二-μ-羟基二联吡啶铜(Ⅱ)二高氯酸根的晶体结构及弱相互作用

制备了羟基桥连的双核铜化合物[Cu2(bipy)2(OH)2](ClO4)2 (bipy= 2,2'-bipyridine) ,用X-射线方法测定了它的晶体结构.晶体属三斜晶系,空间群C2/m,α= 13.569(3), b= 15.212(3), c = 6.2715(10)A,β= 113.620(10), V = 1 188.4(4) A3, Dc = 1.879 g/m3, Z = 2,分子式 C20H18Cl2Cu2N4O10,分子量Mr = 672.36, F(000) = 676.0.化合物的结构由1个[Cu(bipy)2(OH)2]2+阳离子和2个弱配位的高氯酸根组成,每个阳离子内的2个Cu(II)通过2个羟基桥连接,Cu(II)原子表现出CuO2N2 四方平面构型.分子内存在高氯酸根的Cu(1)…O(3) 弱配位键,分子间存在O(1)-H(1)A…O(2)和C(1)-H(1)B…O(2)2种类型的氢键.     

[Cu(C_7H_5O_2)_2]·(C_4H_5N_2)的合成与晶体结构

报道了标题化合物的合成及晶体结构 .经 X射线单晶结构分析结果表明 ,该配合物 [Cu(C7H5O2 ) 2 ]·(C4 H5N3)属三斜晶系 ,空间群为 Pī,晶胞参数 a=0 .72 73(11) nm ,b=0 .9182 (14 ) nm,c=1.384 (2 ) nm,α=10 8.96 (2 )°,γ=94 .0 6 (2 )°,γ=96 .80 (2 )°,U=0 .86 2 (2 ) nm3,Z=2 ,F(0 0 0 ) =4 10 ,Dc=1.5 4 4 mg/ m3.最终偏差因子 R[I≥ 2 σ(I) ]a:R1 =0 .0 787,w R2 =0 .16 5 9     

三维超分子化合物[Cu2(phen)2(H2O)4]·(SO4)2的水热合成、晶体结构及荧光性质研究

在水热条件下,用Cu(Ⅱ)盐与邻菲罗啉(phen)进行反应,得到了三维超分子[Cu2(phen)2(H2O)4]·(SO4)2(化合物1).化合物1为单斜晶系,C2/c空间群,晶胞参数:a=4.233(2)nm,b=1.3844(8)nm,c=0.7025(4)nm,β=90.230(7)°,V=4.117(4)nm3...     

水杨醛甘氨酸还原型希夫碱铜配合物的合成与结构表征

通过缩合和还原反应合成了还原型希夫碱配体H_2Sal Gly.以H_2Sal Gly、2,2'-联吡啶和醋酸铜为原料合成了配合物[Cu(Sal Gly)(2,2'-bipy)]·3H_2O,并通过溶液挥发法得到了配合物的单晶.利用元素分析、IR及单晶X-衍射仪对所合成配合物的结构进行了表征.结果表明,晶体属单斜晶系,空间群为Cc,Z=4,a=0.528 35(8)nm,b=2.253 9(3)nm,c=1.662 5(3)nm,α=90°,β=98.029(2)°.     

两种Cu(II)配合物的合成和结构表征(英文)

选取1,9—二(2—氟代苯基)—2,5,8—三氮杂壬烷与铜(Ⅱ)的苯甲酸盐和硝酸盐,合成了两个新的配合物[Cu(C18H23F2N3)(C7H5O2)(H2O)](C7H5O2)·2(H2O)(1)和[Cu(C18H23F2N3)(NO3)2]·(H2O)1/2(2),并获得其单晶,测定了晶体结构.单晶衍射数据显示化合物(1)属三斜晶系Pi空间群,化合物(2)属单斜晶系Cc空间群     

以[Nb24O72]24-为构筑块的多铌氧酸盐的合成、结构及性质研究

利用常规水溶液法合成了多铌氧酸盐:[Cu(en)2(H2O)]3[Cu(en)2]0.5[Cu(en)2(H2O)2]0.25{[Cu(en)2][Nb24O72H14.5]}.6.75H2O(en=ethylenediamine)(1),并借助元素分析、IR、UV、XPS、顺磁(EPR)、场诱导表面光电压谱(EFISPS)、热重(TG)和X-射线单晶衍射分析对化合物进行了结构表征和性质研究.结果表明:化合物属三斜晶系,Pi空间群,晶胞参数为:a=1.665 41(5)nm,b=2.228 06(7)nm,c=2.513 80(8)nm,α=89.340 0(10)°,β=73.707 0(10)°,γ=81.972 0(10)°,V=8.861 7(5)nm3,Z=2,R1=0.072 4,wR2=0.197 9.化合物分子包含1个{[Cu(en)2][Nb24O72H14.5]}7.5–阴离子,3个[Cu(en)2(H2O)]2+、0.5个[Cu(en)2]2+和0.25个[Cu(en)2(H2O)2]2+配离子和6.75个结晶水分子.XPS、EPR及价键计算都表明化合物1中所有Cu为+2价,表面光电压谱(SPS)及场诱导表面光电压谱(EFISPS)测试表明化合物1有n-型半导体的特征.     

