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首页> 外文期刊>Crystal growth & design >Coordination polymers of flexible bis(benzimidazole) ligand: Halogen bridging and metal???arene interactions
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Coordination polymers of flexible bis(benzimidazole) ligand: Halogen bridging and metal???arene interactions

机译：柔性双（苯并咪唑）配体的配位聚合物：卤素桥联和金属芳烃相互作用

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摘要

A new organic ligand, namely 1,4-bis[2-(1-methylbenzimidazol-2-ylmethyl)] benzene (L), was synthesized, and its crystal structure has been determined. The ability of L to form coordination polymers was explored with various metal salts under different conditions. Six complexes of L-[Cu_2(L)I _2], 1; [Cu_2(L)I_2], 2; [Cd_3(L)Cl _6?2DMF], 3; [Cu(L)Cl_2], 4; [Zn(L)I _2?MeOH], 5; and [Cd(L)(NO_3)_2?H _2O]?2THF, 6-have been synthesized by the reaction of L with the corresponding metal salts at room temperature, either by direct mixing or by a layering technique. Single crystal X-ray analyses revealed that complexes 1 and 2 are isomers of each other and that both contain Cu_2I_2 building units. The crystal structure of 1 contains a discrete unit that contains a strong Cu(I)???arene interaction, whereas, in 2, the Cu_2I_2 units act as a linear linker and form a one-dimensional zigzag chain. Complex 3 exhibits a two-dimensional layer in which the 1D polymeric chains of halide bridged Cd(II) ions are linked by the organic ligand L. The crystal structures of 4 and 5 contain a 1D zigzag chain and a discrete hydrogen bonded dimer, respectively. The crystal structure of complex 6 contains nitrate as a counterion and forms an interesting one-dimensional helical chain containing cavities that are occupied by THF molecules. In these crystal structures, the ligand L is found to exhibit four different conformations. The Cambridge Structural Database was used to rationalize the results obtained here and to provide some insight into the metal coordination geometries, the halide bridging of metal centers, as well as metal???arene interactions.
机译：合成了一种新的有机配体，即1,4-双[2-（1-甲基苯并咪唑-2-基甲基）]苯（L），并确定了其晶体结构。在不同条件下用各种金属盐探索了L形成配位聚合物的能力。 L- [Cu_2（L）I _2]的六个配合物，1; [Cu_2（L）I_2]，2; [Cd_3（L）Cl _6→2DMF]，3; [Cu（L）Cl_2]，4; [Zn（L）I _2→MeOH]，5;和[Cd（L）（NO_3）_2→H_2O]→2THF，是通过L与相应的金属盐在室温下反应，通过直接混合或通过分层技术合成的。单晶X射线分析表明，配合物1和2是彼此的异构体，并且都含有Cu_2I_2结构单元。 1的晶体结构包含一个离散的单元，该单元包含一个强的Cu（I）芳烃相​​互作用，而在2中，Cu_2I_2单元充当线性连接体并形成一维之字形链。配合物3表现出二维层，其中一卤化物桥联的Cd（II）离子的一维聚合物链通过有机配体L连接。4和5的晶体结构分别包含一维之字形链和离散的氢键二聚体。 。配合物6的晶体结构包含硝酸盐作为抗衡离子并形成有趣的一维螺旋链，该螺旋链包含被THF分子占据的空穴。在这些晶体结构中，发现配体L表现出四个不同的构象。剑桥结构数据库被用来合理化这里获得的结果，并提供对金属配位几何形状，金属中心的卤化物桥联以及金属芳烃相互作用的一些见解。

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