简介：Theelectrochemicaloxidationofdiphenylamineinacetonitrileproducesanadherentuniformpolymerfilmwhichexhibitsmutiplecolourvariation(yellow-green-blue)inawiderangeofpotentialscan.Thepolymerizationmechanismandthestructureofthepolymerwerestudiedbycyclicvoltammetry,FT-IRandinsituESR.Theresultsindicatethattheelectrochemicalpolymerizationofdiphenylaminebelongstoacationicradicalpolymerizationprocess.Duringelectrolysis,onlyoligomerswereinitialyproduced,thenpolymerfilmwasformedontheelectrodesurface.Theelectropolymerizationperformsviathe4,4’C-Cphenyl-phenylcouplingmechanism.

简介：ThesurfacecompositionandelectronicstructureoftungstencarbidespreparedbydirectsynthesisandcarburizationofwhitetungsticacidwerestudiedwithX-rayphotoelectronspectros-copy.TheexperimentalresultsshowthatWO3andfreecarbonarepresentonthesurfaceofthecarbides.Forthehighsurfaceareatungstencarbidepreparedfromwhitetungsticacidalargeextentofoxygeninsertionintothecrystallatticewasobserved.MeasurementsofthebindingenergiesoftheW47/2,C1sandO1scorelevelsindicatethatchargetransferisfromtheWtotheCandOatoms,formingW5d-C2pandW5d-O2pbonding.ThecatalyticbehaviorofthetungstencarbidesinhydrocarbonconversionreactionsismentionedandcomparedwithPtcatalysts.

简介：［1］BASFUSP4479906［2］BASFBP1443541［3］BASFDE3618265［4］WangL.,WuZ.,ChinaLeather,26(8),11,(1997)［5］YuanL.,DinY.,ChineseChemistryBulletin,(2),19(1988)［6］KurokiH.,ChemistryofDyeingTheory(ChineseTranslation),TextileIndustryPress,Beijing,89(1982)［7］WangS.,LiP.,WuZ.DyestuffIndustry(Chinese),34(4),1,(1997)［8］Tian,Y.,Wu,Z.,Wang,G.,Zhang,S.J.ChineseChem.Eng.,46,156(1995)［9］Tian,Y.,Wang,G.,Wu,Z.,J.ChineseChem.Eng.,47,75(1996)［10］Lycka,A.,DyesandPigment,32,11(1996)［11］Griffith,J.,ColourandConstitutionofOrganicMolecules,AcademicPress,London,191(1976)

简介：Ringinversionofeightsubstituted2-phenyl-4,4-dimethyloxazolidinesino-dichloro-benzene-d4wasstudiedbyHDNMR.Veryhighinversionbarriers(/nGc/n=86.7—93.4kJ·mol-1)werefoundfortheseoxazolidinerings.Themagnitudeoftheinversionbarrierisdependentonthepolarityofthesubstituentonthephenylgroup.Alinearcorrelationispresentbetweenthe/nGc/noftheinversionandthesubstituentconstant,σ+,ofthesubstituent.

简介：Phosphatdylcholinesandtheiranalogs,thefunctionalbuildingblockofthemembrane,arerecentlyfoundtomediatemultiplephysiologicalprocessesandexhibitabroadrangeofdesirablepharmacologicaleffects,whichinvolvehydrophobiclipophilicinteractions(HLI)betweenthephospholipidandthecellmembrane.TheHLIbehaviorofphosphatJdylcholines(Ln)andtheiranalogues1,2-diacyl-sn-glycerol-3-phosphoricacidbromoethylester(Pn),havebeeninvestigatedinMeOH-H20binarysystemsofdifferentvolumefractions(designatedasΦ)oftheorganiccomponent,byemployingα-nephthylethyllaurylether(Np-12)asfluorescentprobe.AveryinterestingobservationisthattheLnpossessesdoublecharacter,i.e.,itbehavesbothasanaggregatorandasadeaggregator.Theeffectsofthestructureandtheenvironmentonthecoaggregationanddeaggregtionarealsodiscussed.

