简介：Themonomericcobalt-phosphite-thiolatocomplex[Co(mpt)2{P(OCH3)3}2]BF4(Hmpt=2-mercaptothiazoline)hasbeenpreparedandcharacterizedbyX-raycrystallography.ThecomplexcrystallizesinthemonoclinicspacegroupC2/cwitha=0.8078(5),b=2.6020(18),c=1.2191(7)nm,β=99.38(1)°,V=2.528(3)nm3,andZ=4.Thestructurecomprisesdiscretecations[Co(mpt)2{P(OCH3)3}2.]+andanionsBF4-,inwhichthecobalt(Ⅲ)atomiscoordinatedtotwochelatempt-andtwoas-orientedmonodentateP(OCH3)3ligandsinahighlydistortedoctahedralgeometry.ThemostdistortedanglesareS(2)-Co(1)-S(2a)of162.23(10)°andN(1)-Co(1)-S(2)of71.47(13)°,thelatteriscausedbythegeometricconstraintofthebidentateligandmpt-.CyclicvoltammetryhasbeenusedtostudytheelectrochemicalbehaviorofthetitlecomplexontheRelectrodeinMeCNsolutionwith0.1mol·L-1ofBun4NBF4aselectrolyte.TheresultsindicatethatthetitlecomplexisunstableinMeCN.

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简介：Theoptimalconditionsforthecomplexationreactionofmeso-tetra(3-methoxy-4-hy-droxyphenyl)porphineT(3-M-4HP)Pwithplatinumandrhodiumarepresented.Beer’sLawisobeyedwhentheconcentrationofrhodiumisintherangeof0.45-1.15μg/25mL.Themolarabsorptivityofrhodiumwasfoundtobe1.99×106L·mol-1·cm-1at460nm.ThevalueofεPtwasfoundtobe6.28×105L·mol-1·cm-1bylinearregressionmethod.TheKcoefficientmethodandcompensatingcoefficientwereusedtodetermineplatinumandrhodiumsimultaneoulywithoutremovalormaskingoftheinterferentsinthesample.Theresultsforthedeterminationofplatinumandrhodiuminthemixedsolutionofplatinumandrhodiumaresatisfactory.

简介：RemanspectroscopyisusedasatooltomonitorthereactionbetweenN,N’-di（pmethyl）monothioxamidesand1,3-diaminetrimethyleneandtodetectthereactionintermediate.Byobservingchangesof1024cm-1C=Sbandandappearanceofanewbendataround1720cm-1,thereactionmechanismisdiscussed.

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简介：Anewμ3-Otriiron（Ⅲ）complex[Fe3O（OBz）6（CH3OH）3]（NO3）（CH3OH）2（HOBZ=benzoicacid）hasbeensynthesized,itsstructurehasbeendeterminedandvariabletemperaturemagneticsusceptilityhasalsobeenmeasured.Inthemolecule,threeironatomsformedanequilateraltrianglewithu3-Oincenter.ThefittingtothemagneticsusceptibilityshowedthatanintramolecularantiferromagneticexchangeinteractionoccurredbetweenironatomswithJ=-25.51cm-1,andaweakerintermolecularantiferromagneticexchangeinteractionoccurredwithzJ’=-2.30cm-1.

简介：ＴＨＥＲＥＡＣＴＩＯＮＯＦｐ－ＮＩＴＲＯＰＨＥＮＹＬＳＵＬＦＯＮＹＬＡＣＥＴＯＮＩＴＲＩＬＥＷＩＴＨα，β－ＵＮＳＡＴＵＲＡＴＥＤＥＳＴＥＲＳＡＮＤＮＩＴＲＩＬＥＳ￥ＧｕｏＲｅｎＹＵＥａｎｄＺｈｅｎｇＺｈａｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔ...