具有Dawson结构的过渡金属杂多钨磷酸盐的氧化还原性质研究

采用极谱和循环伏安法,研究过渡金属杂多钨磷酸盐K_x[P_2W_(17)ZO_(62)]·nH_2O(Z=Ti~(4+),Mn~(2+),Fe~(3+),Co~(2+),Ni~(2+),Cu~(2+),简写为P_2W_(17)Z)在溶液中的氧化还原性质,发现杂多阴离子的第一极谱半波还原电位E_(1/2)的顺序为Cu~(2+)>Ni~(2+)>Co~(2+)>Fe~(2+)>Mn~(2+)。分析了循环伏安峰电位与pH的关系,提出了它们的还原机理,讨论了过渡元素对杂多阴离子氧化还原性质的影响。     

一维配位聚合物[Ni{S_2P(OCH_2CH_2Ph)_2}_2(4,4'-bipy)]_n的合成与晶体结构

在丙酮溶剂中,双((O,O’-二苯乙基)二硫代磷酸)合镍配合物与双齿桥联氮碱配体4,4’-联吡啶(4,4’-bipy)反应,得到了一维配位聚合物[Ni{S2P(OCH2CH2Ph)2}2(4,4’-bipy)]n,用元素分析、红外光谱、1H NMR、13C NMR、31P NMR和X-射线衍射技术对其结构进行了表征。该化合物属单斜晶系,C 2/c空间群,晶胞参数为a=29.500(4),b=11.289(3),c=13.407(4),β=99.44(4)°,V=4404.4(18)3,Z=4,C42H44N2NiO4P2S4,Mr=889.68,Dc=1.342 g/cm3,F(000)=1856,μ(MoKα)=0.744 mm-1。可观测衍射点为2550个,R=0.052,wR=0.1329(I>2σ(I)),所有数据的R=0.0971,wR=0.1489。     

Multiphoton ionization of pyrrole-water mixed clusters

Multiphoton ionization of the hydrogen-bonded pyrrole-water clusters ( C4H5 N)n H2O)m is studied with a reflectron?time of flight mass spectrometer at 355 nm. With increasing partial concentration of pyrrole in a gas mixture source, a series of poly-pyrrole-water binary-mixed cluster ions can be observed, including unprotonated cluster ions [(C4H5N)x (H2O)y]* , protonated cluster ions [(C4H5N)x (H2O)yH]* and dehydrogenated cluster ions [ ( C4 H4 N) ( C4 H5 N) x ( H2O) y ] + . Ab initio calculations of their structures, bond strengths, charge distributions and re action energies are carried out. Stable structures of these clusters are obtained from the calculations. A probable forma tion mechanism of the cluster ions [(C4H5N)x(H2O)y] + , [(C4H5N)x (H2O)y]H+ and [(C4H4N) (C4H5N)x (H2O)y]-is supposed to be the ionization of clusters followed by dissociation.     

混配配合物[Cu(1,10-phen)(CH2(COO)2)(H2O)]2·3H2O的合成和晶体结构

在碱式碳酸铜与丙二酸水溶液反应后的滤液中加入1,10-(口菲)啰啉的乙醇溶液,放置获得一种蓝色块状的晶体.X-ray衍射显示为三斜P-1群,α=11.560(2),b=11.750(2),c=12.510(3)A,α=92.13(3)°,β=105.50(3)°,γ=109.30(3)°,v=1530.6(5)A3,z=2,Mr=781.66,F(000)=800,Dc=1.696g/cm3,μ(M0Kα)=1.467mm-1,R=0.0392.二聚体[Cu(1,10-phen)(CH2(COO)2)(H2O)]2是通过分子间的氢键形成的.     

Dawson结构多金属含氧酸盐热解性质研究

用变温XRD,变温IR以及TG-DTA等方法,系统地研究了具有Dawson结构的Ym Hn P2 M12 O62·qH2O(Y=K+,NH4+,Cu2+;M=Mo,W)的热解性质,获得了它们较为精确的热分解温度,对其热分解的判断方法提出了一些新的见解.结果表明,以钼为配位原子的Dawson结构钾盐,铵盐,铜盐分别在250℃,210℃,240℃发生了热重排,生成了具有Keggin结构的化合物.以钨为配位原子的钾盐在410℃也有相似的行为,但铵盐和铜盐却没有观察到类似的热重排现象,分别在400℃,450℃直接热分解为WO3.这些结果显示,热重排现象的发生可能与相应的Keggin结构化合物的热稳定性有关.     

