简介:ItisprovedthatalinearlyrecursivesequenceofnindiceaoverfieldF(n≥1)isautorntaticallyaproductofnlioearlyrecurplvesequenceaof1-lndexoverFbythetheoryofHopfalgebras.Bytheway,thecorrespondencebetweenthesetoflinearlyrecursivesequenoesof1-indexandF[X]^0isgeneralisedtothecaseofn-index.
简介:我们学习公制的n躺着代数学G\mathcal的结构{G}在复杂领域上。让G=S?R\mathcal{G}=\mathcal{S}\oplus\mathcal{R}是Levi分解,在此R\mathcal{R}是G\mathcal的激进分子{G}并且S\mathcal{S}是G\mathcal的强壮的semisimplesubalgebra{G}。由m(G)表示m\left(\mathcal{G}\right)不能分解的公制的n躺着代数学和R^\mathcal的所有最小的理想的数字{R}^\botR的直角的补充。我们获得下列结果。作为S\mathcal{S}-modules,R^\mathcal{R}^\bot对双模块同形${\mathcal{G}\mathord{\left/{\vphantom{\mathcal{G}\mathcal{R}}}\right。\kern-\nulldelimiterspace}\mathcal{R}}${\mathcal{G}\mathord{\left/{\vphantom{\mathcal{G}\mathcal{R}}}\right。\kern-\nulldelimiterspace}\mathcal{R}}。向量空间的尺寸在G\mathcal上由所有nondegenerate跨越了不变的对称的双线性的形式{G}等于G\mathcal上的某些线性转变的向量空间的{G};这种尺寸比大或等于+1m\left到m(G)(\mathcal{G}\right)+1。R\mathcal的centralizer{R}在G\mathcal{G}等于所有最小的理想的和;它是R^\mathcal的直接的和{R}^\bot和G\mathcal的中心{G}。最后,G\mathcal{G}没有强壮的semisimple理想如果并且仅当R^椠?楤晳癡?
简介:以乙酰丙酮和1R,2R-环己二胺进行缩合得到N,N'-双(乙酰丙酮)-1R,2R-环己二胺的Schiff碱配体L’,以乙酰丙酮和1S,2S-环己二胺进行缩合得到N,N'双(乙酰丙酮)-1S,2S-环己二胺的Schiff碱配体L^2,然后将L^1和L^2与AgClO4,AgBF4,AgSbF6进行配位反应,得到了3个配合物Ag2(L^1)(L^2)ClO4)2n(1),Ag2(L^1)(L^2)(BF4)2n(2)和Ag2(L^1)(L^2)(SbF6)2n(3),并用元素分析,FT—IR和X-射线单晶衍射进行了表征。结果表明,配合物1-3都属于单斜晶系,空间群P21/n,配合物1的中心Ag(I)离子采用扭曲四面体的配位构型,配合物2和3的中心Ag(I)离子都是近似平面三角形的配位构型。配合物1—3都通过配位作用向空间扩展形成2D网状结构。
简介:N-acetyl-D-methionine,NaAcandtheremainsofN-acetyl-L-methioninedramaticallyaffectthepurificationofL-methioninewhenpurifiedfromthemixtureofenzymaticallydeacylatedN-acetyl-DL-methionine,leadingtoalowyieldconventionally.Here,thispaperreportsasuccessfulseparationandpurificationofbothL-methionineandN-acetyl-D-methioninebyanHion-exchangecolumn.ThepH,L-Metconcentrationandtheratiobetweenthecontentofsodiumcationandtheion-exchangecapacitywereoptimizedtoobtainthemaximumyield.Experimentalresultsindicatethat,undertheoptimizedconditions,theyieldsofL-methionineandN-acetyl-D-methioninecanreachashighas85%and75%,respectively.
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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:合成了N,N′-亚水杨基皮考林酰肼(HL)及其铁配合物[FeL2](C26H20FeN6O4,Mr=536.33).X射线衍射实验结果表明,标题配合物晶体属于正交晶系,空间群为Pbcn,晶体学参数:a=1.4970(1)nm,b=1.51556(9)nm,c=2.0920(2)nm,V=4.7462(6)nm3,Z=8,Dc=1.501Mg·m-3,F(000)=2208,μ(MoKα)=0.682mm-1,R=0.0695,Rw=0.1502.在配合物[FeL2]中,铁(Ⅱ)原子具有扭曲的八面体配位构型,晶体通过分子间氢键作用形成缔合分子对.红外光谱表明,配体在形成配合物后,ν(CO)和ν(CN)红移.电子光谱表明存在π-π*和d-π*的跃迁;荧光光谱表明,配合物金属对配体n-π*激发引起的荧光发射峰有较大的影响.