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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Metal Coordination Polymers of 2,3-Bisimidazol-1-ylquinoxaline:Syntheses, Crystal Structures, and Luminescent Properties
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Metal Coordination Polymers of 2,3-Bisimidazol-1-ylquinoxaline:Syntheses, Crystal Structures, and Luminescent Properties

机译:2,3-双咪唑-1-基喹喔啉的金属配位聚合物:合成,晶体结构和发光性能

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摘要

Three new metal-organic coordination polymers, namely, [Zn(μ_2-BiImQuin)(OAc)_2]?H_2O (1), [Zn(μ_2-BiImQuin)_2(H_2O)_2]_2? 4Cl?H_2O (2), and [Mn(μ_2-BiImQuin)_2(N_3)_2]?4H_2O (3) were prepared by reaction of the corresponding transition metal salt with new rigid ligand 2,3-bisimidazol-1-ylquinoxaline (L) with diffusion or solution methods (BiImQuin = 2,3-bisimidazol-1-ylquinoxaline). All the complexes were characterized by elemental analysis, IR, TGA, PXRD, and single crystal X-ray diffraction determination. A one-dimensional single chain was observed in complex 1, however one-dimensional beadlike double chains were observed in complexes 2 and 3. In the three complexes, the rigid didentate ligands bridged the metal ions into similar "zigzag" chain, and two "zigzag" chains are arranged into beadlike double chain in complexes 2 and 3, where each metal ion is coordinated with four different didentate BiImQuin rather than two. On the other hand, the anions do great influence on the final supramolecular structure through coordination behavior and hydrogen-bonding interactions. The complexes 1 and 2 display strong room temperature photoluminescence in visible region, which may be assigned to ligand-tometal charge-transfer.
机译:三种新的金属有机配位聚合物,即[Zn(μ_2-BiImQuin)(OAc)_2]?H_2O(1),[Zn(μ_2-BiImQuin)_2(H_2O)_2] _2? 4Cl?H_2O(2)和[Mn(μ_2-BiImQuin)_2(N_3)_2]?4H_2O(3)通过相应的过渡金属盐与新的刚性配体2,3-双亚咪唑-1-基喹喔啉( L)采用扩散或溶液法(BiImQuin = 2,3-bisimidazol-1-ylquinoxaline)。通过元素分析,IR,TGA,PXRD和单晶X射线衍射测定对所有配合物进行表征。在配合物1中观察到一维单链,但是在配合物2和3中观察到一维珠状双链。在这三种配合物中,刚性二齿配体将金属离子桥接成相似的“之字形”链,而两个“之字形链在复合物2和3中排列成珠状双链,其中每个金属离子与四个不同的配位的BiImQuin(而不是两个)配位。另一方面,阴离子通过配位行为和氢键相互作用对最终的超分子结构有很大影响。配合物1和2在可见光区域显示出强的室温光致发光,这可以归因于配体到金属的电荷转移。

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