配合物[Mn(2,2′-bipy)(H_2O)_4]·(m-phth)的水热合成和晶体结构(英文)

0IntroductionAs the active sites of several mononuclear en-zymes are five-or six-coordinate manganese speciescontaining coordinated carboxylate groups,water andnitrogen-donor molecules research on the coordinationcompounds of manganese with such coligands hasgrown[1,2].There has been extensive interest in man-ganese chemistry due to the involvement of manganesein many biosystems and magnetic materials[3￣5].Theisophthalate as a potential bidentate ligand seemsquite suitable for self-assembly s…     

Hydrothermal Synthesis and Crystal Structure of a One-dimensional Manganese（Ⅱ） Compound Bridged by 2,6-Dichlorobenzoic Acid and Water

1 INTRODUCTION In recent years, coordination polymeric frame- works have attracted great attention not only due to their potential applications in the areas of magnetism, nonlinear optics, electronics, catalysis, and molecu- lar recognition and sorption but also to their intri- guing structure topologies[1～8]. The coordination polymers can be specially designed by careful selec- tion of the metal ions with definite coordination geometry, the structure of the connecting ligands, the nature…     

三维羧基氧桥联双核铜配合物[Cu2(nta)(Phen)3]NO3·6H2O的合成、表征与晶体结构

由H₃nta(H₃nta=nitriloriacetic acid)、Phen(Phen=1,10-phenanthroline)与Cu²⁺离子反应,合成标题配合物[Cu₂(nta)(Phen)₃]NO₃·6H₂O。该配合物的晶体属单斜晶系,空间群为P2₁/c。在配合物中,2个中心铜原子分别与配位原子构成变形八面体和变形三角双锥结构。晶体中结构单元通过分子间氢键和π-π堆积,形成了三维网络结构。TG分析结果表明标题配合物在194 ℃以下是稳定的。     

二维配位聚合物[Mn(FA)_2(4,4''''-bipy)]_n的合成、晶体结构及量子化学研究

配位聚合物通常是通过某种有机配体与金属的配位几何选择以及无限网络的拓扑结构控制而形成的具有无限结构的化合物[1],其结构新颖并具有不寻常的光电效应、非线性光学性能、磁性、超导及催化等诸多具有诱人应用前景的独特性能。因此,近二十多年来倍受化学家和材料学家的重视[2     

一维链状镉配位聚合物[Cd(phen)(2，4，6-TMBA)2(H2O)]n的水热合成、晶体结构及热稳定性

在甲醇和水的混合溶剂中用2，4，6-三甲基苯甲酸(2，4，6-TMBA)、邻菲咯啉(phen)、高氯酸镉为原料采用水热法合成了一维链状配位聚合物Cd(phen)(2，4，6-DMBA)₂(H₂O)。该配合物晶体属四方晶系，空间群I4₁。晶体中镉原子与1个邻菲咯啉的2个N原子、2个2，4，6-三甲基苯甲酸酸根中的3个羧基氧原子及1个水分子中的氧原子配位，晶胞参数:a=2.042 5(7) nm，c=1.395 2(5) nm，V=5.820(3) nm³，D_c=1.454 g·cm^-3，Z=8，F(000)=2 608，GooF=1.064，R₁=0.034 8，wR₂=0.070 4。形成六配位的变形八面体结构。对晶体进行了热稳定性分析，结果表明:配合物在240.0 ℃以下稳定性好。     

配合物[Mn(2,2′-bipy)(H2O)4]·(m-phth)的水热合成和晶体结构

A mononuclear manganese complex [Mn(2,2′-bipy)(H₂O)₄]·(m-phth) (2,2′-bipy=2,2′-bipyridine, m-phth=isophthalate) has been synthesized by hydrothermal methods. The crystal structure was determined by single-crystal X-ray diffraction. The crystal is of orthorhombic, space group Pnna with a=0.766 8(8) nm, b=2.050 2(2) nm, c=1.247 0(13) nm, V=1.960 4(4) nm³, Z=4, M_r=447.30, D_c=1.376 g·cm^-3, μ=0.722 mm^-1, F(000)=924, R_int=0.027 0, R=0.028 0 and wR=0.075 5. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 2,2′-bipyradine and four oxygen atoms from water molecules, completing an octahedral coordination geometry. The isophthalate molecules are included in the lattice and connected to Mn(2,2′-bipy)(H₂O)₄ by hydrogen bonding interactions to form a three-dimensional supramolecular structure. CCDC:286965.     