简介：Experimentaldataofhydrolyticpolymerizationoflanthanideionsinaqueoussolutionweretreatedbygraphicmethod,computerfittingandpqanalysis,speciespresentwereascertainedandhydrolysisconstantsobtained.Ln（OH）2+andLn2（OH）24+predominatedinthespeciesofallhydroly-sisproducts.Whenthefirstandthesecondhydrolysisconstantswereplottedagainstradiiandef-fectivenuclearchargeoflanthanideions,thecurvesobtainedconformedwiththe“three-divisiongroups”rule.CorrelationbetweenhydrolysisconstantsofLn2（OH）24+andotherhydrolysisconstantsislinear.Usingtheaboveempiricalcorrelationswecalculatedhydrolysisconstantsofalllanthanideionsandobtainedsatisfactoryresultswhichshowedgoodregularityforhydrolysisoflanthanideionsandthussystematizedalldataofthereaction.

简介：在allosteric酶和底层之间的有约束力的过程上的使活跃之物分子和压抑的分子的效果被考虑绑在allosteric酶的调整分子的heterotropic效果讨论。有heterotropic效果的allosteric酶的一个模型被介绍。在规定过程的cooperativity和anticooperativity被学习。

简介：Theinfraredmulti-photondissociation（IRMPD）ofaceticanhydridetogeneratestate-selectedCH2hasbeeninvestigatedbyusingtimeandwavelengthresolvedfluorescencetechniques.IthasbeenobservedthatthegenerationofthenascentgroundstateCH2（a1A1）isdelayedbyabout0.6μsrelativetotheonsettimeoftheexcitedCH2（b1B1）.TherelativepopulationofthegroundandexcitedstateCH2andtheonsettimefortheappearanceofthegroundstateCH2havebeenfoundtodependstronglyonCO2laseroutputfluences.TheseresultsappeartohaveastrongbearingonthestructureofthepotentialenergysurfacesoftheintermediateCH2CO.Apossiblephotolysisme-chanismisproposedtoexplaintheseexperimentalresults.

简介：TheNMRmethods(including1HNMR,13CNMR,variabletemperaturemethodandthenovel1DEXSYtechnique)wereemployedtostudytheconformationofazacrownethers1-5insolution.Therearetwoclassesofconformationinwhichtheazacrownethersexistinsolutionac-cordingtotheirmolecularstructure.Twokindsofintramolecularmotionoftheazacrownetherswereobserved,oneisthevibrationofthemacrocyclicringandtheotherisitsinversion.TheetherringswhichcontainoxygensaremoreflexiblethanthatconstructedbynitrogensinthepresentcasebecauseofthetetrahedronstructureofthenitrogenatomsandthehindranceofthegroupsTsconnectedtothenitrogens.Somethermodynamicalparametersoftheringinversionprocesswereobtained.

简介：Vesiclecanbepreparedfromaqueousmixturesofsimplecommerciallyavailable,single-tailedcanonicandanionicsurfactants.Inthiswork,theI3/I1value,Ie/Imvalue,andfluorescencelifetimeofpyreneindifferentsystems(seethepreparationofsamples)weredetermined.Hieessentialaffectingfactorsintheformationofvesiclecanbededucedfromtheobtainedresults.Itshowedthatlargevesiclemustformnaturallybeforesonicationin0.082MoctyltrimethylammoniumbromideandsodiumlauratepH=9.2aqueoussolution.Whileaftersonication,onlysmallvesicleexists,whichcanbeprovedfurtherthroughelectronmicroscope.

简介：TwopossiblereactionmechanismsofVS~+(~3∑~-,~1Γ)withCOinthegasphasehavebeenstudiedbyusingB3LYP/TZVPandCCSD(T)/6-311+G(3dr,3pd)methods:theO/Sexchangereaction(VS~++CO→VO~++CS)andtheS-transferreaction(VS~++CO→V~++COS).Thetworeactionsproceedviatwo-stepandone-stepmechanism,respectively.ThebarriersofthetripletandsingletPESsare30.6and50.9kcal/mol,respectively,forO/Sexchangereactionand7.3and50.2kcal/mol,respectively,fortheS-transferreaction.Theresultsindicatethatthetripletgroundstatereactionismorefavorable,andtheS-transferreactionismorefavorablethantheO/Sexchangereaction,whichisingoodagreementwiththeexperimentalobservation.

简介：

简介：TheinfluenceofthesurfacestateofthegraphitefurnaceatomizerontheatomizationofhydrideshasbeenstudiedbymeansofsurfacefilmcoatingandquantumchemistryCN-DO/2calculations.TheresultsofthestudyprovethattheatomizationofAsH3,SbH3andBiH3inthegraphitefurnaceatomizerisnotasimplegasphasepyrolyticprocess,butasurfacecatalysispyrolyticprocess.

