简介:NOVELOXIDATIONOFHEXABENZYLHEXAAZA-ISOWURTZITANEBYMe2CHNO2/CuCl/Py/O2XiaoPeiGUAN;HongYAN;JianGuangSUN;YongZhongYU(ScholofChe?..
简介:ThecharacteristicsofsuspendedsedimentimagecanbereflectedbythecoefficientsofbiorthogonalwavelettransformofCDF(2,2).Basedonthepowerdistributionindifferentscales,anadaptivealgorithmisproposedinthispaper,wherebythecoefficientsareadjustednon-linearly.Theparticleinformationcanbewellretainedwhiletheuselessbackgroundisremoved.Inthisway,satisfactorybinaryimagecanbeobtainedforfurtheranalysisofthesedimentparticle.
简介:Twooxo-vanadium(IV)complexes,[VO(C2O4)(2,2′-bipy)(H2O)]·C2H5OH(1)andVO(C2O4)(phen)(H2O)(2),where2,2′-bipy=2,2′-bipyridyl,phen=1,10-phenanthroline,weresynthesizedaspotentialfunctionalmodelsofvanadiumhaloperoxidases(VHPOs)inmixedsolventofethanolandwateratroomtemperature.Thecomplexeswerecharacterizedbyelementalanalysis,infrared(IR),UV-VisandX-raycrystallography.Structuralanalysesshowedthatvanadiumatomwascoordinatedbyaterminaloxygen,oneoxygenatomfromcoordinatedwater,twooxygenatomsfromthecarboxylategroupofoxalicacid,andtwonitrogenatoms(N1andN2)from2,2′-bipy/phen.Centralvanadiumatomsincomplexes1and2werebothinadistorted-octahedralenvironment,andsomeintermolecularhydrogenbondinglinkageswerealsoobservedineachcomplex.BrominationreactionactivityofthetwocomplexeswasevaluatedwithphenolredasorganicsubstrateinthepresenceofH2O2,Br-andphosphatebuffer,indicatingthattheycanbeconsideredasapotentialfunctionalmodelofVHPO.Inaddition,thermalanalysiswasalsoperformedanddiscussedindetail.
简介:Thecombinationofboth4,4′-bipyridine(4,4′-bipy)anddihydrogenphosphateanionligandswithcopper(Ⅱ)resultsintheformationofanovellayeredcompoundCu(4,4′-bipy)2(H2PO4)2(H2O)2.ThecrystalstructurecomprisesdiscreteneutralCu(4,4′-bipy)2(H2PO4)2(H2O)2units.Thecopperatom,locatedonthecrystallographictwofoldaxis,iscoordinatedwithtwonitrogenatomsofterminal4,4′-bipyligandsandtwowatermoleculesattheequatorialpositions,andtwodihydrogenphosphateoxygenatomsattheaxialpositions,forminganelongatedoctahedron.Thecomplexisatwo-dimensionaldistortedrhomboidalnetworkpossessingtwokindsofrhomboidswithdimensionsofca.1.6792nm×0.3203nmand1.2778nm×0.3198nm,respectively.Thetwo-dimensionalnetworksarestackedparallellyoneachotheralongc-axistogiveanextendedthree-dimensionalchannelnetworkwithaninterlayerdistanceofca.0.5030nm.Crystaldata:triclinic,spacegroupP-1,a=1.0253(2)nm,b=1.4501(3)nm,c=0.79715(16)nm,α=97.91(3)°,β=90.99(3)°,γ=85.54(3)°,V=1.1703(4)nm3,Z=2,R=0.0892,wR=0.2451.
