简介:Sixnewcompounds,α,β-KaHb[GeW9M3(H2O)3O37].xH2O(M=Al,Ga,In;a+b=7)andα-K9H5[Ge2W18Ga6(H2O)3O74].20H2O,weresynthesizedfromthelacunaryprecursorsαandβ-GeW9O3410-andcharacterizedbyelementalanalysis,spectroscopyandelectrochemistry.Tungsten-183NMRspectraofthetitlecomplexesconsistoftwolineswithintensityratio2:1asexpectedfortrisubstitutedheteropolyanions.Theintensityratioofα-Gacompoundis1:2,whichisdifferentfromothers(2:1).WiththehelpofFABmassspectrum,weconcludedthatitisadimerwithD3h,structureinaqueous,andtheothersexistbymonomerswithC3cstructures.
简介:ThetitlecomplexEu(Ⅲ)(TTA)3(phen)(whereTTA=thenoyltrifluoroacetonemonoanion;phen=1,10-phenanthroline)hasbeensynthesizedinmixedsolventsofacetoneandethanol(1:1volumeratio)anditscrystalstructurehasbeendeterminedbyX-raydiffraction.Thecomplexcrystalsaretriclinic,spacegroupP1(#2)withcelldimensionsofa=1.3241(2)nm,6=1.5278(4)nm,c=0.9755(3)nm,α=92.49(2)°,β=102.57(2)°,γ=91.62(2)°,V=1.9268(8)nm3,Z=2,μ(MoKα)=18.77cm-1,Dx=1.720g/cm3.ThecoordinationgeometryofEuatomisadistortedsquareantiprism,andtheencapsulatedstructurethatcanmeetthestructuralrequirementofthetypicaleuropiumluminescentsensor.Thefluorescencespectrumsuggeststhatthecomplexisastrongphotoluminescentmaterial.
简介:ReactionsofCuSCNwithtetramethylthiuramdisulfideinCH3CNinthepresenceofstyreneandN,N,N',N',N'-pentamethyldiethylenetriaminegaverisetoanewcopper(Ⅰ)complexofN,N'-dimethyldithio-cabamate{[Cu(S2CNMe2)]2}n.ThetitlecompoundcrystallizedinthetriclinicP-1spacegroupwithlatticeparametersα=0.7610(4)nm,b=0.8911(4)nm,c=0.9268(5)nm,α=68.66(1)°,β=83.88(2)°,γ=79.31(2)°,V=0.5748(5)nm^3,Z=2.Thecompoundhasaunique1DchainstructurecomposedofCuSCSCuSCSeight-memberedringsandapairofCu-Sbonds,thestructureofwhichhasbeendeterminedbysingle-crystalX-raycrystallography.Theisolationofthiscompoundmayprovidesomehelpfulinformationforthecauseoftheinductionperiodsofthereverseatomtransferradicalpolymerization.
简介:Thesynthesisandspectrophotometricpropertiesof2-(6-methyl-2-benzothiazolylazo)-5-diethylaminophenol(MBTAE),andtheuseofitasaprecolumnderivatizingreagenttoseparateCo(Ⅱ),Ni(Ⅱ),Rh(Ⅲ)andIr(Ⅳ)complexesbyHPLCarediscussed.Whenthemobilephaseconsistsofmethanol/water(90/10Ⅴ/Ⅴ),acetatebufferwithpH4.0and5×10-5mol/LEDTAsolution,thefourcomplexesCanbeseparatedwithin9minonODScolumn.Thedetectionlimits(20μLsamplesize)are0.059ppb,0.062ppb,0.053ppband0.049ppbforCo(Ⅱ),Rh(Ⅲ),Ni(Ⅱ)andlr(Ⅳ)respectivelyatasignal-to-noiseratioof3.
简介:Aseriesof2’-purineandpyrimidinederivativesof1’,4’-anhy-dro-2’-deoxy-D-arabitol(1)and1’,4’-anhydro-2’-deoxy-D-altritol(2)weresynthesizedregio-andstereo-selectivelyfromD-sorbitolthroughsomeconversioninhighyields.
简介:AmicrocalorimetricmethodwasusedtoevaluatetheactionofYb^3+ionsonthegrowthmetabolismofStaphylococcusaureus.Thepower-timecurvesofthegrowthmetabolismofStaphylo.coccusaureusandtheactionofYb^3+ionswereobtainedbyus-ingstopped-flowmethodat37℃.Forevaluationoftheaction,thegrowthrateconstants(k1andk2)forthelogphase1,logphase2,andthetotalheateffect(Qtotal)forStaphylococcusaureusweredetermined.TheresultsshowthatYb^3+ionsatlowconcentrationshavethestimnlatoryeffectonStaphylococcusau-reusandthatYb^3+ionsathigherconcentrationcouldinhibititsgrowth.
简介:3-Mercaptopropionicacidmonolayerprotectedgoldnanoclusters(MPA-MPCs)weresynthesizedandcharacterizedbytransmissionelectornmicroscopy,UV-Visspectroscopy,X-rayphotoelectronspectroscopyandFourlertransforminfraredspectroscopy.Theexactvalueofquantizeddouble-layercapacitanceofMPCsinaqueousmediawasobtainedbydifferentialpulsevoltammograms.
