Synthesis, Crystal Structure and Properties of the Binuclear Complex [Sm2(C10H9N2O4)2(C10H8N2O4)2(H2O)4]

Abstract  A novel binuclear Smarium (III) complex with N-(2-propionic acid)-salicyloyl hydrazone (C₁₀H₁₀N₂O₄, H₃L) was prepared and characterized. The crystal structure of [Sm₂(H₂L)₂(HL)₂(H₂O)₄] (1) was determined by X-ray single crystal diffractometry. 1 crystallizes in the monoclinic systerm, space group P2(1)/c, with a = 0.10229(2), c = 31.549(7), b = 0.70599(15) nm, and Z = 4. In the structure, Sm(III) is nine-coordinated by carboxyl O and acyl O atoms and imido N atoms of two ligands (H₂L and HL forms) and O atoms from two water molecules. H₂L and HL act as tridentate ligands which form two stable five-numbered chelating rings sharing one edge in the keto form for each ligand, and the carboxyl groups of two ligands were coordinated via bidentated bridging form. The coordination polyhedron around Sm (III) was described as a monocapped square antiprism. The inter- and intramolecular hydrogen bonds resulted in a three-dimensional network and provided extra stability for the structure. The complex was researched the interaction with calf thymus DNA by electronic absorption titration and emission titration. The results show that the complex is bound to calf thymus DNA mainly by intercalation .The complex also shows good fluorescence property. Index Abstract  The title compound, [Sm₂(H₂L)₂(HL)₂(H₂O)₄] was synthesized by the treatment of N-(2-propionic acid)-salicyloyl hydrazone (C₁₀H₁₀N₂O₄, H₃L) and Sm(NO₃) · 4H₂O and its crystal structure determined. Single crystal X-ray diffraction analysis reveals that Sm (III) is nine-coordinated by carboxyl O and acyl O atoms and imido N atoms of two ligands (H₂L and HL forms) and O atoms from two water molecules. The carboxyl groups of two ligands were coordinated via bidentated bridging form. The coordination polyhedron around Sm (III) was described as a monocapped square antiprism. The inter- and intramolecular hydrogen bonds resulted in a three-dimensional network and provided extra stability for the structure.      

Crystal structure of a novel two-dimensional supramolecular network based on polyoxoanion and yttrium<Superscript>III</Superscript> coordination cation

A novel compound (NH⁴)₂Y(H₂O)₈[PMo₁₀V₂O₄₀]·10H₂O has been prepared in an aqueous solution and characterized by elemental analysis, IR, and TG-DTG analysis. X-ray diffraction analysis was carried out on (NH₄)₂Y(H₂O)₈ [PMo₁₀V₂O₄0]·10H₂O single crystal, which crystallizes in the monoclinic system of a space group P21/c witha=0. 9871 (3) nm,b=1. 5424 (5) nm,c=2.7924(9) nm, β = 94.183(5)° and Z=2. In the compound, a two-dimensional network is constructed by the PMo₁₀V₂O ₄₀ ^5? anion and the Y(H₂O) ₈ ³⁺ cation building blocks via hydrogen bonding exhibiting the porous structure.     

一维链状超分子化合物[Cu(dafo)_2(H_2O)_2](OPA)_2的合成和晶体结构

用4,5-二氮芴-9-酮(dafo)、邻苯二甲酸和硝酸铜合成了二价铜的一维链状超 分子化合物[Cu(dafo)_2(H_2O)_2]-(OPA)_2(OPA=邻苯二甲酸一价阴离子),其结构 通过单晶X射线衍射法确定。该化合物是单斜晶系,空间群为P2(1)/c。晶胞参数： a = 0.71093(16)nm, b = 1.5724(4)nm, c = 1.5357(3)nm, α=90.000(5) °, β =102.220(4) °,γ=90.000(5) °, V = 1.6778(6)nm~3, Z = 2, F(000) = 814, M_r = 794.17, D_c = 1.527 g/cm~3, μ = 0.727 mm~(-1), R_1 = 0.0406, wR_2 = 0.0930.单晶结构分析表明该化合物具有一维链状结构,该结构是通过氢 键这种弱相互作用形成的。     

基于神经网络的股票收益率预测研究

在金融领域的资产定价模型修正过程中,股市的非线性现象往往被选择性忽视,未纳入模型框架,现有模型亦无法刻画因子之间的非线性定价结构。为解决上述问题,引入了机器学习领域中的神经网络模型,以捕获市场组合收益率、市值、账面市值比三因子间的非线性定价结构,并对股票收益率进行预测。将该模型与经典Fama-French三因子模型在样本外拟合优度、多空策略业绩表现上做了对比,结果表明：神经网络模型能精准捕获市场组合收益率、市值、账面市值比3个因子之间的非线性关系,且在样本外拟合优度、多空策略业绩表现上均要优于传统三因子线性定价模型。     

Crystal structure of a novel two-dimensional supramolecular network based on polyoxoanion and yttriumIII coordination cation

A novel compound (NH4)2Y(H2O)8[PMo10V2O40]·10H2O has been prepared in an aqueous solution and characterized by elemental analysis, IR, and TG-DTG analysis. X-ray diffraction analysis was carried out on (NH4)2Y(H2O)8 [PMo10V2O40]·10H2O single crystal, which crystallizes in the monoclinic system of a space group P21/c with a=0.9871(3) nm,b=1.5424(5) nm, c=2.7924(9) nm, β= 94.183(5)° and Z=2. In the compound, a two-dimensional network is constructed by the PMo10V2O54-0 anion and the Y(H2O)83+ cation building blocks via hydrogen bonding exhibiting the porous structure.     

