简介：Densityfunctionaltheory(DFT)calculationswerecarriedoutonthecompoundsCp2Ln-guanforLn=Y,Lu,Yb,DyandGd,[guan=(iPrN)2CN(iPr)2].TheresultswerecomparedwiththeX-raystructuresthatwereavailablefromtheliterature;thecalculationsreproducedquitewelltheexperimentalstructuralfeaturesinthesecomplexesexhibitingdistortedtetrahedrongeometry.ThecalculatedevolutionoftheLn-guanbondasafunctionofthecationshowedthatlanthanide-liganddistancesincreasedwiththeincrea...

简介：林(i-Pr)的一等价物的增加2或林(CH2)5到carbodiimides，RNCNR[R=cyclohexyl(Cy)，isopropyl(i-Pr)]，产生了tetrasubstitutedguanidinates的相应的锂{李[RNC(NR2)NR](THF)}2[R=i-Pr，NR2=N(i-Pr)2(1)，N(CH2)5(2)；R=Cy，NR2=N(i-Pr)2(3)，N(CH2)5(4)]。有他们的锂guanidinates的刚准备的答案的ZrCl4的处理向Zr的一系列二度(guanidinate)建筑群提供了一般公式Zr[RNC(NR2)NR]2Cl2[R=i-Pr，NR2=N(i-Pr)2(5)，N(CH2)5(6)；R=Cy，NR2=N(i-Pr)2(7)，N(CH2)5(8)]。建筑群1，2，58被元素的分析，红外和1H描绘NMR系列。建筑群的分子的结构1，7和8被X光检查衍射研究进一步决定。

简介：Thesixmultiimidazolecopper(Ⅰ)complexesareutilizedtomimictyrosinase.Themainproductis3,5-di-t-butylcatecholfromo-hydroxylationofthesubstrate2,4-di-t-butylphenol.Thehighestyieldofcatecholisupto82.2%andselectivity94.8%by[Cu(I)_(3b)(MeCN)_2](ClO_4)_2andO_2undermildconditions,whicharefoundtobemoreefficientthanthatalreadyreported.

简介：HydrolysisofDNAisanimportantenzymaticreaction,butitisexceedinglydifficulttomimicinthelaboratorybecauseofthestabilityofhydrolysisofDNA.Inthispaper,thecleavageactivityofcomplexesformedbetweenCu(Ⅱ)andfourdifferentaminoacidoraminoacidmethylesteronDNAisstudiedbygelelec-trophoresis.ItisfoundthatDNAcouldbecleavedbyCu(Ⅱ)-L-HisandCu(Ⅱ)-L-Hismethylestercomplexesandtheefficiencyofcleavageislargelydependentonthemetalion-to-ligandratio.FurtherexperimentsshowthatthecleavageofDNAmediatedbyCu(Ⅱ)-L-HiscomplexesoccursviaahydrolyticmechanismandtheactivechemicalspeciesthataffectsDNAcleavageisproposedtobeMI2H+andML2H22+.

简介：Sevennewμ-isophthalatodinuclearlanthanide(Ⅲ)complexes,namely[Ln2(IPHTA)(Me2-phen)4-(ClO4)2](ClO4)2(Ln=La,Nd,Sm,Eu,Gd,Ho,Er),whereMe2-phendenotes2,9-dimethyl-1,10-phenanthroline(Me2-phen),IPHTArepresentsisophthalatedianion,havebeensynthesizedandcharacterizedbyelementalanalyses,molarconductancemeasurements,IR,ESRandelectronicspectra.Thevariable-temperaturemagneticsusceptibilitiesof[Gd2(IPHTA)(Mez-phen)4(ClO4)2](ClO4)2complexweremeasuredinthetemperaturerangeof4-300KandtheobserveddataweresuccessfullysimulatedbytheequationbasedonthespinHamiltonianoperator,H=-2JS1·S2,givingtheexchangeparameterJ=-0.19cm-1.Thisresultiscommensuratewithaweakantiferromagneticspin-exchangeinteractionbetweenGd(Ⅲ)-Gd(Ⅲ)ionswithinthecomplex.

