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首页> 外文期刊>Crystal growth & design >Solvent- and Temperature-Induced Multiple Crystal Phases: Crystal Structure, Selective Adsorption, and Separation of Organic Dye in Three S-Containing {[Cd(MIPA)](n)}(n-) Homologues
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Solvent- and Temperature-Induced Multiple Crystal Phases: Crystal Structure, Selective Adsorption, and Separation of Organic Dye in Three S-Containing {[Cd(MIPA)](n)}(n-) Homologues

机译：溶剂和温度诱导的多晶相：晶体结构，选择性吸附和有机染料在三个含S的{[Cd（MIPA）]（n）}（n-）同源物中的分离

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摘要

Three S-containing highly porous metal-organic frameworks, namely, [(CH3)(2)NH2)Cd(MIPA)(n)center dot xG(n = 4 (1), 2 (2), 1 (3) G = guest of DMF/DMA and H2O), featuring with high adsorption capacities and high selectivity for methylene blue (MB), were successfully assembled by subtly varying the synthesis conditions including solvents and temperatures. Compounds 1-3 crystallize in P2(1)/c, I2/a, and R3m, respectively. The anionic frameworks of them are homologues and multiple crystal phases of the {[Cd(MIPA)](n)}(n-). Compounds 1 and 2 demonstrate the same 3;6-connected binodal net (4(2)center dot 6) (4(8)center dot 6(4)center dot 8(3)), encapulating ca. 18 angstrom x 18 angstrom hexagonal channels and three other types of micropous channels. Compound 3 shows a different topology of a 4,4-connected binodal net (4(3)center dot 6(2)center dot 8),, which has the highest crystalline density, highest solvent-accessible void, and accessible special surface area, as well as the highest symmetry among-them. Circular channel, ca. 13 angstrom x angstrom, and two other types of micropore channels are found in six directions. The dye adsorption process for these homologues is proven to be charge-selective and size-selective, in which only the cationic guest (MB+) with a suitable size could enter the frameworks of them and exchange with the dimethylammonium cations. The MB maximum adsorption capacities are 395.1 mg g(-1) for 1, 286.6 mg g(-1) for 2, and 373.2 mg g(-1) for 3, respectively. Moreover, for three kinds of dye mixtures; 3 exhibits the best adsorption kinetics, which is probably due to the suitable pore size, highest solvent-accessible void, and the moderate maximum adsorption capacity of MB.
机译：三个含S的高度多孔金属有机骨架，即[（CH3）（2）NH2）Cd（MIPA）（n）中心点xG（n = 4（1），2（2），1（3）G通过巧妙地改变包括溶剂和温度在内的合成条件，成功地组装了具有高吸附能力和对亚甲基蓝（MB）的高选择性的DMF / DMA和H2O的客体。化合物1-3分别在P2（1）/ c，I2 / a和R3m中结晶。它们的阴离子骨架是{[Cd（MIPA）]（n）}（n-）的同系物和多晶相。化合物1和2证明了相同的3; 6-连接的双斜线网状结构（4（2）中心点6）（4（8）中心点6（4）中心点8（3）），封装了大约2个。 18埃x 18埃六角形通道和其他三种类型的微通道。化合物3显示了4,4连接的Biodal网状结构（4（3）中心点6（2）中心点8）的不同拓扑结构，该结构具有最高的晶体密度，最高的溶剂可及孔隙和可及比表面积，以及其中最高的对称性。圆形通道，约。在六个方向上发现了13埃x埃，以及另外两种类型的微孔通道。事实证明，这些同系物的染料吸附过程具有电荷选择性和大小选择性，其中只有大小合适的阳离子客体（MB +）才能进入它们的骨架并与二甲基铵阳离子交换。 MB的最大吸附容量分别为1、396.6 mg g（-1）和2、286.6 mg g（-1）和33.2 mg g（-1）。而且，用于三种染料混合物; 3表现出最佳的吸附动力学，这可能是由于合适的孔径，最高的溶剂可及性以及中等的MB吸附能力。

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