简介:Thenovelcomplex[K(18-C-6)]2[Cd(mnt)2][18-C-6-18-crown-6,nmt=1,2-dicyanoethene-1,2-dithiolate,C2S2-(CN)2^2-]wassynthesizedandcharacterizedbyelementalanalysis,IRspectrumandX-raydiffractionanalysis.Thecomplexdisplaystwo-dimensionalnetworkstructureof[K(18-C-6)]complexsegmentsand[Cd(nmt)2]complexsegmentbridgedbyS-K-S,S-K-NandN-K-Ninteractionsbetweenadjacent[K(18-C-6)]and[Cd(mnt)2]units.
简介:AsimpleandefficientcascadeMichael/cyclizationreactionof3-aminoindolin-2-oneswithenones/enalswasidentifiedforthesynthesisofpotentiallybiologicallyactive3’,4’-dihydrospiro[pyrrol-3,2’-oxindoles],usingDBUasanefficientcatalystandethyleneglycolasanenvironmentallybenignsolvent.Morediverse3’,4’-dihydrospiro[pyrrol-3,2’-oxindoles]analoglibrarieswerepreparedingoodyields(upto97%).Thestructureof3’,4’-dihydrospiro[pyrrol-3,2’-oxindoles]wasconfirmedbymassspectrometryanalysis,NMRanalysisandsinglecrystalX-raydiffraction.Themainadvantagesofthismethodincludetheavailabilityofstartingmaterials,simpleexperimentaloperation,shortreactiontime,aswellashighyieldsobserved.
简介:SYNTHESIS AND 183W NMR CHARACTERIZATION OF P4W30Al4(H2O)2O11220- HETEROPOLYANIONSYNTHESISAND183WNMRCHARACTERIZ?..
简介:(R)-N-乙酰四氢噻唑-2-硫酮-4-羧酸在三乙胺存在下同乙酰氯反应得到光学活性产物(R)-N-乙酰四氢噻唑-2-硫酮-4-羧酸.用半经验的量子化学方法研究反应物及产物的电子结构和反应热焓.
简介:利用线性伏安法和恒电流电解法研究了苯酚在Ti/PbO2电极上的电催化氧化反应,通过电氧化过程中反应物和中间物的高效液相色谱测定,研究了苯酚在Ti/PbO2电极上电催化氧化的反应机理.实验发现,Ti/PbO2电极对水溶液中苯酚的电氧化具有显著的催化作用,25℃时,对初始浓度为2mmol/L的苯酚水溶液,恒定电流密度为50mA/cm2,电解3h,苯酚转化率为98.02%,有机碳去除率为54.36%.苯酚在Ti/PbO2电极上电催化氧化要经过对苯二酚或邻苯二酚、对苯醌、反丁烯二酸和草酸,最终变成二氧化碳和水的历程.第一步反应苯酚转化的主产物是对苯二酚.对苯二酚转化为苯醌和苯醌转化为反丁烯二酸的反应为慢反应,反丁烯二酸转化为草酸的反应为快反应.
简介:Anefficientandenvironmentallyfriendlyprocedurefortheone-potsynthesisoftetrahydropyrimidinonesfromaldehydes,β-diketonesandurea/thioureabyusingmagnesiumbromideasaninexpensiveandeasilyavailablecatalystundersolvent-freeconditionswasdescribed.ComparedwiththeclassicalBiginellireactionconditions,thisnewmethodhastheadvantageofgoodtoexcellentyields(74%-94%)andshortreactiontime(45-90min).ThestructureoftheBiginellireactionproductfromβ-diketone,salicylaldehydeandureahasbeenproposedtopossessanoxygen-bridgebycyclization(intramolecularMichael-addition).
简介:利用水热技术合成了一个以Keggin型多金属氧酸盐和柔性有机配体为建筑块的三维超分子化合物[H2bbi]3[α-PMo12O40]2(1)(bbi=1,4-双-(咪唑-1-基)丁烷),用X-射线单晶衍射、元素分析、红外光谱和X-射线粉末衍射对晶体结构进行了表征.X-射线单晶衍射显示,该晶体属于三斜晶系,P-1空间群,a=1.18360(9)nm,b=1.20932(10)nm,c=1.77728(15)nm,α=74.0890(10)°,β=70.9490(10)°,γ=71.8160(10)°,V=2.2421(3)nm3,Z=2,Dc=3.109g/cm3,F(000)=2300,μ=3.39mm-1,S=1.047,R1=0.0350,wR2=0.0776[I〉2σ(I)].
