简介：Cobaltandnickelcomplexes(1a-1dand2a-2d,respectively)supportedby2-imidate-pyridineligandsweresynthesizedandusedfor1,3-butadienepolymerization.ThecomplexeswerecharacterizedbyIRandelementanalysis,andcomplex1awasfurthercharacterizedbysingle-crystalX-raydiffraction.Thesolidstatestructureofcomplex1adisplayedadistortedtetrahedralgeometry.Uponactivationwithethylaluminumsesquichloride(EASC),allthecomplexesshowedhighactivitiestoward1,3-butadienepolymerization.Thecobaltcomplexesproducedpolymerswithhighcis-1,4contentsandhighmolecularweights,whilethenickelcomplexesdisplayedlowcis-1,4selectivityandtheresultingpolymershadlowmolecularweights.Thecatalyticactivitiesofthecomplexeshighlydependedontheligandstructure.Withtheincrementofpolymerizationtemperature,thecis-1,4contentandthemolecularweightoftheresultingpolymerdecreased.

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

简介：Novelpyrimidinenucleoside-3,5-dicyanopyridinehybrids(4)orpyridineattachedacylureas(5)wereselectivelyandefficientlypreparedfromthereactionof2'-deoxyuridin-5-yl-methylenemalononitrile(1),malononitrile(2)andthiophenol(3)orfromanunexpecteduracilring-openingandpyridinering-formingsequenceviathereactionof1and3.Itisthefirsttimesuchasequencehaseverbeenreported.

简介：Thegeometricalstructuresof2-(2-hydroxyphenyl)pyridine(PP)anditsprotonationstateswereoptimizedbymeansoftheB3LYP/6-31G(d)method.Foralltheselectedsystems,theexistenceofH-bondisinfavorofthestabilityofthesystems.Onthebasisoftheoptimizedgeometricalstructures,theirelectronicspectrumpropertieswerestudiedbytime-dependentdensityfunctionaltheory(TD-DFT)methosdviaahybridfunctionofB3LYPand6-31G(d)basisset.TheTD-DFTcalculationresultpredictstheabsorptionspectrumofPPat324nm(3.82eV),whichisinverygoodagreementwiththeexperimentalvalueof322nm(3.85eV)determinedinsolventchloroform.TheabsorptionspectraofthetwoprotonationstatesbothexertaredshiftinvariouspHmedia.

简介：ＡＮＯＶＥＬＲＥＤＵＣＴＩＶＥＴＥＴＲＡＡＬＬＹＬＡＴＩＯＮＯＦＰＹＲＩＤＩＮＥ￥ＸｉａｎＭｏｕＺＥＮＧ；ＪｉａＱｉａｎｇ；ＣＡＩａｎｄＹｉＪｉａｎＧＵ（ＤａｌｉａｎｉｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｃａｌＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃａ１...

简介：Aseriesofcopper(Ⅱ)complexeswithpyridineN-oxide-2-ylmethylidened-ithiocarbazatesasligandsweresynthesizedandcharacterizedbyIRspectra,electronicspectraandmagneticmomentsmeasurementatroomtemperature.Variabletemperaturemagneticsusceptibilites(3-300K)offourcomplexsweremeasuredandfittedwiththeBleaney-Bowersdimerequationbyconsideringthemagneticinteractionbetweenmolecules.Thefittingresultsshowtheexistenceofintramolecularferromagneticinteractionsandintermolecu-laranti-ferromagneticinteractionsinthesecopper(Ⅱ)complexes.

简介：Inthiswork,DSCandSEMstudiesindicatethation-ligandinteractioncanbeutilizedtoenhancetheinteractionofpoly(styrene-block-2-vinylpyridine)[P(S-b-2VP)]andpolyethylenebasedionomer(Surlyn).Thecompatibilityforthisblendingsystemcanbeimprovedbythisspecialinteractionand20/80wtistheoptimumblendingcompositionwithgoodcompatibility.FTIRresultsfurthercertifythatstronginteractionsexistintheblendingsystem.

