2-氨基对苯二甲酸根及2-咪唑烷酮构筑的镉(Ⅱ)配位聚合物的合成、晶体结构及荧光性质

以一种尿素的衍生物2-咪唑烷酮为溶剂,采用脲热法合成了一个新的配位聚合物[Cd(NH₂bdc)(e-urea)]_n(1)(H₂NH₂bdc为2-氨基对苯二甲酸,e-urea为2-咪唑烷酮),并对其结构和荧光性质进行了研究。单晶结构分析结果表明,标题化合物的中心镉(Ⅱ)离子分别与2-氨基对苯二甲酸根配体的羧基氧原子和溶剂氧原子配位形成七配位的变形五角双锥结构。相邻的中心镉(Ⅱ)离子通过溶剂氧原子和配体羧基基团的连接,形成无限的一维链。这些一维的链进一步通过2-氨基对苯二甲酸根配体的连接最终形成了具有一维孔道的三维框架结构。研究表明,该化合物在室温下能发出较强的蓝色荧光。     

ZnO纳米纤维的静电纺丝及其光催化性能的研究

以聚乙烯醇溶液为络合剂与醋酸锌反应制得前驱体溶液,采用静电纺丝法制备PVA/Zn(Ac)2复合纳米纤维,经过高温煅烧得到直径为100 nm的ZnO纳米纤维,采用差热-热重分析、红外光谱分析、X射线粉末衍射分析及扫描电镜等手段对其进行了表征.光催化降解酸性品红溶液的实验结果表明,太阳光照65 min使质量浓度为45 mg/L酸性品红水溶液的脱色率达93%;另外,重复使用ZnO纳米纤维4次之后,其光催化降解率仍能达到70%以上.这充分说明ZnO纳米纤维具有良好的光催化性能.     

固载化环糊精与污染物的吸附作用

通过固载化环糊精与污染物的作用,探讨了固载化环糊精与污染物的结合形态及方式。实验结果表明:固载化环糊精对苯酚和苯胺的吸附主要是物理吸附,对金属离子以化学吸附为主。     

Synthesis, Crystal Structure and Photocatalytic Properties of a Supramolecular Assembly Based on Keggin Polyoxotungstate

A new supramolecular compound (4,4'-bipyH)4[SiW12O40](4,4'-bipy) (4,4'-bipy = 4,4'-bipyridine) was synthesized hydrothermally and characterized by single-crystal X-ray diffraction and IR spectrum. The crystallography analysis for the title compound reveals that the crystal crystallizes in monoclinic, space group C2/m with a = 22.2767(12), b = 21.1879(11), c = 15.6942(8) , β = 97.068(3)°, V = 7351.3(7) 3, C50H44N10O40SiW12, Mr = 3659.24, Z = 4, Dc = 3.306 g/cm3, F(000) = 6544, GOOF = 1.137, R = 0.0577 and wR = 0.1579. The title compound consists of a discrete Keggin-type [SiW12O40]4- anion, one 4,4'-bipy and four protonated (4,4'-bipyH)+ cations. The [SiW12O40]4- anion and protonated 4,4'-bipy are connected to form a supramolecular structure by hydrogen bonds. Meanwhile, the title compound exhibits good photocatalytic activity for color degradation of Rhodamine-B dye solution under visible-light irradiation.     

2-氨基对苯二甲酸根及2-咪唑烷酮构筑的镉(Ⅱ)配位聚合物的合成、晶体结构及荧光性质

以一种尿素的衍生物2-咪唑烷酮为溶剂,采用脲热法合成了一个新的配位聚合物[Cd(NH2bdc)(e-urea)]n(1)(H2NH2bdc为2-氨基对苯二甲酸,e-urea为2-咪唑烷酮),并对其结构和荧光性质进行了研究。单晶结构分析结果表明,标题化合物的中心镉(Ⅱ)离子分别与2-氨基对苯二甲酸根配体的羧基氧原子和溶剂氧原子配位形成七配位的变形五角双锥结构。相邻的中心镉(Ⅱ)离子通过溶剂氧原子和配体羧基基团的连接,形成无限的一维链。这些一维的链进一步通过2-氨基对苯二甲酸根配体的连接最终形成了具有一维孔道的三维框架结构。研究表明,该化合物在室温下能发出较强的蓝色荧光。     

Synthesis and Crystal Structure of a New Complex [Cd（C20H14N4）2Cl2]

