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1.
Ferricoxide(αFe2O3),chromicoxide(αCr2O3)andtheirmixedcompoundshaveimportantapplicationinmanyfields.Forinstance,theycanbeusedascatalystsforhightemperaturewatergasshiftreaction[1]andreductionofNOxbyNH3[2],asrefractorymaterials[3]andsensingmaterials[4,5],andsoon.Sinc…  相似文献   

2.
Asiswellknown,thetheoryfornonlinearpolymerizationswasinitiatedbyFloryandStockmayer[1—3].MillerandMacosko[4—6]proposedarecursivemethodfordealingwiththeproblemofthepostgelpropertiesofthenetworkformingpolymerization.Stepto[7]investigatedthegelgelreactionofRAft…  相似文献   

3.
BasedonthecrystalstructuredatafromXrayanalysis[1,2]andthespectralpropertiesofeachchromophoreofCPC[3,4],Sauerandcoworkers[5,6]expectedthatthedynamicsofenergytransferprocessesshouldtakeplacewithin10—30pstimescalebetweentwotrimersofCPChexamer.Furthermore,Zhaoandco…  相似文献   

4.
Recently,developmentandapplicationofdensityfunctionaltheory(DFT)arequiteattractivetoscientists’attention.Therelevantpapersareincreasingveryquickly[1—11].SincetheelectronegativityconceptwasproposedbyPauling[12]todescribethepowerofanatominamoleculetoattractel…  相似文献   

5.
毛江高  金钟声 《结构化学》1994,13(5):329-333
CrystalStructureof[La(NCS)_3(18-crown-6)(DMF)]MaoJiang-Gao(FujianInstituteofResearchontheStructureofMatter,AcademiaSinica,Fuzh?..  相似文献   

6.
BackgroundHydrogensulphide ,acolourless ,flammablegaswithacharacteristicrotteneggodour ,occursexten sivelyinanumberofnaturalandindustrialenviron ments .Forexample ,itsabundanceinsubsurfacehy drocarbonreservoirsunderanaerobicconditions[1]mainlyresultsfromthei…  相似文献   

7.
1 INTRODUCTIONSince1980,manyV/Fe/Sheterometallicsulfurclustercompoundshavebeenreported.RauchfussetalobtainedtwokindsofV/Fe/Scompounds[1]using(CH3C5H4)2V2S4asanorganometallicligand,oneis(MeCp)2V2Fe2(NO)2S4withacubanelikestructureandanotheris(MeCp)2V2S4Fe(NO)2and(MeCp)2V2S4…  相似文献   

8.
IntroductionWehavereportedthesynthesisofdicarbonyl ( η5 2 ,4 cyclopentadien 1 yl)tricyclo hexylstannylironanditscrystalstructureshowsthatthemetal metalbond ,Sn—Fe ,existsinthemoleculeofthecomplex[1] .As ( η5 2 ,4 cyclopentadien 1 yl)di carbonylironheteronuclearbimetal…  相似文献   

9.
Diazo compounds( 1 )andtheisomericdiazirines( 2 )areimportantsubstratesforsyntheticandmechanisticstudies ,particularlyforthestudyastheprecursorsofcarbenes[1] .CRR’N+ N-1CRR’NN2  Diazirinecompoundsdecomposeintonitrogenandthecorrespondingcarbenes .Forthethermaldec…  相似文献   

10.
IntroductionInclusioncompoundshavebeennotedinrecentyearsandresorcinol typecalix [4 ]arenehasbeenstudiedfortheirinclusionabilitiesbyScheiderandBugleretal[1— 3] .Thepolyolmoietiesincalix[4 ]re sorcinareneformrigidhydrogen bondingnetworks[4 ] ,andcalix [4 ]resorcinare…  相似文献   

11.
1 INTRODUCTIONThecoordinationchemistryofmulti substitutedoxamidesisofimportancetoawidevarietyofchemical[1 ] ,biological[1 ] andappliedsystems[2 ,3] .Themagnetic[4,5]andspectroscopic[6 ,7] propertiesoftheoxamidecomplexesareveryinteresting .Alotofmononuclearandbimetall…  相似文献   

12.
1 INTRODUCTIONInrecentyears ,triazolo[3,4, b] 1 ,3,4 thiadiazolederivativeshavebeenat tractingmuchattentionfromchemistsandpharmacologistsbecausetheyshowbroadspectraofbiologicalactivities,suchasinsecticidal[1 ] ,antifungal[2 ] ,herbicidal[3] ,an tibacterial[4] ,hypotensiv…  相似文献   

13.
IntroductionSeveralplantsofgenusAnaphalis(Compositae)havebeenphytochemicallystudied ,fromwhichflavanoids[1,2 ] ,helipyrone[3] ,chloroacetyleniccompoundswithadihydropyranorfuranring[4] andphthalideshavebeenreported[5 ] .A .sinicaHance ,distributedinChinaandalsofound…  相似文献   

14.
Metaloxidesareonekindofmaterialofimportantapplications[1,2].Fortheclustermodelingofmetaloxideswithquantumchemicalmethods,thewaysgointothreegroups[3,4],i.e.thebareclustermodel,thesaturatedclustermodelandtheembeddedclustermodel.Thebareclustermodelissimplyasmal…  相似文献   

15.
1 INTRODUCTIONTheα ,α ,α′,α′ tetraaryl 1 ,3 dioxolane 4,5 dimethanols (TADDOLS)diolswhicharereadilyavailablefromalkyltartrates ,havebeenwidelyusedaschiralligandsinenantioselectiveadditionreactionsofcarbon centerednucleophilestoaldehy des[1 ] ,in [2 +2 ]cycloadditions[2 ] …  相似文献   

16.
Recently ,thedynamicsofenergytransferprocessestakingplaceinsolutionshasattractedmuchattention[1] .Liuandhisco workers[2 ] studiedtheenergytransferinbinarycollisionofwatermoleculesandpointedoutthatthewater waterinteractionwas“particularlyinterestingduetotheh…  相似文献   

17.
IntroductionThiazolidino[3,4 c]oxazaborolidine ,asacatalyst,isusedintheenantioselectivereductionofprochiralke tones .1 4 AsshownintheexperimentbyLiandXie ,1thechiralityofreducedproductscatalyzedbythiazolidino[3,4 c]oxazaborolidineisoppositetothosebytheusualcat a…  相似文献   

18.
Noncovalentinteractionsplayadominantroleindeterminingthestructuresandfunctionsforbiologicalmacromolecules.Forexample,ligandreceptorinteraction,enzymesubstratebindingandantigenantibodyrecognitionareallrelatedtothenoncovalentinteractions[1].Comparedtothem…  相似文献   

19.
TheactivityofFe(naph)2Al(iBu)3CH2CHCH2Clcatalystishighinbutadienepolymerizationwithhydrogenatedgasolineassolvent[1].Thekineticsofthecatalysthasbeenstudiedasahomogeneouscatalyticsystem[2].However,thepreparativemethodsofthecatalystincludingratioandaddingordero…  相似文献   

20.
TheheteropolyanionphasetransferchemistrycreatedbyPopeM .T .in 1 984hasopenedupanewfieldforheteropolycompoundresearch[1— 3] .Butsubstitutingcoordinationwatermoleculesbyorganicopticallyactiveligandhasnotbeenreportedinliteraturesuntil 1 997[4] .This papercoverssixhet…  相似文献   

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