简介：SpectroscopicmethodsareusedtoinvestigatecoordinationstructureofN-picolylpolyurethanetransitionmetalcomplexes(PUPYM,M=Co^2+andNi^2+).Geometricalarrangementofligandsinfirst-shellcoordinationsphereofmetalionsispostulatedtobetetrahedralCoL2Cl2andoctahedralNiL2-Cl2Z2.whereListhepicolylgroupandZisahydrate.FromextendedX-rayabsorptionfinestructure(EXAFS)analysis,bondlengthsformetal-chlorineandmetal-ligandofPUPYMaresimilartothoseofsmallmolecularweighttransitionmetalcomplexes.Atwo-phasemodelofPUPYMwhichbestdescribestheexperimentaldataofDMTAandSAXS.isproposed.Onemicrophaseistheharddomainofselfsegregatedhaedsegmentsbroughtaboutbymetal-ligandinteraction.andtheotherphaseisthematrixofsoftsegments.Transitionmetalion-ligandmoietiesandtheirinteractionsdominatethemacroscopicthermalbehaviorofPUPYM.Theligandfieldstabilizationenergydifference(ΔLFSE)betweenmteald-electronsincomplexeswithtwopicolylligandsinthecoordinationsphereofmetalionsandcomplexesmaintainingonepicolylligandascoordinationpendentgroupiscalculatedonthebasisofobservedcoordinationstructure,anditrepresentstheenergysuppliedtosplitcoordinationcross-links.ΔLFSEofpolyurethanenickel(II)complexislargerthanthatofthecobalt(II)complex,Sincethemobilityofhardsegmentsisininverseproportiontothestrengthofcoordinationcross-links.ahigherα-transitiontemperatureofPUPYNi^2+withrespecttoPUPYCo^2+isfoundasexpected.

简介：Thephotochemicalpropertiesofpolypropylviologen(PPrV)-cationexchangeableresincomplexeswerestudies.Thecolorofthesecomplexeschangedtobluewhenirradiatedbyamercurylamp.UVandESRstudiesindicatedthatanefficientviologenradicalaccumulationoccursinPPrV-resincomplexes.Anexplanationforthestablephotoinducedredicalaccumulationisproposed.

简介：Reactionofchiral2,2’-biamino-1,1’-binaphthalene(Ror5)withmonosubstitutedporphyrin1band2b-caffordednovelchiraldiporphyrins3a-cand4a-c.Theirdimetalcomplexes[(M)2DiPor]havealsobeenprepared.BothstructureshavebeenidentifiedbyMS,IR,UV-visible,1HNMRspectraandelementalanalysis.Thesenovelchiralcompoundsshowveryhighopticalactivities.

简介：<正>Irtyshshearzoneisastretched,butrelativelynarrownearfaulttectoniczone,whichischaracterizedbythefollowingfeatures:a)generalsturctureanisotropy(310-320o)withpre-dominanceofsymmetricalrelationshipsofplanarandlineartypes;b)predominantdevelop-mentofbendedblastomyolnite,blastocataclasiteandmetamelangefomations;c)regional,butnon-uniformfoliationofricksandgeneralmanifestationofstructuresoftheshearingflow;d)separationofnumerouslensesofmingmatite-likeandpegmatoidformations,smallintrusionsofleucocraticgranites,granite-porphyresandgranite-aplitesanddike-likebodiesofgabbro-dyabaesandultrabasicrlcks,rarely.

简介：TheinteractionsofLa(Ⅲ),Pr(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ),andYb(Ⅲ)withcytosine,5-bromocytosine,5-azacytosineand5-flurocytosineasprimaryligands(L)andguanine(A)assecondaryligandforbothbinary(1:1)aswellasternary(1:1:1)systemswereinvestigatedbypotentiometricequilibriummeasurementsat25,35and45℃inaqueoussolution(ionicstrength,μ=0.1mol·dm-3NaNO3).Thestabilityconstantsofthebinary(1:1)andternary(1:1:1)metal-ligandcomplexesfollowthefollowingorderLa＜Pr＜Nd＜Sm＜Eu＞Gd＜Dy＞Yb.ResultsalsoindicatethattheternarylanthanidecomplexesofLa(Ⅲ),Pr(Ⅲ),Nd(Ⅲ),Sm(Ⅲ),Eu(Ⅲ),Gd(Ⅲ),Dy(Ⅲ),andYb(Ⅲ)aremorestablethancorrespondingbinarylanthanidecomplexes.Theenthalpy(Δhof)andentropy(Δsof)changesfortheformationofbinaryandternarycomplexeswerecalculatedfromtemperaturecoefficientdata.TheΔΔSofvaluesarepositiveforallthemetalligandsystems.ThenegativeΔΔHofvaluesindicatetheextrastabilityoftheternarycomplexesbytheexothermicenthalpychanges(ΔΔSof=ΔTSof-ΔBSofandΔΔHof=ΔTHof-ΔBHofwhereΔTSof,ΔTHofandΔBSof,ΔBHofaretheentropyandenthalpyvaluesassociatedwiththeternaryandbinarycomplexes,respectively).ItwasalsoproposedthattheguanineisbondedtometalionsthroughN1/C6=OandN7whereascytosineanditsderivativesarebondedthroughN3atomsinternarycomplexes.