简介:含有ONO给体原子的N-邻甲氧基苯甲酰基水杨酰肼配体与[VO(acac)2]在乙醇中反应得到钒(V)酰配合物VO[(C15H12N2O4)(OC2H5)].标题化合物晶体属三斜晶系,空间群Pī,晶胞参数:a=0.89411(5)nm,b=1.0063(2)nm,c=1.0392(2)nm,α=110.171(7)°,β=95.219(3)°,γ=93.822(2)°;V=0.8692(2)nm3,Z=2,R1=0.0513,wR=0.1532.研究结果表明:钒原子具有扭曲的四方锥配位构型,钒酰氧原子处在锥顶位置,配体的3个给体原子与溶剂分子形成锥底平面.
简介:金属有机配合物在磁性、荧光、分子吸附和半导体等多功能材料方面有着潜在的应用价值.通过水热方法合成了一种新型零维铈(Ⅳ)配合物ECe(dipic)。]·2(Hpa)·2H2O(2,6一Hzdipic=2,6一吡啶二羧酸,pa=对氨基吡啶),并通过X-射线衍射、元素分析、红外光谱和热重对该化合物进行了表征.该化合物属于单斜晶系,P2,/f空间群,a=1.09437(10)nm,6—2.05263(18)nm,c=1.58776(14)nm,β=106.0850(10)°,Z=4,V=3.427(1)nm2,Dc=1.670g/cm。,Mf一861.72,A(MoKa)=0.071073nm,μ=1.41mm-1,F(000)=1728,R=0.0396,wR一0.1073,符合,〉2d(I)的独立衍射点4997个.铈(1V)离子被3个完全去质子化的羧基围绕,整个分子实体显负电,平衡电荷由质子化的对氨基吡啶提供.在该配合物中,N—H…O和o~H…O氢键对增强配合物的稳定性起了重要作用.
简介:Theadsorptioncapabilityofloamsoilfornano-TiO2affectedbytheamountandintensityofleachedwaterhasbeeninvestigatedbysimulatingthenaturalrainfallprocessundertheleachingcondition.Theresultsshowthattheamountandtheintensityofleachedwateraretwoimportantfactorsaffectingtheadsorptioncapabilityofloamsoilfornano-TiO2.Theresultsindicatethatthedepthoftheloamsoilcontainingamaximalamountofnano-TiO2isproportionaltotheamountofleachedwater,whileitisinverselyproportionaltotheintensityofleachedwater,ataconstantamountoftheleachedwater.Itwasalsofoundthattheadsorptioncapabilityofsoilsfornano-TiO2canbeimprovedbyaddingothermaterials,suchasdissolvedorganicmatter(DOM),bentoniteandstraw.ItwasfoundthatDOMisthebestsorbentforimprovingtheadsorptioncapabilityofloamsoilfornano-TiO2,followedbybentonite,whilestrawisnotsuitableforthemodificationofloamsoil.Theimprovementofadsorptioncapabilityofloamsoildependsontheamountoftheseadditives.Nano-TiO2canbeeffectivelyadsorbedonthesurfacelayerofloamsoilcontaininganappropriateamountofadditive.
简介:忍受2,6二度(imino)的一系列钴建筑群含苯氧基的ligands,LCoCl2[L=2,6-(ArNCH)2CH3C6H2OH]被ligand2,6二度(imino)的反应综合有钴二氯化物的相等的鼹鼠的酚,和这些建筑群被元素的分析描绘,1HNMR,MS和红外系列。一建筑群的结构被单个水晶X光检查衍射分析决定。
简介:InT12SO4+Na2SO4+di(2-ethylhexyl)dithiophosphoricacid+n-CsH18+watersystem,theT1^+equilibriummolalitiesweremeasuredationicstrengthfrom0.1to2.0mol·kg^-1containingNa2SO4assupportingelectrolyteinaqueousphaseandatconstantmolalityofextractantattemperaturesfrom278.15to303.15Kinorganicphase.ThestandardextractionconstantsK^0atvarioustemperatureswereobtainedbymethodsofextrapolationandpolynomialapproximation.Thermodynamicquantitiesfortheextractionprocesswerecalculated.