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简介：Thecrystalandmolecularstructureofcopper(Ⅱ)dimericcomplexofS-methyl-B-N-(pyridineN-oxide-2-ylmethylidene)dithiocarbazatewithacetonitrile,[CuL(CH3CN)]2(ClO4)2,wasdeterminedbyX-raydiffraction.ThecomplexcrystalizesinmonoclinicsystemwithspacegroupP21/n,a=7.685(2),6=20.160(6),c=10.847(5)A,B=107.89(3),Z=2,Dc=1.788g/cm3,F(000)=835.8,u=18.17cm-1(Moka,R=0.057.EachCu(Ⅱ)ioninthecomplexissurroundedbyadistortedsquarepyramidal.ThebasalplaneiscomprisedofS,NandOatomsofoneligandtogetherwithaNatomofthesolvent--acetonitrile,whiletheaxialpositionisoccupiedbytheSatomoftheotherligand.ThebondlengthofCu-S(bridging)is3.038A.andCu-Cudistanceis3.700A.

简介：Aseriesofsulfonatedpolyimides(SPIs)containingpyridinegroupswerepreparedbydirectpolycondensationfrom1,4,5,8-naphthalenetetracarboxylicdianhydride(NTDA),4,4'-diaminodiphenylether-2,2'-disulfonicacid(ODADS)and4-(4-methoxy)phenyl-2,6-bis(4-aminophenyl)pyridine(DAM).Theresultingcopolymersdisplayedgoodsolubilityincommonorganicsolvents.Flexible,transparent,toughmembraneswereobtainedviasolutioncasting.Allthefilmsshowedhighthermalstabilitywithdesulfonationtemperatureover300℃.TheyexhibitedprominentmechanicalpropertieswithYoung'smodulusaround2.0GPa.Highprotonconductivity(0.23S/cmat100%RH)wasalsoobserved.Moreimportantly,thenewmaterialsexhibitedlowwateruptake(30wt%-75wt%at80℃)andimprovedwaterstability,whichwereattributedtotheacid-baseinteractionbetweensulfonicacidandpyridinefunctionalgroups.

简介：CuSpinealmicrospherescongregatedfrominterleavingnanoflakeswiththicknessof40to200nmweresynthesizedbyapyridine-solvothermalprocessviathereactionbetweencupricchloride(CuCl2·2H2O)andthioacetamide(TAA,CH3CSNH2).TheproductswerecharacterizedbyX-raydiffractionandscanningelectronmicroscopy.UV-Visabsorptionspectrum,excitationandphotoluminescencespectraofCuSpinealmicrosphereswereobtainedatroomtemperaturetoinvestigatetheiropticalproperties.ApossiblegrowthmechanismontheformationofCuSpinealmicrospheresisproposed.ThefactorsinfluencingtheevolutionofmorphologiesofCuScrystalsincludingthedosageofthereactants,surfactant,andsulphur-sourcewerealsoanalyzed.

简介：新奇的肼单体，pyridine-2，6二度((4-aminophenyl)thioureido)羰基(PATC)高效地被综合并且有各种各样的芳香的dianhydrides的polymerized。因而，(pyridinethiourea-imide)poly，有好热性质的s(PPTI)和火焰retardancy被制作。PATC和PPTI的结构被FTIR描绘，<啜class=“a-plus-plus”>1H-NMR，<啜class=“a-plus-plus”>13与元素的分析，crystallinity，organosolubility，固有的粘性和胶化浸透一起的C-NMR光谱学色析法的大小。包含C=S，CONH和元的PPTI在聚合物脊梁代替了pyridine一半显示出非结晶的自然并且在高度极的器官的溶剂并且甚至在象tetrahydrofuran(THF)那样的不太极的溶剂是容易地可溶的。聚合物在0.911.16dL/g的范围有固有的粘性，分子的重量在6800077000g/mol之间被发现。PPTI的电的性质以在频率的一个范围上经常的电介质被估计。他们的热稳定性被在范围发现的10%重量损失温度决定519563在组之中未改变。1/1-sGC子单元的蛋白质层次从中年的比较w相?盼?盼在RCC被减少吗？？