简介:Thebilayerorganiclight-emittingdiode(OLED)withabluefluorescentlanthanumcomplex,tris(1-phenyl-3-methyl-4-isobutyryl-5-pyrazolone)-(2,2′-dipyridyl)lanthanum[La(PMIP)3(Bipy)],asalightemittingmaterialandN,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine(TPD)asaholetransportingmaterialemitsbrightgreenlightinsteadofbluelight.Thedataoftheabsorption,thephotoluminescence(PL)andthephotoluminescenceexcitation(PLE)spectraofTPD,La(PMIP)3(Bipy)andthemixtureofTPDandLa(PMIP)3(Bipy)(molarratio1∶1)provethattheelectroluminescentemissionoriginatesfromtheexciplexontheinterfacebetweenTPDandLa(PMIP)3(Bipy).Byimprovingdeviceconfigurationwithtris(8-hydroxyquinoline)aluminum(ALQ)asanelectrontransportingmaterial,amaximumluminanceof800cd/m2wasobtained.
简介:本文探讨(CH3Li)4中键的作用,通过计算,发现(CH3Li)4分子的面甲基结构比顶甲基结构要稳定;指出Li—Li间的成键作用相当强,约为Li2分子中键作用的40%左右,估计(CH3Li)4中的J7Li-6Li值约为1Hz。
简介:6/3-(4-Chlorophenyl)-s-triazolo[3,4-b][1,3,4]thiadiazoles(2a-e)and(5a-e)weresynthesizedrespectivelybyintermolecularcyclizationof5-aryl/4-chlorophenyl-4-amino-3-mercapto-1,2,4-triazoles(1a-e)and(4)with4-chlorobenzoicacid/arylacids,whichwerecondensedwithpiperazineunderphasetransfercatalystTBABtoyieldthecorrespondingfreebasesofmonopiperazinederivativesandfollowedtoformwater-solublesalts(3a-e)and(6a-e)withhydrochloricacidingoodyields.Theinvitrobiologicalresultsshowedthatpiperazinegroupconjugatedwiththeabovefusedheterocyclesplayedanimportantroleinantibacterialactivity.ThestructuresofnovelcompoundswereconfirmedbyIR,1HNMR,MSandelementalanalysis.
简介:ThephotodegradationreactionrateofCHCl3inTiO2particulatesuspensionwasimperovedsignificantlybyHCl-treatment.TheeffectofHCl-treatmentonthephotocatalyticactivityofTiO2wasstrdiedinaPECcellbyusingIntensity-ModulatedPhotocurrentSpectroscopy(IMPS).ThemagntudeofphotocurrentresponseandthecharacteristicfrequenciesoftheupperandlowersemicirclesinthecomplexplaneofIMPSresponsewereanalyzed,andtheccathodicandanodicreactionprocessesofphotogeneratedholesandelectronswerediscussed.Theincreasesinthecathodicandanodicphotocurrentresponseandinthetimeconstantsofbothcathodicandanodicreactionprocessesofphotogeneratedholesandelectronswerediscussed.TheincreasesinthecathodicandanodicphotocurrentresponseandinthetimeconstantsofbothcathodicandanodicreactionprocessesindicatethatHCl-treatmentleadstotheimprovementofthephotocatalyticactivityofTiO2andachangeofthephotocatalytickineticmechanism.
简介:2-Oxoderivativesofglycosides,called2-ketoglycosidesorglycoside2-uloses,arebiologicallyimportantincarbohydratemetabolismandareveryusefulinsynthesisofbranched-chainsugarsandaminosugars.Verylittleisknownoftheirchemistrybecauseofthehighsusceptibilityofthesecompoundstodegradationinsolution,andinparticulartheirinstabilitytobase.Thusitisimportanttostudythereactivitiesof2-ketoglycosides.Inapreviouspaper,wereportedthetransformationof2-ketoglycosidesinpyridinesolution.Duringthetransformationof2-and3-ketoglycosides,ademethoxylationreactionoftheenolintermediatewasshowntotakeplacesimultaneouslywitheliminationtogivehex-1-enopyran-3-ulose.
简介:Thecomplexes(PhCH2)2Sn(MBT)2(2)and(PhCH2)3Sn(MBT)(3)(HMBT:2-mercaptobenzothiazole)havebeensynthesizedandcharacterizedbyelementalanalyses,andIR,^1H,^13C,^119SnN-MRspectrometriesandX-raydiffraction.Studiesonthecrystalstructuresof2and3showthatHMBTactsasbidentateligandthroughchelationofNandSatoms.Complex2containsasix-coordinatetinatomwiththeaxialangleC(15)-Sn(1)-C(22)129.6(2)°.Andthetinenvironmentofcomplex3isadistortedcis-trigonalbipyramidwithC(8)-Sn(1)-N(1)158.80°.
简介:hePhotocatalyticcharacterizationofTiO2supportedonactivecarbonwasinvestigatedforphotocatalyticdecompositionofdichloroaceticacid.ItwasfoundthatTiO2/ACexhibitedahigherphotocatalyticactivitythanpureTiO2.ThereasonisthatactivecarbonactingaspowerfuladsorbentsupportsmakeshighconcentrationenvironmentsoforganicpollutantmoleculesaroundTiO2particles.
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.