophenylenediamine(OPD),thechromaticproductofwhichcanbedetectedinenzymelinkedimmunosorbentassay(ELISA)withspectrophotometry[1].Involtammetricenzymelinkedimmunoassay[2—4],OPDH2O2HRPsystemhasf…  相似文献   

14.
IntroductionPreviously,wereportedthecrystalstructureofK2[Ni(CO3)2(H2O)4][1],whichcrystallizedinthebaylissitetypestructureandwasfoundtobeisostructuralwithK2[Co(CO3)2(H2O)4][2]andK2Mg(CO3)2·4H2O[3].Inordertosystematicallyinvestigatetheoccurrenceoftheco…  相似文献   

15.
1 INTRODUCTIONCertaincoppercomplexeshavebeenshowntohaveunusualchemicalpropertiessuchasoxygentransfer,oxidativeadditionandhomogenouscatalytichydrogenation[1].Oxidativeadditionreactionsarekeystepsintheactivationofσbondsinagreatnumberofcatalyticprocess.Cop…  相似文献   

16.
1 INTRODUCTIONTheorganicsecondordernonlinearoptical(NLO)materialshavebeenpaidmoreandmoreattentionsbecauseoftheirimportantapplicationsinoptoelectronicstechnologyfields.[1~3]Theirsecondharmonicgeneration(SHG)efficienciesusuallyexceedthoseofcommonlyusedinorg…  相似文献   

17.
1 INTRODUCTIONTransitionmetalclustercomplexeshavebeenreceivingconsiderableattentioninrecent yearslargelybecauseoftheir potentialapplicationsincatalysisaswellasthenoveltyandversatilityoftheirreactionsandstructures.[1~ 4] Ourinterestinmetalclustercatalysisp…  相似文献   

18.
STUDYONSYNTHESIS,CHARACTERIZATIONANDCATALYSISOFPILLAREDANIONCLAY(Ⅲ)──SYNTHESISOFZnAl-BW_(11)O_(39)Z(H_2)~(n-)ThanksforthesupportofFoundationofCECandtheopenlabofHydrothermalSynthesisinJinnUniversityeddifferentkindsoftriheteropolyoxometalate(TH'POMs)totheZnAIlayeredclays,usingtheesterificationofn-butylalcoholandaceticacidasprobereaction.andfoundthatthepillaredcompoundsweremoreactiveandselectivethanthesolidacidcatalystssuchasacidicion-exchangeresinsl4].Onthebasisofpreviouswork.wenowencapsulatetriheteropolyoxome  相似文献   

19.
TNSTRUCTIONSTOCONTRIBUTORS¥1.OCLisamonthlyjournal.publishedbytheChineseChemicalSociety,OCLwillpublishpreliminaryacccuntsinthe...  相似文献   

20.
1INTRODUCTIONOctacarbonyldicobaltisaveryconvenientstartingmaterialforthepreparationofalmostanycobaltcompound〔1〕.Thereactionso...  相似文献   

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