配合物[Mn(2,2''-bipy)(H2O)4]·(m-phth)的水热合成和晶体结构

A mononuclear manganese complex [Mn(2,2'-bipy)(H2O)4]·(m-phth) (2,2'-bipy=2,2'-bipyridine, m-phth=isophthalate) has been synthesized by hydrothermal methods. The crystal structure was determined by singlecrystal X-ray diffraction. The crystal is of orthorhombic, space group Pnna with a=0.766 8(8) nm, b =2.050 2(2)0.027 0, R=0.028 0 and wR=0.075 5. In the crystal the manganese atom is six-coordinated by two nitrogen atoms from 2,2'-bipyradine and four oxygen atoms from water molecules, completing an octahedral coordination geometry. The isophthalate molecules are included in the lattice and connected to Mn(2,2'-bipy)(H2O)4 by hydrogen bonding interactions to form a three-dimensional supramolecular structure. CCDC:286965.     

配位聚合物[Mn(2，4，6-TMBA)2(H2O)3]n·2nH2O的水热合成和晶体结构

The title compound, [Mn(2,4,6-TMBA)₂(H₂O)₃]_n·2nH₂O(1), where 2,4,6-TMBA=2,4,6-trimethylbenzoic acid, was synthesized and its crystal structure was determined by X-ray diffraction analysis. The crystal is of monoclinic, space group C2/c with a=2.929 9(6) nm, b=1.036 4(2) nm, c=8.222 04(17) nm, V=2.494 7(9) nm³, Z=4, M=471.40, D_c=1.255 g·cm^-3, μ=0.571 mm^-1, F(000)=996, R_int=0.029 4, R=0.037 6 and wR=0.094 9. The Mn atoms are octahedrally coordinated by two O atoms of two ligands and four O atoms of water. The carboxyl group coordinates to Mn(Ⅱ) in the mode of monodentate, while the O atoms of water molecules coordinates in bridging mode. The complex shows a one-dimensional chain structure bridged by water molecules. CCDC: 297750.     

纳米TiO2修饰碳糊电极伏安法测量痕量铟

采用溶胶-凝胶法制备了纳米TiO2粉末,成功地将其修饰在碳糊电极上,用阳极溶出伏安法考察了修饰电极测量痕量铟的优化条件及其电化学稳定性.结果表明,在pH=5.4的Hac-NaAc缓冲液中,当In3 在纳米TiO2修饰碳糊电极表面富集时间为200s,电位扫描速率控制为200mV/s时,修饰电极在伏安图上能出现1个灵敏的氧化峰,峰电位为-0.832V,利用该峰可以进行痕量铟的检测;峰电流与In3 浓度在1.0×10-11～1.0×10-9mol/L的范围内成良好线关系,相关系数为0.995,检出限为0.125×10-11mol/L;修饰电极稳定性较好,用于实际水样中钢含量的测定,平均回收率为96.16%,结果令人满意.同时循环伏安和交流阻抗实验表明,铟在修饰电极上电化学氧化为不可逆过程,受电荷传质和扩散过程混合控制;该电极过程的平均活化能为72.36kJ/mol.     

配位聚合物[Ho2(TsGlyH)6(H2O)4]n·4nH2O的水热合成、晶体结构和抑菌活性

采用水热方法合成高氯酸钬与对甲苯磺酰甘氨酸1∶3型配合物[Ho2(TsG lyH)6(H2O)4]n.4nH2O。配合物晶体属三斜晶系,P i空间群,晶胞参数为:a=1.3927(1)nm,b=1.6645(2)nm,c=1.6485(2)nm,α=73.93(8),°β=76.42(1),γ=75.42(1),°V=5.569(7)nm3,Z=2,D c=1.623 mg/m3,M r=1746.04,F(000)=1806,Rl=0.0274,wR2=0.0553。每一个二聚单元[Ho2(TsG lyH)6(H2O)4]中的Ho(III)离子由四个对甲苯磺酰甘氨酸的羧基桥相连,同时二聚单元中的每一个Ho(III)离子再进一步通过另外两个羧基桥与邻近的稀土离子相连,从而构成一维链状结构。