首页> 外文期刊>Chemistry: A European journal >Ni-3 versus Ni-30: A Truncated Octahedron Metal-Organic Cage Constructed with [Ni-5(CN)(4)](6+) Squares and Tripodal Tris-tacn Ligands That are Large and Flexible
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Ni-3 versus Ni-30: A Truncated Octahedron Metal-Organic Cage Constructed with [Ni-5(CN)(4)](6+) Squares and Tripodal Tris-tacn Ligands That are Large and Flexible

机译:Ni-3与Ni-30:由[Ni-5(CN)(4)](6+)正方形和三脚架Tris-tacn配体构成的截断的八面体金属有机笼

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摘要

Reactions of trinickel complex of tripodal tristacn ligand N(CH2-m-C6H4-CH(2)tacn)(3) (L, tacn=1,4,7-triazacyclononane) in acetonitrile-methanol solution with and without phosphate led to two complexes of distinct nuclearities, [((NiCl)-Cl-II)(3)(CH3OH)(3)(HPO4)L](PF6) (Ni-3, 1) and [(Ni-5(II)(CN)(4)(H2O)(8)Cl)(6)L-8]Cl-30 (Ni-30, 2). Ligand L takes upward and downward conformation in the structure of 1 and 2, respectively. It is proposed that phosphate directs the upward conformation of Ni3L to form 1. In the absence of phosphate, Ni3L assembles with cyanide ions, which are formed by Ni-catalyzed C-CN bond cleavage of acetonitrile, to give a nano-sized Ni-30 cage. Complex 2 represents a discrete truncated octahedron cage assembled with [Ni-5(CN)(4)](6+) squares and large and flexible triangular ligands, which is scarcely observed for self-assembled metal-organic cages. The magnetic properties of 1 and 2 were examined, showing intriguing magnetic properties.
机译:三脚架tristacn配体N(CH2-m-C6H4-CH(2)tacn)(3)(L,tacn = 1,4,7-三氮杂环壬烷)在含或不含磷酸盐的乙腈-甲醇溶液中的三镍配合物反应导致两个[[((NiCl)-Cl-II)(3)(CH3OH)(3)(HPO4)L](PF6)(Ni-3,1)和[(Ni-5(II)(CN )(4)(H2O)(8)Cl)(6)L-8] Cl-30(Ni-30,2)。配体L分别具有1和2的结构的向上和向下构象。有人提出,磷酸盐指导Ni3L的向上构象形成1。在不存在磷酸盐的情况下,Ni3L与氰化物离子组装,氰化物离子是由Ni催化的乙腈的C-CN键裂解形成的,从而形成纳米级的Ni- 30个笼子。配合物2代表组装有[Ni-5(CN)(4)](6+)正方形和大而灵活的三角形配体的离散的截短的八面体笼子,对于自组装的金属有机笼子几乎没有观察到。检查了1和2的磁性能,显示出令人感兴趣的磁性能。

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