简介：Itiswellknownthatelectrochemicaloxidationofanilinedissolvedinelectrolytesolutionsisaveryusefulmethodforpreparingpolyanilinefilmsonelectrodes’.However,itisverydifficultforthismethodtoprepareauniformmonolayerpolymersincelocalnucleationandgrowthofpolyme...
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：4-(Succinimido)-1-butanesulfonicacidasanefficientandreusableBronstedacidcatalyzedthesynthesisofpyrano[4,3-b]pyranderivativesundersolvent-freeconditions.Thecatalystcanbepreparedbymixingsuccinimideand1,4-butanesultonethatismoresimpleandsaferthanthepreparationofsuccinimidesulfonicacid.Thismethodhastheadvantagesofhighyield,cleanreaction,simplemethodologyandshortreactiontime.Thecatalystcouldberecycledwithoutsignificantlossofactivity.
简介：Anovelsupportedliquidphasefilmcatalyst:SupportedPdCl2-(n-C4H9)4N+Cl-moltensaltswasfoundtobeaneffectivecatalystwithgoodstabilityforselectivehydrodechlorinationofCCl2F2(CFC-12)toitsalternativesCH2F2andCHClF2.AdditionofCoCl2,GaCl3andCuCl2toPdCl2-(n-C4H9)4N+Cl-modifiesthecatalyticperformanceofsupportedmoltensalts.
简介：在水热条件下,制备了一种基于Keggin型多金属氧酸盐的银配合物[Ag（10）（NCA）4（PW9ⅥW3ⅤO（40））（H2O）4].通过元素分析、红外光谱和X-射线单晶衍射方法确定了该配合物的晶体结构.在合成过程中,3-（2-吡啶羧酸）酰胺-吡嗪配体（L）分解成烟酸NCA.结构分析表明：该化合物属于三斜晶系,P1空间群,晶胞参数a=1.18874（9）nm,b=1.24950nm,c=1.41103（10）nm,α=73.712（2）°,β=66.720（2）°,γ=83.467（2）°,V=1.8479（2）nm3,Z=1,R1=0.0731,ωR2=0.1974.配合物中含有一种六核银亚单元[Ag6（NCA）4]（2＋）,不同亚单元间通过配位水的氧原子连接形成一维双链结构,而一维双链进一步通过Ag—N键连接形成二维层状结构,二维层则通过[PW9ⅥW3ⅤO（40）]（6-）多阴离子形成最终的三维金属有机框架.标题配合物修饰的碳糊电极对H2O2和KNO2还原有好的电催化活性,而且该配合物对降解亚甲基蓝、罗丹明B分子有较高的光催化效率.
简介：ThepreparationoftwotypesofmolecularsievesAlPO4-11andMAPO-11isreported.Theparticlesizeofthelatterishundredsofmicrons,about10timeslargerthanthatoftheformer.TheXRD,IRandDTAspectrahavedemonstratedthatmagnesiumhasbeenintroducedintotheframeworkofAlPO4-11.ThesuccessfulpreparationoflargesinglecrystalofMAPO-11willopenupanewareaforthepreparationoflargemolecularsievescrystalsinthefuture.ThelargeMAPO-11crystalcompoundisapromisinghostforthehost-guestassemblyofcompositematerials.
简介：Two-armedneutralanionreceptors(4,5),calix[4]arenesbeatingthioureaandamidebindingsites,werepreparedandexaminedtheiranion-bindingabilitybytheUV-visspectra.Theresultsofnon-linearcurvefittingandJobplotindicatethat4or5forms1：1stoichiometrycomplexwithfluoridebyhydrogenbondinginteractions.Receptors4and5haveanexcellentselectivityforfluoridebuthavenobindingabilitywithacetate,dihydrogenphosphateandthehalogenanions(Cl^-,Br^-,I^-).
简介：Threepairsofnovel2-aryl-3,4,5-trihydroxypiperidines(6–8andtheirenantiomers),thepiperidineanaloguesofthepyrrolidinealkaloidsradicamineAandradicamineB,werepreparedfromsixmemberedcyclicnitronesthroughaconcisetwo-stepprocedure,i.e.,Grignardreagentadditionanddeprotection.Thesenovelpolyhydroxylatedpiperidineiminosugarswereassayedagainst10typesofenzymes.Onlycompound8exhibitedweakinhibition(IC501080mmol/L)againstb-galactosidasefromratintestinallactases.
简介：Anovelflower-likehydratedmagnesiumcarbonatehydroxide,Mg_5(CO_3)_4(OH)_2·4H_2O,withmicro-structurecomposedofindividualthinnano-sheetswassynthesizedusingafacilesolutionroutewithouttheuseoftemplateororganicsurfactant.Reactiontimehasanimportanteffectonthefinalmorphologyoftheproduct.Themicro-structureandmorphologyofMg_5(CO_3)_4(OH)_2·4H_2OwerecharacterizedbymeansofX-raydiffractometry(XRD),field-emissionscanningelectronmicroscopy(FE-SEM).Brunauer-Emmett-Teller(BET)surfaceareasofthesampleswerealsomeasured.Theprobableformationmechanismofflower-likemicro-structurewasdiscussed.ItwasfoundthatMg_5(CO_3)_4(OH)_2·4H_2Owithflower-likemicro-structurewasanovelandefficientcatalystforthesynthesisofdiphenylcarbonate(DPC)bytransesterificationofdimethylcarbonate(DMC)withphenol.
简介：ThepossiblegeometricalstructuresandrelativestabilitiesofsemiconductormicroclustersGa.P.(n=1-4)werestudiedbyvirtueofdensityfunctionalcalculationswithgeneralizedgradientapproximation(B3LYP).ForthemoststableisomersofGa,,P.(n=1-4)clusters,theelectronicstructure,vibrationalproperties.dipolemoment,polarizabilityandionizationpotentialwereanalyzedbymeansofHF.MP2.CISDandB3LYPmethodswithdifferentbasissets.
简介：Thecrystalstructureof[Ni（TAAB）（py）2]（BF4）2,whereTAABisthetetradentatemacrocyclicligandtetrabenzo[b,f,j,n][1,5,9,13]tetraazacyclohexadecine,hasbeendeterminedfromX-raydiffractionanalysis.Thecrys.taibeiongstomonoclinic,spacegroupP21/nwithcellparameters
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