简介：Adetectionofanthracyclineantitumordrugdaunomycin(DNR)reactingwithDNAinsimulatemetabolisminvitrohasbeenmade.ItwasfoundthatDNRcouldreactwithDNAtoformDNR-DNAadducts.TheadductcompositionsofDNRwithfishspermDNAandthermallydenaturatedDNAweredetermined.TheequilibriumassociationconstantKofDNRwithfishspermDNAis1.98×10^5L/molandthatofDNRwithdenaturatedDNAis2.29×10^4L/mol.Semiquinonefreeradicals,metabolicproductsofDNR,candestroybothfishspermDNAanditsthermallydenaturatedDNA.ItisverifiedbyhyperchromiceffectincreaseobservedinUVspectrumandAFMexperiments.ThemechanismofDNAdegradationhasalsobeeninvestigated.Resultsobtainedallowonetoexplainthereasonofsideeffectofanthracyclinedrugandgivethewaytodepress,whichwereofclinicalsignificance.

简介：AvohammetricstudyoftheinteractionofneutralRed(NR)withDNAatagoldelectrodeinaphosphatebuffersolutionisdescribed.AfteraddingDNAinanNRsolution,thereductionpeakcurrentofNRdecreases.ThebindingmeehahismsofNRtoDNAindifferentpHrangesaredifferent.ThereductionpeakpotentialofNRinapH7.0phosphatebuffersolutioninthepresenceofDNAshiftspositively,indicatingthatthebindingofNRtoDNAisintercalationaction,butatpH=6.0thereductionpeakpotentialofNRshiftsnegatively,indicatingthatthebindingofNRtoDNAiselectrostaticaction.TheformedcomplexesareDNA-NRwhen[NR]/[DNA]<0.18andDNA-3NRwhen[NR]/[DNA]>0.35,respectively.

简介：硅上的银种子在房间温度通过水的HF和AgNO3答案被准备。为了探索银的形成过程，在硅上播种，有时间(OCP-t)的开的电路潜力的方法，阳极的脱衣打扫voltammetry(ASV)和扫描通道显微镜(STM)在这个工作被使用。银原子核长成大粒子的过程被电镀物品否定性解释。硅上的银种子的生长机制被介绍了：起初，银单层并且多层没有充分在损坏硅由于从硅吸引电子的银种子蚀刻的情况下盖住表面，第一成长到硅上在那以后，单层一起联合，有扩散进硅的一些银原子的形成的连续谷物电影并且多层仍然同时变得厚。

简介：

简介：为用离子层析在水里决定化学的氧需求(货到付款)价值的一个新方法结合了nanoTiO2-K2S2O8共存系统被描述。photocatalytic氧化系统和nanoTiO2-K2S2O8共存系统能降级水里的有机化合物。在反应答案的所有包含硫的种类最后被转变到能被传导性察觉者在离子层析决定的硫酸盐。硫酸盐的电导率的变化与货到付款价值成正比。最佳的试验性的条件和察觉的机制被讨论。申请范围是10.0300.0mg?????贃??????踖????????┟???????????釱吗？？

简介：Theacylationof3-pentanoneenaminewasstudiedandanovelformationof4-pyronesfromβ-diketoneenolesterswasfoundinvolvinganintramolecularO-toC-acylshiftfollowedbycyclization.

简介：Anewthermokineticreducedextentmethodforstudyingofthereversiblecompetitiveinhibitionofsinglesubstrateenzyme-catalyzedreactionswasproposedinthispaper.Thereactionthatarginase-catalyzedhydrolysisofL-argininetoL-ornithineandureaandtheinhibitionofthisreactionbytheproduct,L-ornithine,andexogenousL-lysinewerestudiedat37℃in40mmol·L^-1sodiumbarbiturate-HC1buffersolution(pH=9.4).MichealisconstantKmforarginineandmaximumvelocityVmofthereactionweredeterminedtobe5.14mmol·L^-1and1.13×10^-2mmol·L^+1·s^-1,respectively.TheproductinhibitionconstantKpandinhibitoryconstantK1ofL-lysineweredeterminedtobe1.18and5.6mmol.L-l,respectively.Alltheresultshavebetterrepeatabilityandself-consistencyandareinagreementwithliteraturevalues.Thisnewmethodusingmoredirectthermalinformationfromtheprocesswouldgivemorereliablekineticinformationthanthetraditionalinitialratemethod.