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首页> 外文期刊>Crystal growth & design >Structural Diversity Modulated by the Ratios of a Ternary Solvent Mixture: Syntheses, Structures, and Luminescent Properties of Five Zinc(II) Metal-Organic Frameworks
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Structural Diversity Modulated by the Ratios of a Ternary Solvent Mixture: Syntheses, Structures, and Luminescent Properties of Five Zinc(II) Metal-Organic Frameworks

机译：由三元溶剂混合物的比例调节的结构多样性：五个锌（II）金属-有机骨架的合成，结构和发光性质

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A series of metalorganic frameworks (MOFs) were systematically synthesized through a solvent-ratio-controlled assembly: {[Et2NH2](2)[Zn-5(L)(2)(H2O)(4)].2C(2)H(5)OH.2H(2)O}(n) (1), {[Et2NH2](4)[Zn-7(HL)(2)(H2L)(2)].4C(2)H(5)OH.6H(2)O}(n) (2), {[Et2NH2](4)[Zn-6(L)(2)(H2L)(H2O)(2)].2C(2)H(5)OH.2H(2)O}(n) (3), {[Et2NH2](4)[Zn-4(L)(2)(H2O)(2)].4H(2)O}(n) (4), and {[Et2NH2](2)[Zn-2(L)].C2H5OH}(n) (5) (H6L = [1,1';4',1?]terphenyl-3,5,2',5',3",5"-hexacarboxylic acid, DEF = N,N-diethylformamide). Along with the altering of ratios of the ternary mixed-solvent DEF/H2O/C2H5OH used in the synthetic processes, the coordination modes of the ligand change, which further leads to the different structures of resultant complexes. Owing to diverse metal centers and clusters and distinct ligand coordination modes, these five complexes exhibit totally different and novel topologies: complex 1 displays a (5,8)-connected 3D net, in which the 8-connected nodes are based on trinuclear metal clusters; complexes 24 all exhibit 3D 4-nodal nets based on two kinds of metal centers and two kinds of ligand coodination modes; complex 5 shows a 6-connected uninodal 3D net. These five complexes have been characterized by single-crystal X-ray diffraction, thermogravimetric (TG) analyses, elemental analyses (EA), and powder X-ray diffraction (PXRD). Luminescent properties of complexes 1-5 at room temperature and 77 K show that all the five complexes exhibit temperature-dependent emission properties. The calculation of density of states (DOS) was carried out to get a better insight into the nature of the luminescence. The obvious change of spectral colors of 3 at different temperatures suggests that it may be well applied in temperature-sensing devices.
机译：通过溶剂比例控制的组装系统地合成了一系列金属有机骨架（MOF）：{[Et2NH2]（2）[Zn-5（L）（2）（H2O）（4）]。2C（2）H （5）OH.2H（2）O}（n）（1），{[Et2NH2]（4）[Zn-7（HL）（2）（H2L）（2）]。4C（2）H（5 ）OH.6H（2）O}（n）（2），{[Et2NH2]（4）[Zn-6（L）（2）（H2L）（H2O）（2）]。2C（2）H（ 5）OH.2H（2）O}（n）（3），{[Et2NH2]（4）[Zn-4（L）（2）（H2O）（2）]。4H（2）O}（n ）（4）和{[Et2NH2]（2）[Zn-2（L）]。C2H5OH}（n）（5）（H6L = [1,1'; 4'，1？] terphenyl-3,5 ，2′，5′，3″，5″-六羧酸，DEF ＝ N，N-二乙基甲酰胺。随着合成过程中所用三元混合溶剂DEF / H2O / C2H5OH比例的改变，配体的配位方式也发生变化，这进一步导致了所得配合物的结构不同。由于不同的金属中心和簇以及独特的配体配位模式，这五种配合物表现出完全不同的新颖拓扑：配合物1显示了一个（5,8）连接的3D网络，其中8个连接的节点基于三核金属簇;配合物24均显示出基于两种金属中心和两种配体共配化模式的3D 4节点网。复合体5显示了6个连接的单节点3D网络。通过单晶X射线衍射，热重（TG）分析，元素分析（EA）和粉末X射线衍射（PXRD）表征了这五个络合物。配合物1-5在室温和77 K下的发光特性表明，所有五个配合物均表现出温度依赖性的发射特性。进行状态密度（DOS）的计算是为了更好地了解发光的性质。 3在不同温度下光谱颜色的明显变化表明它可以很好地应用于温度感应设备中。

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