Structural snapshots along the reaction pathway of ferredoxin-thioredoxin reductase

Oxygen-evolving photosynthetic organisms regulate carbon metabolism through a light-dependent redox signalling pathway. Electrons are shuttled from photosystem I by means of ferredoxin (Fdx) to ferredoxin-thioredoxin reductase (FTR), which catalyses the two-electron-reduction of chloroplast thioredoxins (Trxs). These modify target enzyme activities by reduction, regulating carbon flow. FTR is unique in its use of a [4Fe-4S] cluster and a proximal disulphide bridge in the conversion of a light signal into a thiol signal. We determined the structures of FTR in both its one- and its two-electron-reduced intermediate states and of four complexes in the pathway, including the ternary Fdx-FTR-Trx complex. Here we show that, in the first complex (Fdx-FTR) of the pathway, the Fdx [2Fe-2S] cluster is positioned suitably for electron transfer to the FTR [4Fe-4S] centre. After the transfer of one electron, an intermediate is formed in which one sulphur atom of the FTR active site is free to attack a disulphide bridge in Trx and the other sulphur atom forms a fifth ligand for an iron atom in the FTR [4Fe-4S] centre--a unique structure in biology. Fdx then delivers a second electron that cleaves the FTR-Trx heterodisulphide bond, which occurs in the Fdx-FTR-Trx complex. In this structure, the redox centres of the three proteins are aligned to maximize the efficiency of electron transfer from the Fdx [2Fe-2S] cluster to the active-site disulphide of Trxs. These results provide a structural framework for understanding the mechanism of disulphide reduction by an iron-sulphur enzyme and describe previously unknown interaction networks for both Fdx and Trx (refs 4-6).     

水热/溶剂热原位合成法制备有机膦酸铜化合物

在水热(溶剂热)条件下,以对苯二甲基二膦酸二乙酯(dixdp)为有机配体,分别以2,2'-联吡啶(bpy)及1,10-菲啰啉(phen)为辅助配体,合成了2个具有零维结构的有机膦酸铜化合物[Cu2(H2O)2(H2L)(bpy)2(H3L)2]·2H2O(1)及[Cu2(H2O)2(H2L)2(phen)2]·6H2O(2);其中dixdp在水热/溶剂热条件下发生原位水解反应生成对苯二甲基二膦酸(H4L)。化合物1属于单斜晶系,P 21/n空间群,该化合物的每个中心离子Cu采用[CuO3N2]四方锥体几何配位,两个相邻金属中心Cu通过H3L-配体相连接形成0D双核铜单元。化合物2属于三斜晶系,P-1空间群,该化合物每个金属中心Cu也采用[CuO3N2]四方锥体几何配位,但不同的是化合物2中的两个相邻Cu原子通过H2L2-配体相连接形成双金属环单元。     

新型离子型有机锡化合物{[Ph2Sn]2[2,6-Py(CO2)]3H2O}2-[HNEt3]+2的晶体结构研究

利用三苯基氯化锡和2,6-吡啶二甲酸在三乙胺存在下以1:1摩尔比反应,合成了离子型有机锡化合物[Ph_2Sn]_2[2,6-Py(CO_2)]_3H_2O~(2-)[HNEt_3]_2~+.通过元素分析、红外光谱和核磁共振氢谱对其结构进行了表征.用X-射线单晶衍射测定了该化合物的晶体结构.化合物的单斜晶系,空间群P2_1/n,α=1.707 3(7)nm,b=1.744 7(7)nm,c=2.433 3(10)nm,β=109.694(7)°,Z=4,V=6.824(5)nm~3,Dc=1.282 g/cm~3,μ=0.793 mm~(-1),F(000)=2 696,R_1=0.056 3,WR_2=0.1539.化合物中两个锡原子呈七配位畸变五角双锥构型.     

三元混合配合物[Cu2(C8H4F3O2S)2O(C3H3N2)]的合成和晶体结构

室温下利用金属铜粉和2-噻酚甲酰三氟丙酮、吡唑反应,合成了新的双核铜(II)[Cu2(C8H4F3O2S)2O(C3H3N2)].配合物通过元素分析、红外光谱、电导率进行表征.测定了该配合物的晶体结构.结果表明,晶体属单斜晶系,P2(1)/C空间群,晶胞参数:a=0.786 63(16)nm,b=1.792 0(4)nm,c=1.705 3(3)nm;V=2.359 3(8)nm3,Z=4,Dc=1.843 g.cm-3.结果表明,每个铜原子由3个氧原子和1个氮原子配位形成平面四方结构,2个铜原子由吡唑和氧桥联形成双核铜配合物.     