简介：Inthispaper,wehavestudiedtheadsorptionpropertiesofgoldbyα-alkylsubstitutedpyridineresin(BPR)inalkalinesolution.ThesingleanddualcomponentkineticmasstransferprocessofAu(I),Ag(I)andothermetalcyanideionswerealsoinvestigated.Theresultsobtainedshowthatthemasstransferratesofthecyanideionsintheresinphasearecloselyrelatedtothemolarratioandtheconfigurationofmetalcyanideions.TheelutionkineticsofAu(I)andothercyanideionsbyNH4SCNhasbeeninvestigatedsystematically.TheintraparticlediffusioncoefficientandactivationenergyofAu(I),Ag(I),Ni(I)Fe(Ⅲ）cyanideanionsweredeterminedinCI,NO3,OH-typeBPRresinatdifferenttemperatures.ItisfoundfromtheexperimentalresultsthatthemechanismforextractingAu(I),Ag(I)andothermetalcyanideanionsbyBPRresinbelongstoionexchangeprocess.Thedifferenceofactivationentropyofsomemetalcyanideanions(ΔS-ΔS^-)wasevaluated.

简介：在这个工作，综合体新热地稳定(amide-imide)poly，有在n丁基甲基imidazolium溴化物的悬挂的2-pyridyl-1,3,4-oxadiazole单位的s作为反应媒介被报导了。新二羟基的酸从肼的反应被导出，2-(5-(3,5-diaminophenyl)-1,3,4-oxadiazole-2-yl)pyridine(POBD)，和trimellitic酸酐。聚合物在丁基甲基imidazolium溴化物从diimide二酸(DIDA)和不同的芳香的肼的反应被准备，[bmim][Br]，面对triphenyl亚磷酸盐(TPP)作为没有需要任何额外的部件的压缩代理人。poly准备了(amide-imide)s被FTIR描绘，元素的分析，并且通过模型混合物的合成。准备聚合物是可溶的在极并且aprotic溶剂例如DMF，DMSO，NMP和DMAc。聚合物答案的固有的粘性在在0.125g/dL的集中在集中的H2SO4测量在的0.521.33dL/g的范围(25

简介：Thepolymerizationofethylenebytwoiron-basedcatalysts,{[2,6-ArN=C（Me）2C5H3N]FeCl2}（Ar=2,6-C6H3-Me21;2,6-C6Hv3（i-Pr）v2Ⅱ）hasbeeninvestigated.CatalystⅡproduceshighermolecularweightpolyethylene（PE）andbroadenedpolydispersitiesrelativetocatalystⅠunderanalogousconditionsandallpolymersarelinear.Thekineticprofileswithironcatalystsshowedasmoothpatternduringbothratebuild-upandratelowering,whicharedifferentfromthemetallocenecatalysts.ThepolymerizationactivityincreaseswithAl/Fevalueandanoptimumtemperaturerangeat40～45℃wasobserved.ThemolecularweightofPEdecreaseswiththeincreaseofAl/Feratioandriseofpolymerizationtemperature.

简介：Poly(4-vinylpyridine)supportednanoparticleofcopper(Ⅰ)iodideisreportedasagreenandrecyclablecatalystfortheregioselectivesynthesisof1,4-disubstituted-1H-1,2,3-triazolesfrombenzylhalides,sodiumazideandterminalalkynesinwater.Thiscatalystcanberecoveredbysimplefiltrationandrecycledupto8consecutiverunswithoutanylossofitsefficiency.

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简介：新奇的有点芳香的肼，N-(4-(4-(2,6-diphenylpyridine-4-yl)含苯氧基)苯基)-3,5-diaminobezamide(DPDAB)，与4-经由3,5-dinitrobenzoylchloride的芳香的亲核的替换被综合(4-(2,6-diphenylpyridine-4-yl)含苯氧基)苯胺(DPPA)，由催化钯的肼列在后面减小。这单体被用来commerically与几基于反应准备polyimides(PI)avaiabletetracarboxylicdianhydrides象pyromellaticdianhydride(PMDA)那样，benzophenonetetracarboxylicacidedianhydride(BTDA)和自行车[2.2.2]oct-7-ene-2，3,5,6-tetracarboxylicdianhydride(BCDA)。这些PI在0.340.76dL/g的范围有固有的粘性并且在各种各样的aprotic显示出好溶解度极的溶剂。PI的眼镜转变tempratures(Tgs)在184302的范围

简介：【摘要】：集体备课活动是现代教学中不可或缺的重要内容，说课是集体备课中的重要环节，通过有效措施提高教师说课水平，达到提升集体备课效果的目的，从而整体提高课堂教学质量。