二维双层蜂窝状锌配合物的合成、晶体结构及性质研究

利用水热反应合成了一种新的二维双层蜂窝状锌配合物{[Zn2(atz)3(N3)].H2O}n(1)(atz=5-氨基四氮唑),并用元素分析,红外光谱和X-射线单晶衍射对其结构进行了表征,该配合物属单斜晶系,C2/m空间群,晶胞参数为:a=1.0397(2)nm,b=1.7927(4)nm,c=1.109 2(2)nm,V=1.887 0(7)nm3,Z=4。该锌配合物是由N3-和原位合成的5-氨基四氮唑阴离子构成,拓扑分析表明该化合物显示出独特的4-连接六边形的蜂窝双层结构。同时还测定了该化合物的热稳定性及荧光性质。     

一种2,2’-联咪唑镉化合物的荧光、理论计算和结构研究

通过水热反应合成了一种新颖的镉-联咪唑化合物[Cd(BIm)₂](ClO₄)(OH)·2H₂O (1) (BIm=2,2'-biimidazole),并对其进行了单晶X-射线衍射结构表征。该化合物具有孤立结构特征,镉原子与4个氮原子配位形成1个扭曲的四面体。光致发光研究发现该化合物发出蓝色荧光。理论研究结果显示该荧光来自于LMCT机理。本文还对其红外光谱进行了报道。     

一种2, 2’-联咪唑镉化合物的荧光、理论计算和结构研究

通过水热反应合成了一种新颖的镉-联咪唑化合物[Cd(BIm)2](ClO4)(OH)·2H2O(1)(BIm=2,2′-biimidazole),并对其进行了单晶X-射线衍射结构表征。该化合物具有孤立结构特征,镉原子与4个氮原子配位形成1个扭曲的四面体。光致发光研究发现该化合物发出蓝色荧光。理论研究结果显示该荧光来自于LMCT机理。本文还对其红外光谱进行了报道。     

Syntheses and Crystal Structures of Two Cyano-bridged Bimetallic Complexes [Ce(DMSO)_4(H_2O)_3Fe(CN)_6]·H_2O and [La(DMSO)_4(H_2O)_3Co(CN)_6]·H_2O(DMSO = Dimethylsulfoxide)

1INTRODUCTION Recently,cyano-bridged lanthanide-transition me-tal complexes have been extensively investigateddue to their potential applications as precursors in the preparation of rare earth orthoferrites,fluores-cent and magnetic materials[1].Various complexes of this system have been obtained in order to ex-plore the relations between structures and pro-perties by using different ligands,such as DMF,4,4?-bipy,and so on,to fill the coordination sites of lanthanide ions[2～9].But up to…     

Structure and Photophysical Properties of an Upconversion Holmium-mercury Compound with a 2-D Layer-like Motif

Using a hydrothermal reaction,a novel holmium-mercury compound{[Ho(IA)(HIA)₂(H2 O)₂]_2-(Hg₃Br₈)}n(nHgBr₂)·2 nNO₃(1,HIA is isonicotinc acid)was synthesized and its crystal structure was characterized by single-crystal X-ray diffraction.Compound 1 crystallizes in monoclinic system,space group P2/c with a=13.0647(6),b=9.4659(3),c=26.0832(14)?,β=97.522(4)°,V=3197.9(2)?³,C₃₆H₃₆Br₁₀Hg₄Ho₂N₈O₂₂,M_r=2863.95,Z=2,D_c=2.974 g/cm³,μ(Mo Kα)=18.331 mm^–1 and F(000)=2575.It displays a two-dimensional(2 D)layer-like structure.A solid-state photoluminescence experiment revealed that it shows upconversion green emission.The emission peaks should come from the ⁵I₈→⁵G₆ and ⁵S₂→⁵I₈ characteristic emission of the 4 f electrons of the Ho3+ion.Compound 1 has a CIE chromaticity coordinate(0.1774,0.526).A solid-state UV-visible diffuse reflectance spectrum unveiled that this compound has a wide optical band gap of 3.26 eV.     

A New 3-D Lanthanide Porphyrin: Synthesis,Structure and Photophysical Properties

A new lanthanide porphyrin, [Sm III(H3TPPSIII)]n·n H2O(1, H6 TPPS = tetra(4-sulfonatophenyl)porphyrin), has been synthesized through a hydrothermal reaction and structurally characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in the P4/mcc space group of tetragonal system: a = 15.3683(12), c = 9.895(2) A, V = 2337.0(5) A3, C44H29N4O13S4 Sm, Mr =1100.30, Z = 2, Dc = 1.564 g/cm3, S = 1.063, μ(Mo Kα) = 1.502 mm–1, F(000) = 1102, R = 0.0583 and w R = 0.1666. Compound 1 is characteristic of a three-dimensional(3-D) framework with a slightly distorted square-antiprism eight-coordinated Sm3+ ion. Fluorescent study revealed that compound 1exhibits an emission in the red region. The fluorescence quantum yield and lifetime of 1 were determined to be 3.5% and 9.1 ns, respectively. UV-vis absorption spectra were also investigated.     

Synthesis and Structural Characterization of a Cyano-bridged 1-D Lanthanum(Ⅲ)-iron(Ⅲ) Complex [La(DMSO)_5(H_2O)](μ-CN)_2[Fe(CN)_4]·H_2O

A new lanthanumⅢ-ironⅢ complex [La(DMSO)5(H2O)](μ-CN)2[Fe(CN)4]·H2O 1 (DMSO=dimethylsulfoxide) has been prepared by a facile approach,ball-milling method,and characterized by X-ray diffraction. The crystal belongs to monoclinic,space group P21/n with a= 9.7125(3),b=21.5336(7),c=14.3804(5),β=93.242(3)o,C16H34FeLaN6O7S5,Mr=777.55,V =3002.8(2)3,Z=4,Dc=1.720 g/cm3,S=1.053,μ(MoKα)=2.278 mm–1,F(000)=1564,R= 0.0490 and wR=0.1270. The crystal structure analysis of 1 reveals a slightly distorted square-antiprism eightfold-coordinated La(Ⅲ) ion and a 1-D zigzag chain structure extending through the Fe-CN-La-NC-Fe linkages. The [La(DMSO)5(H2O)](μ-CN)2[Fe(CN)4] species are held together via hydrogen bonds to form a three-dimensional framework.