The crystal structure of an oxygen-tolerant hydrogenase uncovers a novel iron-sulphur centre

Hydrogenases are abundant enzymes that catalyse the reversible interconversion of H(2) into protons and electrons at high rates. Those hydrogenases maintaining their activity in the presence of O(2) are considered to be central to H(2)-based technologies, such as enzymatic fuel cells and for light-driven H(2) production. Despite comprehensive genetic, biochemical, electrochemical and spectroscopic investigations, the molecular background allowing a structural interpretation of how the catalytic centre is protected from irreversible inactivation by O(2) has remained unclear. Here we present the crystal structure of an O(2)-tolerant [NiFe]-hydrogenase from the aerobic H(2) oxidizer Ralstonia eutropha H16 at 1.5?? resolution. The heterodimeric enzyme consists of a large subunit harbouring the catalytic centre in the H(2)-reduced state and a small subunit containing an electron relay consisting of three different iron-sulphur clusters. The cluster proximal to the active site displays an unprecedented [4Fe-3S] structure and is coordinated by six cysteines. According to the current model, this cofactor operates as an electronic switch depending on the nature of the gas molecule approaching the active site. It serves as an electron acceptor in the course of H(2) oxidation and as an electron-delivering device upon O(2) attack at the active site. This dual function is supported by the capability of the novel iron-sulphur cluster to adopt three redox states at physiological redox potentials. The second structural feature is a network of extended water cavities that may act as a channel facilitating the removal of water produced at the [NiFe] active site. These discoveries will have an impact on the design of biological and chemical H(2)-converting catalysts that are capable of cycling H(2) in air.     

叠氮桥联一维链状聚合物[Cu_2(N_3)_4(en)_2]_n的合成及结构和磁性的研究

由CuCl2、NaN3和乙二胺在水溶液中反应,合成了分子聚合物[Cu2(N3)4(en)2]n(1)(en=乙二胺),并通过X射线单晶衍射确定了其晶体结构.晶体结构属于单斜晶系,C2/c空间群,其晶胞参数为a=17.672(5)A°,b=6.397(4)A°,c=26.221(7)A°,β=100.089(5)°,Z=16.在配合物1中,Cu(1)和Cu(2)离子分别采取四配位的平面几何构型和变形的八面体几何构型,每个Cu(1)之间通过单个叠氮以1,3位方式桥联形成一维链状结构.磁性研究表明,在配合物1中,Cu(II)与Cu(II)离子之间表现为反铁磁相互作用.用哈密顿函数H=-2JSCuSFe对其χMT-T曲线进行了拟合,得到配合物1的朗日因子g=2.11,交换常数J=-0.87cm-1.     

[(dien)2Cu2Cl2(H2O)]Cl2的合成和晶体结构

标题化合物分子式为C8H28Cl4Cu2N6O,属单斜晶系,空间群为 P21/m,a = 6.721(1) 牛琤 = 14.606(2) 牛琧 = 10.304(1) ,b = 95.26(1),体积为1007.3(2) ?,Z = 4,R1 = 0.0323,wR2(F2) = 0.0473,T = 296 K。     

[（n-Bu）4N]2[X2Mo4O10（OCH3）2]的合成与表征

本文选用醌类配体菲醌和酚类配体1，2-二羟基萘，合成了具有相似结构、通式为[(n-Bu)4N]2[X2Mo4O10(OCH3)2](X=OC10H6O和OC14H8O)的二种四聚钼多酸配合物，进行了元素分析、核磁共振、红外光谱和热重分析等表征．并对菲醌与钼多酸配合时由醌式状态向酚式结构的还原进行了研究和探讨．     

2维Strandberg-型钼磷酸盐合成与性质表征

2维Strandberg-型钼磷酸盐H2Cu2(en)4P2Mo5O23·3H2O通过磷酸氢二钠、钼酸铵、醋酸铜、乙二胺(en)水热反应得到,并对其进行元素分析、紫外、红外、X射线单晶衍射和热重分析等测试.单晶结构表征显示该晶体属于正交晶系,Ibca空间群:晶胞参数:a=11.344(7)10-10 m,b=15.022(10)10-10 m,c=38.52(2)10-10 m,β=90°,V=6 565(7)10-30 m3,Dc=2.681g·cm-3,Z=8,F(000)=5 136,R1=0.041 7,wR2=0.128 2.{P2Mo5O23}单元通过Mo-O-Cu化学键的连接和Cu(en)2H2O基团共享顶点氧原子连接成为1个2维平面.