The title compound [Cd(C20H14N4)2Cl2] 1 was synthesized via the hydrothermal reaction of CdCl2·7H2O and NaOH with 1,3-bis(benzimidazol-2-yl)benzene (BMB), and characterized by elemental analysis and infrared spectra. The crystal of 1 crystallizes in monoclinic, space group C2/c with a = 21.021(6), b = 9.489(3), c = 18.302(6), β = 108.686(6)o, V = 3458.2(19)3, Z = 4, C40H28CdN8Cl2, Mr = 804.01, Dc = 1.544 g/cm3, F(000) = 1624 and μ(MoKα) = 0.829 mm-1. The final R = 0.0306 and wR = 0.0779 for 3334 observed reflections with I > 2σ(I) and R = 0.0796 and wR = 0.0360 for all data. The cadmium atom is four-coordinated by the BMB ligands and Cl atom with a tetrahedral geometry. The extensive N-H···N hydrogen bonding interactions are observed in the structure, which further extend the [Cd(C20H14N4)2Cl2] units into a 1D structure. The thermogravimetric analysis measurement showed that compound 1 has thermal stability as no strictly clean weight loss step occurred below 425 ℃.     

多孔活性硅胶的制备及吸附性能的研究

以硅酸钠和氯化铵为原料,通过添加表面活性剂制备高吸附活性的多孔硅胶.采用SEM,IR和XRI)等手段对硅胶样品的结构和形貌进行表征,并利用紫外分光光度法研究硅胶样品对垃圾渗滤液中有机污染物的吸附性能.结果表明,合成的硅胶样品是由纳米量级的无定形二氧化硅颗粒组成的多孔性、疏松状物质,对垃圾渗滤液中的有机物分子具有较强的吸...     

SnO2掺杂对TiO2/Si纳米复合材料性能的影响

采用溶胶-凝胶法在p-型单晶硅的表面镀上一层TiO2-SnO2纳米复合薄膜,并在一定的温度下煅烧得到TiO2-SnO2/Si复合材料.实验研究发现,在TiO2中掺杂一定量的SnO2会使TiO2/Si复合材料的光电压增强,且SnO2的掺杂会抑制TiO2的晶相转变,使复合材料的高温稳定性增强.另外,SnO2的掺杂量和煅烧温度对复合材料的光电压都有影响.当SnO2掺杂量约为20%,煅烧温度为600℃时复合材料的光电压最强.     

Unprecedented Pseudo Water Tapes Stabilized by a One-dimensional Cu（Ⅱ） Coordination Polymer

A new compound,[Cu(mal)(tmdpy)(H2O)]·4H2O(1,H2mal = malonic acid,tmdpy = 4,4'-trimethylenedipyridine) has been synthesized by the hydrothermal synthesis and structurally characterized by X-ray crystallography. It crystallizes in triclinic,space group P1 with a = 9.1662(6),b = 10.6266(7),c = 11.3056(7) ,α = 84.6390(10),β = 72.1030(10),γ = 73.0420(10) o,V = 1002.37(11) 3,C16H26CuN2O9,Mr = 453.93,Z = 2,Dc = 1.504 g/cm3,μ = 1.140 mm-1,F(000) = 474,R = 0.0375 and wR = 0.0975 for 3187 observed reflections(I > 2σ(I)) . In the structure of 1,the tmdpy ligands link the [Cu(mal)(H2O) ] units into an infinite chain,and the water molecules and carboxylate oxygen donors(O(2) and O(4)) from the mal ligands cooperatively built an interesting hydrogen bonding network with unprecedented pseudo water tape substructures.     

Synthesis,Structure and Luminescent Property of a New Zn(Ⅱ) Coordination Polymer Based on 1,3,5-Benzenetricarboxylate and 4,4'-Bipyridine Ligands

A new Zn(II) coordination polymer [Zn3(BTC)2(4,4'-bpy)(CO)2]n(1, H3 BTC =1,3,5-benzenetricarboxylic acid, 4,4'-bpy = 4,4'-bipyridine) has been prepared through urothermal reaction of zinc nitrate hexahydrate with 1,3,5-benzenetricarboxylic acid and 4,4'-bipyridine, and characterized by elemental analysis, IR spectroscopy, TGA and powder XRD, and its crystal structure was determined by single-crystal X-ray diffraction analysis. The title compound crystallizes in the monoclinic system, space group C2/c, with a = 10.262(3), b = 18.838(5), c =15.083(4) A, β = 99.203(4)o, V = 2878.3(14) A3, C30H14Zn3N2O14, Mr = 822.54, Z = 4, Dc = 1.898g/cm3, μ = 2.561 mm-1, F(000) = 1640, R = 0.0363 and w R = 0.0932 for 2828 observed reflections(I 2σ(I)). X-ray analysis shows that the asymmetric unit of the title compound contains two crystallographically unique Zn(II) atoms which are connected by BTC3- ligands and 4,4'-bpy coligands to form a 3D framework with 1D channels. The solid luminescence of ligand and the title complex was also studied at room temperature.