简介：Thecharacteristicsofstyrene-acrylicacidcopolymersupportedlanthanidecomplexes(SAACLn)(Ln=La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tin,Yb,andLu)weredescribed.AcomparisonoftheactivitiesofSAAC·Lnwasmade.Itwasfoundthatinthepolymerizationofbutadiene,apeakinactivityappearedatNdandPr,Sin,Euandtheheavylanthanidesexhibitedlowornoactivities.Theeffectsofsomefactorsontheactivitieswerediscussed.Themicrostructureofthepolymersobtainedwithallthelanthanidesintheserieswerethesameandthecontentofcis-1,4polybutadieneattainedwasmorethan98%.

简介：Fivenovelcomplexesofformula[Ln(hfac)3]·BNPhOM,whereLn=Gd,Ho,Dy,Y,Er;hfac=hexfluoracetylaceto-nate;BNPhOM=1,3-[bis-2,2’-(4,4,5,5-tetramethyl-4,5-di-hydro-1H-imidazolyl-1-oxyl-3-oxide)phenoxy]propane,havebeenpreparedandcharacterizedbyelementalanalysis,molarconductances,IKandelectronicspectra.ThetemperaturedependenceofthemagneticsusceptibilityforGd(III)andradicalwasmeasured(2-300K).TheobserveddataweresuccessfullysimulatedgivingtheexchangeintegralJ=0.28cm-1,J’=-0.33cm-1.TheseresultsindicateaweakferromagneticspinexchangeinteractionbetweenGd(III)ionandtheradicalandaweakantiferromagneticspinexchangeinteractionbetweentheradicalandradical.

简介：TheSOD-likeactivityoffiveCu(Ⅱ)complexes[Cu(HSal)_2·EtOH,Cu(Gly)_2,Cu(Lys)_2,Cu(His)_2,Cu(Try)_2]havebeenstudiedbyusingcytochromeCmethod,aswellaschemilumine-scenceandESRtechnique.Thefoursurfactants(CTAB,SDS,TritonX-100andTween20)werepurifiedandtheircriticalmiceileconcentration(CMC)inphosphatebuffer(pH=7.4)wasmea-sured.TheeffectsoffoursurfactantsonO_2~-havebeeninvestigated.Theco-operativeeffectsof

简介：Thepropertiesofimmobilizedglucoseoxidase(GOD)bythecomplexesofdiethylaminoethylcellulose(DEAEC)withdifferentpolymers,suchaspolymethylacrylicacid(PMAA),polyacrylicacid(PAA),polystyrenesulfonicacid(PSSA),polyvinylaleohol(PVA),polyethyleneoxide(PEO)andstyrene-maleicacidcopolymer(PSMA)wereinvestigated.TheactivityofimmobilizedGODwasobviouslyinfluencedbythecomponentoftheDEAECcomplexes.TherelativeactivityoftheimmobilizedGODreachedtomaximumandover90%ofthenativeGOD.whentheDEAEC-PMAADEAEC-PAAcomplexeswereusedasacarrierwiththemolarratioofDEAECandpolyacidofaboutone.Michaelisconstants(Km)oftheimmobilizedenzymesofDEAEC-GOD-PMAAandDEAEC-GOD-PAAweredeterminedtobe1.25and1.00,respectively.Moreover,theimmobilizedGODhasagoodstoragestabilityandcycliclife.

简介：FifteennewpolyesterligandswerepreparedbycopolymerizationofEDTA(ethylenediaminetertraaceticacid)dianhydrideorDTPA(diethylenetriaminepentaaceticacid)dianhydrideanddihydricalcoholordihydricphenol.Theirparamagneticmetalcomplexeswerealsosynthesized.Allpolyesterligandsandmetalcomplexeswerecharacterizedby^1HNMR,IRspectraandelementalanalyses.Preliminarystudyshowedthatthepolyestermetalcomplexeshadhigherrelaxationeffectivenessascomparedtocorrespondingsmallmolecularmetalcomplexes.

简介：ＳｙｎｔｈｅｓｉｓａｎｄＭａｇｎｅｔｉｃＰｒｏｐｅｒｔｉｅｓｏｆＢｉｎｕｃｌｅａｒＣｏｂｌａｔ（Ⅱ）ＣｏｍｐｌｅｘｅｓｗｉｔｈＡｌｋｏｘｉｄｅＢｒｉｄｇｅＹＡＮＳｈｉ－ｐｉｎｇ，ＰＥＮＧＪｉｕ－ｈｅ，ＬＩＡＯＤａｉ－ｚｈｅｎｇ，ＪＩＡＮＧＺｏｎｇ－ｈ...

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简介：ＩｎｔｒｏｄｕｃｔｉｏｎＡｖａｒｉｅｔｙｏｆｎｅｗｐｏｌｙａｍｉｎｏｐｏｌｙｃａｒｂｏｘｙｌａｔｅｌｉｇａｎｄｓａｎｄｔｈｅｉｒｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｈａｖｅｂｅｅｎｓｙｎｔｈｅｓｉｚｅｄｉｎｒｅｃｅｎｔｙｅａｒｓｂｅｃａｕｓｅｏｆｔ...