简介:Thetitlecomplex,[La(baec)1/2(H2btec)1/2(H2O)]n(H4btec=1,2,4,5-benzenetetracarboxylicacid)(1)wassynthesizedbythehydrothermalreactionof1,2,4,5-benzenetetracarboxylicdianhydridewithLa(NO3)3·6H2OinH2O,andcrystallizesinthetriclinicsystem,spacegroupP-1withα=0.64403(3)nm,b=0.94500(4)nm,c=0.96380(5)nm,α=88.535(2)°,β=100.314(2)°,γ=76.6470(10)°,V=1.69968(10)nm^3,Z=2,andfinalR=0.0274,Rw=0.0735.In1,eachLa(Ⅲ)ioniscoordinatedbyeightoxygenatomsfromsixcarboxylategroupsandonecoordinatedwatermolecule.TwodifferentcoordinstionmodesofH4btecwerePresentinthestructure,oneofwhichcontainstwoprotonatedcarboxylategrougpstobalancethecharge.
简介:Ta2O5电影被常规电子横梁蒸发方法在熔化硅石底层上扔。由在不同温度退火,非结晶、六角形、斜方晶的阶段的Ta2O5电影被获得并且由X光证实衍射计(XRD)结果。X光检查光电子光谱学(XPS)分析证明所有这些电影的化学作文是stoichiometry。非结晶的Ta2O5电影完成最高的激光,这被发现在355或1064nm的导致的损坏阀值(LIDT)任何一个,由六角形的阶段和最后斜方晶的阶段列在后面。当前者显示出一个一致熔化区域,当后者在至少一个缺点点上被集中时,在355和1064nm的损坏形态学是不同的,它被不同损坏机制导致。在1064nm的LIDT的减少被归因于增加结构的缺点,当时在355nm由于增加的联合效果结构的缺点和减少的乐队差距精力。[从作者抽象]
简介:合成了通式为K10H5[Ln(PMo7W2VO39)2].nH2O(Ln-La^3+,Ce^3+,Pr^3+,Nd^3+,Sm^3+,Eu^3+,Gd^3+,Dy^3+,Yb^3)的9种五元新型杂多配合物,并用元素化学分析,TG,ICP,IR,UV,31^1P,51V-NMR,ESR,XPS,XRD进行了表征,结果表明新配合物仍保持Keggin结构,稀土元素处于配合物的内界。借助TG-DTA,不同温度下的IR,XRD的水溶性实验考察了新配合物的热解性质,得出了热稳定的温度范围为400℃-500℃,为催化研究提供了依据。
简介:Yb3+complexeswithtwonitrilotriaceticacidmoleculeswerepreparedandtheircompositionsweredeterminedasK3[Yb(nta)2(H2O)]*5H2OandNa3[Yb(nta)2]*6H2Obyelementalanalyses.Theirstructureswerecharacterizedbysingle-crystalX-raydiffractionanalyses.IncomplexK3[Yb(nta)2(H2O)]*5H2O,theYbN2O7partformsanine-coordinatemonocappedsquareantiprismaticstructure.IncomplexNa3[Yb(nta)2]*6H2O,theYbN2O6partformsaneight-coordinatesquareantiprismaticstructure.Itcanbeseenthattheoutercations(K+andNa+)greatlyaffectthecoordinationnumberandcoordinatestructurefromtheseresults.
简介:Removalofcarbonylsulfide(COS)fromCO2streamissignificantfortheproductionandutilizationoffoodgradeCO2.ThisstudyinvestigatestheadsorptionperformanceofAg/NaZSM-5asadsorbentpreparedbyincipientwetnessimpregnationfortheremovalofCOSfromaCO2streaminafixed-bedadsorptionapparatus.Effectsofvariousconditionsonthepreparationofadsorbent,adsorptionanddesorptionwereintensivelyexamined.TheresultsrevealedthatCOScanberemovedtobelow1×10-9fromaCO2stream(1000ppmCOS/CO2)usingAg/NaZSM-5(10wt%AgNO3)withanadsorptioncapacityof12.86mg·g-1.Theadsorbentcanbefullyregeneratedusinghotairat450C.Theadsorptionabilityremainedstableevenaftereightcyclesofregeneration.
简介:Theorientationoftheadditionof5-amino-3-benzylthio-1,2,4-triazoleanditsanalogues(pyrazole)(1)withthearylisocyanatecanbedirectedbycontrollingthereactiontemperatureandoneoftheproduct,5-amino-1-arylaminocarbonyl-3-benzylthio-1,2,4-triazole(pyrazole)(2),canrearrangeat170Ctoanotherproduct,5-arylureylene-3-benzylthio-1,2,4-triazole(pyrazole)(3).Aplausiblemechanismexplanationforthisrearrangementreactionwaspresented.Itwassuggestedthattherearrangementreactioncouldbereferredtothethermodynamicstranspositionleadingtothepredominant5-arylureylene-3-benzylthio-1,2,4-triazoleenergypreferentially.
简介:Novelsulfur-containingcompounds(3a–3c,4a–4c)wereobtainedinethanolwith1,3-diphenyl-2-propanoneasthestartingmaterial.Theadvantagesofthisprocedureweremildreactionconditions,simpleprotocol,andhighyields.ThestructuresoftheproductswerecharacterizedbyIR,1HNMR,MSandelementaryanalysis.Thecrystalofthenewcompound4abelongstomonoclinic,spacegroupC2witha=18.727(3),b=6.5179(9),c=13.7576(18),b=131.0610(10)°,V=1266.2(3)A3,Z=2,Dc=2.136g/cm3,μ=1.078mm-1,F(000)=843,R=0.0490andwR=0.1247for3211observedreflectionwithI>2δ(I).X-rayanalysisrevealsthatthemoleculeisnotsymmetrical,themolecularstructureisstabilizedbyweakp–pstackinginteractions,andnoclassicalhydrogenbondscanbeobserved.
简介:水晶的Au5Si2/Si异质接面nanowires(Au5Si2/SiNWs)被热蒸发的SiO粉末在一个低真空系统在厚黄金涂的硅底层上获得。生产Au5Si2/Si异质接面的结构分析被采用一台传播电子显微镜(TEM)和一个选择区域执行电的衍射计。化学作文被纳入TEM的一个精力散的X光分光镜学习。一个二拍子的圆舞生长模型被建议描述Au5Si2/SiNWs的形成。在第一步期间,水晶的SiNWs经由在相对高的温度把帮助氧化物的生长过程与vapour-liquid-solid模型相结合的生长机制被形成。在第二步,preformedSiNWs的温度减少和减少片断与残余Au反应由一个solid-liquid-solid过程形成单个水晶的Au5Si2nanowires。现在的工作应该基于nanowires为未来合成和高质量的金silicidenanowires和微电子设备的研究是有用的。