简介：Europium（Ⅲ）-dopedYF3ispreparedbyahydrothermalprocessat200℃.X-raydiffraction（XRD）patternidentifiestheformationofYF3phasewithoutdetectableimpurity.Environmentscanningelectronmicroscopy（ESEM）imageshowstheevensizedistributionofthesampleswithcubicmorphology.TheexcitationandemissionspectraoftherareearthionsdopedYF3areinvestigatedbyfluorescencespectrophotometer.Theexcitationspectrumfor591nmemissionhasseveralexcitationbandsat320,365,386,397and467nm,andthemainpeakvaluewas397nm.TypicalEu3+emissionpeaksat591nm（5D0→7F1）and612nm（5D0→7F2）areobservedwhenexcitedby397nm,andthestrongestemissionis591nm,demonstratingthattherareearthionsoccupythecentrosymmetricalsitesinYF3.

简介：[Co3(1,2-S2C6H4)3(PPh3)3][CoBr3(DMF)].sol(1,sol=CHCl3,O(C2H5)2,H2O)wasobtainedfromthereactionofCoBr(PPh3)3withNa2(S2C6H4)inchloroform.TheCo3coreinthecationof1exhibitsametal-metalbondedisoscelestriangle,inwhichthetwolongerCo-CobondsarebothbridgedbyS2C6H4ligandsontwosidesofthetriangleplanerespectively,whilethebottomshortCo-CobondisbridgedbythethirdbidentateS2C6H4ligand.Aseriesofpolynu-clearcobaltclustercompoundswithphosphine,thiolateand/orsulphurligandswerepreparedbylowoxidationstateCo+withthiolatesinorganicsolvents.Thesetri-,tetra-,hexa-,heptanuclearclustercompounds1-8withvarioustypesofcrystalstructurescanbeviewedasthecondensedpolynuclearcobaltcomplexesthatthecobaltatomframeworkswithsulphurbridgedwerebuiltthroughthesmalltriangularunitsof[Co3S3nL3](n=1,2)withorwithout[CoL](L=PR3,Br,Cl,5-C5H5)fragments.

简介：Reactionsofthe6-hydroxy-thiopyrano[3,4-c]pyridine-5-carbonitrilederivative1withα-halo-carbonylcompoundsgavetheortho-substitutedintermediates2a-cwhichwereconvertedintofuro[2,3-b]thiopyrano[4,3-d]pyridines3a-cbyfusionofafuranmoietyunderbasicconditions.Furthercyclizationof3a-cledtoafusionofapyrimidinering,yieldingthetetracyclicproducts6,7and8.Inaddition,condensationof6withvariousaromaticaldehydesaffordedthecorrespondingimines9a,b.Mannichreactionof7gaveproducts10a,b.

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简介：InanefforttoutilizeNMRtechniquefortheanalysisofthestructuralcomponentsofwoodandbiomassessuchaslignin,wemadeacomparativestudyoflignincontentsofseveraltypesoflignocellulosicmaterialsbothbeforeandafterenzymatichydrolyses.Tothisend,EucalyptusGlobulus,Norwaysprucethermomechanicalpulp(TMP)cornstoverandEucalyptuskraftpulpwereball-milledandtreatedwithcellulasetopreparematerialswithhighlignincontents.Thesematerialswereanalyzedvia31PNMRinionicliquids.Theresultsshowthatthecontentsofvariousfunctionalgroupsforthelignocellulosicmaterialsafterenzymatichydrolysesaregenerallyinagreementwiththosefromtheircorrespondingenzymaticmildacidolysisliginins(EMALs),indicatingthat31PNMRanalysisoflignocellulosicmaterialsinionicliquidsisapromisingmethodforquantitativecharacterizationoflignocellulosicmaterials.

