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首页> 外文期刊>Crystal growth & design >Structural diversity in metal-organic frameworks built from rigid tetrahedral [Si(p- C_6H_4CO_2)_4] ~(4-) struts
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Structural diversity in metal-organic frameworks built from rigid tetrahedral [Si(p- C_6H_4CO_2)_4] ~(4-) struts

机译:由刚性四面体[Si(p- C_6H_4CO_2)_4]〜(4-)撑杆构建的金属有机框架的结构多样性

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The silicon-based connector [Si(p-C_6H_4CO _2)_4]~(4-) (L) has been employed in the construction of six new metal-organic framework (MOF) materials, all of which have been characterized by single crystal X-ray diffraction techniques. The isostructural frameworks [Cd_2(L)(H_2O)_2] ?(DMA) and [Mn_2(L)(H_2O)_2]?(DMA) _(2.5), IMP-8Cd and IMP-8Mn, respectively, contain extended [M(CO _2)_2]_n chains, often termed rod SBUs (secondary building units), which are cross-linked into a 3D network by tetrahedral L struts to give microporous networks. In contrast, [Cu_2(L)(H _2O)_2]?(DMA)_(12) (IMP-9) contains dinuclear paddle-wheel Cu_2(CO_2)_4 SBUs connected together with L struts to give an overall PtS type net. [Me_2NH _2]_2[Cd_3(L)_2(H_2O) _2]?(DMA)_8(H_2O)_8, [Me _2NH_2]_2[Zn_3(L)_2] ?(DMF)_6, and [Me_2NH_2]_2[Zn _3(L)_2]?(DMF)_3 (IMP-10, IMP-11, and IMP-12, respectively) all contain anionic 3D frameworks which are charge balanced by the presence of dimethylammonium cations within their pores. These dimethylammonium cations arise from the hydrolysis of DMA or DMF, or they can be introduced directly by addition of [Me_2NH_2]Cl. IMP-10, IMP-11, and IMP-12 all contain trinuclear octacoordinate SBU nodes, although subtle differences in the geometry of these SBUs result in the formation of different network topologies in each case. Examples of MOFs containing rigid tetrahedral carboxylate connectors are currently uncommon, and several previously unobserved topologies are introduced in this study.
机译:基于硅的连接器[Si(p-C_6H_4CO _2)_4]〜(4-)(L)已用于构建六种新的金属有机骨架(MOF)材料,所有这些材料均具有单晶特征X射线衍射技术。同构框架[Cd_2(L)(H_2O)_2]δ(DMA)和[Mn_2(L)(H_2O)_2]δ(DMA)_(2.5),IMP-8Cd和IMP-8Mn分别包含扩展的[ M(CO _2)_2] _n链,通常称为杆状SBU(二级建筑单元),它们通过四面体L撑杆交联到3D网络中,从而形成微孔网络。相反,[Cu_2(L)(H _2O)_2]?(DMA)_(12)(IMP-9)包含双核桨叶式Cu_2(CO_2)_4 SBU和L撑杆连接在一起,形成了一个整体的PtS型网。 [Me_2NH _2] _2 [Cd_3(L)_2(H_2O)_2]?(DMA)_8(H_2O)_8,[Me _2NH_2] _2 [Zn_3(L)_2]?(DMF)_6和[Me_2NH_2] _2 [ Zn _3(L)_2] 2(DMF)_3(分别为IMP-10,IMP-11和IMP-12)均含有阴离子3D骨架,这些骨架通过其孔内存在的二甲基铵阳离子而达到电荷平衡。这些二甲基铵阳离子是由DMA或DMF水解产生的,或者可以通过添加[Me_2NH_2] Cl直接引入。 IMP-10,IMP-11和IMP-12都包含三核八坐标SBU节点,尽管这些SBU的几何形状之间的细微差异会导致每种情况下形成不同的网络拓扑。包含刚性四面体羧酸盐连接器的MOF实例目前并不常见,并且在此研究中引入了几种以前未观察到的拓扑。

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