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首页> 外文期刊>Crystal growth & design >Adjusting the Porosity and Interpenetration of Cadmium(II) Coordination Polymers by Ligand Modification: Syntheses, Structures, and Adsorption Properties
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Adjusting the Porosity and Interpenetration of Cadmium(II) Coordination Polymers by Ligand Modification: Syntheses, Structures, and Adsorption Properties

机译:通过配体改性调节镉(II)配位聚合物的孔隙率和互穿性:合成,结构和吸附性能

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摘要

A series of structurally related rigid imidazole ligands, 1,4-bis(imidazol-1-yl)benzene (L-1), 1,4-bis(benzoimidazol-1-yl)benzene (L-2), and 4,4'-bis(benzoimidazol-1-yl)biphenyl (L-3), have been utilized to construct coordination polymers. The reactions of CdX2 (X = BF4- or ClO4-) with these ligands afford three new three-dimensional networks, {[Cd(L-1)(3)](BF4)(2)(CHCl3)(2)}(infinity) (1), {[Cd(L-2)(3)]ClO4)(2)(CHCl3)(4)(CH3OH)(2)}(infinity) (2), and {[Cd(L-3)(3)](ClO4)(2)}(infinity) (3). Compounds 1-3 are all alpha-Po metal-organic frameworks (MOFs) based on six-connected Cd-II nodes which are octahedrally coordinated by six nitrogen atoms of ligand molecules. Complex 2 represents a distorted alpha-Po framework with noninterpenetration, whereas 1 and 3 both exhibit a double interpenetrating alpha-Po network. These results suggest that the degree of interpenetration is tunable by ligand modifications, that is, varying the ligand spacer or terminal group. The three complexes exhibit a different void volume in their network. Gas adsorption measurements indicate that 3 possesses moderate gas-adsorption ability for CO2, and the progress of adsorption and desorption is reversible.
机译:一系列结构相关的刚性咪唑配体,1,4-双(咪唑-1-基)苯(L-1),1,4-双(苯并咪唑-1-基)苯(L-2)和4, 4'-双(苯并咪唑-1-基)联苯(L-3)已用于构建配位聚合物。 CdX2(X = BF4-或ClO4-)与这些配体的反应提供了三个新的三维网络,{[Cd(L-1)(3)](BF4)(2)(CHCl3)(2)}(无穷大)(1),{[Cd(L-2)(3)] ClO4)(2)(CHCl3)(4)(CH3OH)(2)}(无穷大)(2)和{[Cd(L- 3)(3)](ClO4)(2)}(无穷大)(3)。化合物1-3都是基于六连接的Cd-II节点的α-Po金属有机骨架(MOF),它们由配体分子的六个氮原子八面体配位。配合物2代表扭曲的alpha-Po骨架,且互不穿透,而复合物1和3都显示出双重互穿的alpha-Po网络。这些结果表明,互穿度可通过配体修饰来调节,即,改变配体间隔基或端基。这三种络合物在其网络中表现出不同的空隙体积。气体吸附测量表明3对CO2具有中等的气体吸附能力,吸附和解吸的过程是可逆的。

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