基于神经网络的股票收益率预测研究

在金融领域的资产定价模型修正过程中,股市的非线性现象往往被选择性忽视,未纳入模型框架,现有模型亦无法刻画因子之间的非线性定价结构。为解决上述问题,引入了机器学习领域中的神经网络模型,以捕获市场组合收益率、市值、账面市值比三因子间的非线性定价结构,并对股票收益率进行预测。将该模型与经典Fama-French三因子模型在样本外拟合优度、多空策略业绩表现上做了对比,结果表明：神经网络模型能精准捕获市场组合收益率、市值、账面市值比3个因子之间的非线性关系,且在样本外拟合优度、多空策略业绩表现上均要优于传统三因子线性定价模型。     

配合物[RE_2(H_2L)_2(HL)_2(2,6-H_2PDA)(H_2O)_2]·2H_2O的合成、晶体结构及其与DNA作用方式初探

以N-(2-异丙酸)-邻羟基苯甲酰腙(C10H10N2O4,H3L)、2,6-吡啶二甲酸(2,6-H2PDA)与RE(NO3)3·nH2O(RE=Pr,Eu)在室温下反应,合成了配合物1[Pr2(H2L)2(HL)2(2,6-H2PDA)(H2O)2]·2H2O和配合物2[Eu2(H2L)2(HL)2(2,6-H2PDA)-(H2O)2]·2H2O,对其进行了元素分析、红外光谱、紫外光谱等表征,测定了两种配合物的晶体结构.通过紫外吸收光谱、荧光发射光谱和稳态荧光猝灭方法及其与溴化乙锭(EB)的竞争实验研究了两种配合物与小牛胸腺DNA的作用情况.结果表明,两种配合物与小牛胸腺DNA均是以插入方式结合的.     

Crystal structure of a novel two-dimensional supramolecular network based on polyoxoanion and yttriumIII coordination cation

A novel compound (NH⁴)₂Y(H₂O)₈[PMo₁₀V₂O₄₀]·10H₂O has been prepared in an aqueous solution and characterized by elemental analysis, IR, and TG-DTG analysis. X-ray diffraction analysis was carried out on (NH₄)₂Y(H₂O)₈ [PMo₁₀V₂O₄0]·10H₂O single crystal, which crystallizes in the monoclinic system of a space group P21/c witha=0. 9871 (3) nm,b=1. 5424 (5) nm,c=2.7924(9) nm, β = 94.183(5)° and Z=2. In the compound, a two-dimensional network is constructed by the PMo₁₀V₂O ⁵⁻₄₀ anion and the Y(H₂O) ³⁺₈ cation building blocks via hydrogen bonding exhibiting the porous structure.

     

Crystal structure of a novel two-dimensional supramolecular network based on polyoxoanion and yttrium~Ⅲcoordination cation

A novel compound (NH4)2Y(H2O)8[PMo10V2O40]·10H2O has been prepared in an aqueous solution and characterized by elemental analysis, IR, and TG-DTG analysis. X-ray diffraction analysis was carried out on (NH4)2Y(H2O)8 [PMo10V2O40]·10H2O single crystal, which crystallizes in the monoclinic system of a space group P21/C with a=0.9871(3) nm,b=1.5424(5) nm,c=2.7924(9) nm,β=94.183(5)°and Z=2. In the compound, a two-dimensional network is constructed by the PMo10V2O405- anion and the Y(H2O)83 cation building blocks via hydrogen bonding exhibiting the porous structure.     

4,5-二氮芴-9-酮Cu(Ⅱ)配合物的合成、晶体结构和振 动光谱的简正分析

合成了4,5-二氮芴-9-酮的Cu(Ⅱ)配合物。晶体结构分析表明,配合物分子中铜(Ⅱ)分别和来自两配体的四个氮原子及两个水分子中的氧原子配位,处于六配位的配位环境中,两配体基本下于同一平面,两水分子垂直于两配体所在平面,铜(Ⅱ)处于畸变八面体中心。晶体学数据：三斜晶系,P1空间群,a=0.7987(2)nm,b=1.0543(1)nm,c=0.70403(5)nm,α=91.557(8)°,β=96.711(10)°,γ=94.45(1)°.研究了配合物的紫外光谱、荧光光谱,对配体和配合物振动光谱用HyperChem5.11软件包进行理论计算并与实测光谱比较,初步结果帮助解析了过渡金属配合物振动光谱。