排序方式: 共有27条查询结果,搜索用时 15 毫秒
1.
采用高温固相反应和化学气相传输法合成三硒化二铒。晶体属于四方晶系,M_r=571.40,空间群为P4/nmm,a=3.984(1),c=8.228(3),V=130.59(7),Z=1,D_c=7,27g/cm ̄3,F(000)=238,μ(MoKα)=528.86cm ̄(-1),对于187个I≥3σ(I)的独立衍射点,最后偏离因子R=0.066,R_w=0.078。化合物Er_2Se_3的晶体结构是由Er配位多面体的双层状结构通过共用Se(2)原子,沿c轴方向堆积而形成的三维结构。 相似文献
2.
0IntroductionThereisagreatcurrentinterestforthecrystalengineeringofcoordinationframeworks犤1,2犦,notonlybecauseoftheirpotentialapplicationsaszeolite-likematerialsinmolecularselection,ionexchange,andcatalysis,butalsobecauseoftheirintriguingvarietyofarchitecturesandnewtopologies.Uptonow,themostimportantdrivingforcesincrystalengineeringarecoordinationbondingandhydrogenbondinginteract-ion犤3~5犦.Theuniquedirectionality,strength,andcom-plementaryofnon-covalenthydrogenandcoordinatedbondingplayanimp… 相似文献
3.
4.
The novel complex {[Co(bipy)(azpy)2(NCS)2]·H2O}n (where bipy=4,4′-bipyridine, azpy=4,4′-azobisp- yridine) has been synthesized and characterized by elemental analyses, IR, UV, thermal analyses, and vari-able-temperature magnetic susceptibility. The crystal (C32H26CoN12OS2, Mr=717.70) belongs to the orthorhombic, space group Pnna, a=2.21312(16)nm, b=1.40403(10)nm, c=1.14237(8)nm, V=3.5497(4)nm3, Z=4, Dc=1.343g·cm-3, μ=0.645mm-1, F(000)=1476, and final R1=0.0691, wR2=0.1129 for 231 parameters and 1674 observed reflections [I >2.00σ(I)]. The Co(Ⅱ) atom is, in a distorted octahedral geometry, coordi-nated by six nitrogen atoms from two bridging bipy, two monodentate azpy, and two thiocyanate groups. The bridging ligand bipy links Co(Ⅱ) atoms to form the infinite “rod" with terminal coordination azpy ligand acting as sidearms. Unprecedented three parallel interpenetrating two-dimensional (4,4) networks and novel infinite triple helices are formed via hydrogen-bonding interactions. CCDC: 155588. 相似文献
5.
1 INTRODUCTION In the last decade, there has been great interest in the crystal engineering of supramolecular architectures organized by coordinate covalent bonds, hydrogen bonds and their combination owing to their fascinating structural diversity and potential applications as functional materials[1~3]. The self-assembly of coordinate polymers and supramolecules is highly influenced by factors such as ligands, metal ions, the counter ions, solvent, template, reaction temperature, pH va… 相似文献
6.
1 INTRODUCTION Synthesis of transition-metal complexes with Schiff-base has been a subject of considerable im- portance[1, 2]. These complexes are not only good coordination agents for Schiff-base, but also good bactericide and antitumour agent[3, 4]. A number of hydroxypyridinones are nontoxic compounds that have been applied in bioinorganic chemistry over many years[5], and their iron(III) complexes have been assessed for the amelioration of anaemia[6]. They have also been examined … 相似文献
7.
ZnCl2, PhONa和Et4NCl稨2O在乙腈溶剂中反应合成了一种二核锌配合物[Et4N]2[Zn2(OPh)2Cl4]。X射线衍射结果表明,晶体属单斜晶系,C2/m空间群,晶胞参数 a = 14.1366(2), b=13.6985(5), c=9.3308(3)牛?107.851(2)o, V=1719.92(9)?,C28H50O2N2Zn2Cl4,Mr=721.24,Z=2,Dx=1.393g/cm3,μ(MoKα)=1.732mm—1,F(000)=756, R=0.0552, wR=0.1534, S=1.027。 配合物是由2个阳离子Et4N+和1个阴离子[Zn2(OPh)2Cl4]2—组成。阴离子[Zn2(OPh)2Cl4]2—包含着1个中心Zn2O2菱形平面。配合物中的2个锌原子通过2个苯酚中的氧原子桥连,每个锌原子还与2个氯原子配位形成变形四面体结构。 相似文献
8.
标题化合物 C10H8ClN2O2S2Sb 由[C5H5NH][SbCl4]与 2-巯基氧化吡啶钠盐(Nampo)反应制得。其结构通过元素分析、IR 进行了表征,用 X-射线衍射法测定了该化合物的晶体结构。结果表明,晶体属于三斜晶系, 空间群为 P1, Mr = 409.50, 晶体参数:a = 9.4022(6), b =10.2910(7), c = 14.4631(9) ?, α= 104.321(1), β = 96.978(1), γ = 90.179(1)?, V = 1345.09(15)?3, Z = 4, Dc = 2.022 g/cm3, μ = 2.553 mm–1, F(000) = 792。晶体结构用直接法解出, 经全矩阵最小二乘法修正,最终结构偏离因子 R = 0.0368, wR = 0.0854。化合物分子中, 锑与一个氯原子和两个配体 mpo 配位,形成五配位变形的四角锥构型配合物。在晶胞堆积图中,锑原子又与另一分子中的氯原子以次级键形式作用,形成缺位配位多面体构型。 相似文献
9.
10.
通过(1)LnOCl/V_2O_5,(2)LnCl3/V及(3)LnOCl/LnCl/V_2O_5/V的高温固态化学反应,得到两种稀土钒酸盐:Ln_6V_3Cl_(10)O_(12)(Ln=La)及Ln_4V_5Si_4O_(22)(Ln=La~Nd)。La_6V_3O_(10)O_(12)晶体呈浅色透明片状,其结构可认为是由[La_3(VO_4)_3Cl]单元插入到LaCl3结构单元中而形成的,在结构中沿c轴方向存在一系列截面积为19.1的空洞。Ln_4V_5Si_4O_(22)(Ln=La,Ce,Pr,Nd)晶体呈,黑色针状,其结构可认为是由交替的稀土钒硅酸盐薄层及钒氧金红石层沿c轴堆叠而表现为准二维Chevkinite型结构。 相似文献