简介：DrugsSPD-304(6,7-dimethyl-3-{[methyl-(2-{methyl-[1-(3-trifluoromethyl-phenyl)-1H-indol-3-ylmethyl]-amino}-ethyl)-amino]-methyl}-chromen-4-one)andzafirlukastcontainacommonstructuralelementof3-substitutedindolemoietywhichcloselyrelatestoadehydrogenatedreactioncatalyzedbycytochromeP450s(CYPs).ItwasreportedthatthedehydrogenationcanproduceareactiveelectrophilicintermediatewhichcausetoxicitiesandinactivateCYPs.DrugL-745,870(3-{[4-(4-chlorophenyl)piperazin-1-yl]-methyl}-1H-pyrrolo2,3-β-pyridine)mighthavesimilareffectsinceitcontainsthesamestructuralelement.Weusedmoleculardockingapproachcombinedwithmoleculardynamics(MD)simulationtomodelthree-dimensional(3D)complexstructuresofSPD-304,zafirlukastandL-745,870intoCYP3A4,respectively.Theresultsshowthatthesethreedrugscanstablybindintotheactivesiteandthe3-methylenecarbonsofthedrugskeepareasonablereactivedistancefromthehemeiron.ThecomplexstructureofSPD-304-CYP3A4isinagreementwithexperimentaldata.Forzafirlukast,thecalculationresultsindicatethat3-methylenecarbonmightbethedehydrogenationreactionsite.DockingmodelofL-745,870-CYP3A4showsapotentialpossibilityofL-745,870dehydrogenatedbyCYP3A4at3-methylenecarbonwhichisinagreementwithexperimentinvivo.Inaddition,residuesinthephenylalanineclusteraswellasS119andR212playacriticalroleintheligandsbindingbasedonourcalculations.ThedockingmodelscouldprovidesomecluestounderstandthemetabolicmechanismofthedrugsbyCYP3A4.

简介：以化学沉淀法制备单相的铕离子掺杂硼铝酸盐红色荧光粉YAl3（BO3）4：Eu3＋，考察了焙烧温度、掺铕量等因素对材料性能的影响，用X射线衍射、扫描电镜、激发光谱和发射光谱对荧光粉的结构、形貌和发光性能进行了表征．以尿素为沉淀剂，900℃焙烧沉淀前驱体可得到单相荧光粉YAl3（BO3）4：Eu3＋，反应温度比传统高温固相法降低了300℃；沉淀法制备的荧光粉粒径分布范围小，无团聚现象，粒径约300nm．掺铕量为10％（物质的量比）时发光强度最大．在260nIn的紫外光激发下，Eu3＋的5D0→F72的电偶极跃迁最强，发射光为618nm的红光．

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简介：探讨了氨基酸结构与ＲＮＡ中碱基三字密码间的关系，找到了与决定氨基酸相应碱基三字码的主要因素，指出决定氨基酸三字码的第１，２个码的碱基的亲水性要与氨基酸的亲水性相匹配，强亲水性的碱基与强亲水性的氨基酸相应；第２个码的碱基的亲水性是决定其亲水性的主要因素，而第１个码的碱基亲水必屯有相当的影响，每种氨基酸的碱基三字码个数的多少，以及三字码中第３个码为何种碱基，都与氨基酸的化学结构密切相关，特别是与Ｒ（Ｒ

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简介：ＥＬＥＣＴＲＯＮ　ＴＲＡＮＳＦＥＲ　ＢＥＴＷＥＥＮ　Ｅｕ３＋　ＡＮＤ　Ｃｅ３＋　ＩＮ　ＳｒＭｇＦ４　ＭＡＴＲＩＸＥＬＥＣＴＲＯＮＴＲＡＮＳＦＥＲＢＥＴＷＥＥＮＥｕ３＋ＡＮＤＣｅ３＋ＩＮＳｒＭｇＦ４ＭＡＴＲＩＸ￥ＹｉｎｇＷＵ；Ｃｈ...

简介：π-Conjugatedpoly(p-phenyleneethynylene)withtheinterruptionoftheconjugationbyabutyleneunitwassynthesized.Itsabsorption,PLandELspectrawereinvestigatedrespectively.Thespectralpeaksshiftedtothehigherenergysidewiththeinterruptionoftheconjugationlengths.Themodelcompoundwassynthesized,bywhichtheresultswereproved.ThethermalcharacteristicsofthepolymerwasdeterminedbyDSCandTGA,indicatingthatthepolymerhasagoodthermalstability.Theelectroluminescence(EL)inthegreenregionofthespectrumwithamaximumat500nmwasobservedfromthepolymerfilmssandwichedbetweenindium-tin-oxideandanAlelectrode.

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