简介:Thearomatizationoflightalkenesinliquefiedpetroleumgas(LPG)withandwithoutdimethylether(DME)additioninthefeedwasinvestigatedonamodifiedZSM-5catalyst.Theresultsshowedthatunderthegivenreactionconditionstheselectivityofalkenestohigh-octanegasolineblendingcomponentswasmarkedlyenhancedandtheformationofpropaneandbutaneswasgreatlysuppressedwiththeadditionofDME.ItwasalsofoundthatthedistributionofC5+componentswaschangedalotwithDMEadditionintotheLPGfeed.Theformationofbranchedhydrocarbons(mainlyC6C8i-paraffin)andmulti-methylsubstitutedaromatics,whicharehighoctanenumbergasolineblendingcomponents,waspromotedsignificantly,whilethecontentofn-paraffinsandolefinsinC5+componentswasdecreasedobviously,indicatingthatinadditiontotheoligomerization,cracking,hydrogen-transferanddehydrogenation-cyclizationofalkenes,themethylationoftheformedaromaticsandolefinsintermediatesalsoplaysanimportantroleindeterminingtheproductdistributionduetothehighreactivityofsurfacemethoxygroupsformedbyDME.Andthisprocess,incombinationwiththesyngas-to-methanol/DMEtechnology,providesanalternativewaytotheproductionofhigh-octanegasolinefromcoal,naturalgasorrenewablerawmaterials.
简介:Theepoxideisakindofversatileintermediateformanufactureofawidevarietyoffinechemicals.Thegoalofmodemefficientcatalyticmethodsistoproducedesiredcompoundswithhighyield,selectivity,lowcost,safety,operationalsimplicityandmoreimportantlyenvironmentallybenignmanner.However,therearevariousoxidants,whichareoftenhazardousorexpensive,beingusedforbothlaboratoryandindustrialepoxidation.Hydrogenperoxide(30wt%)solutionisthoughtasoneoftheidealoxidantsbecausewaterisasoletheoreticalsideproduct.Meanwhiletheepoxidationofstyreneisatypicaloneamongolefins.Here,theperformanceofstyreneepoxidationwasstudiedwithhydrogenperoxidesolutioncatalyzedbyCo(Ⅱ)phenanthrolinecomplexencapsulatedinsupercagesofMCM-41.
简介:Inthiswork,anewphotocatalytsIn(0.1),Cu(x)-ZnS(x=0.01,0.03,0.05)issuccessfullysynthesizedusingsimplehydrothermalmethod.ThephysicalandchemicalpropertiesoftheInandCuco-dopedZnSphotocatalystwerecharacterizedbyX-raydiffraction(XRD),fieldemissionscanningelectronmicroscopy(FESEM),diffusereflectanceUV-visiblespectroscopy(DRUV-visible)andphotoluminescencespectroscopy(PL).Thephotocatalyticactivityoftheas-preparedInandCuco-dopedZnSforhydrogenproductionfromwaterwithNa2SO3andNa2Sassacrificialagentundervisiblelightirradiation(λ≥425nm)wasinvestigated.Thepresenceofco-dopantsfacilitatedtheseparationofelectron-holeaswellasincreasesthevisiblelightabsorption.Theabsorptionedgeoftheco-dopedZnSphotocatalystshiftedtolongerwavelengthastheamountofCuincreases.ThisindicatesthattheabsorptionpropertiesdependedontheamountofCudoped.ThephotocatalyticactivityofsingledopedIn(0.1)-ZnSwassignificantlyenhancedbyco-dopingwithCuundervisiblelightirradiation.ThehighestphotocatalyticactivitywasobservedonIn(0.1),Cu(0.03)-ZnSwiththehydrogenproductionrateof131.32μmol/hundervisiblelightirradiation.Thisisalmost8timeshigherthansingledopedIn(0.1)-ZnS.
简介:Anon-linearoptical(NLO)materialwassynthesizedbymeansofasimplemethod.Thismaterialcanbeappliedinelectro-optical(EO)devices,suchasEOswitchesandmodulators.TheDisperseRed1(DR1)wasdopedinpolymethyl-methacrylate-co-glycidylmethacrylate(PMMA-co-GMA)astheNLOactivechromophore.Thesynthesisprocessandmaterialstructurewereexpressed.Thethermalproperties,surfacemorphologyandopticalcharacteristicsofthematerialwereinvestigatedbymeansofdifferentialscanningcalorimetry(DSC),thermogravimetricanalysis(TGA),atomicforcemicroscopy(AFM),andm-linestechnique.Usingthereflectiontechnique,thevalueoftheelectro-opticalcoefficientγ33wasmeasuredas11pm/Vatawavelengthof1310nm.AnEOswitchwithnanosecondresponsebasedonthismaterialhasbeenfabricated.
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