Zeolitic metal azolate frameworks (MAFs) from ZnO/Zn(OH)2 and monoalkyl-substituted imidazoles and 1,2,4-triazoles: Efficient syntheses and properties
- 作者：Ai-Xin Zhu ; Rui-Biao Lin ; Xiao-Lin Qi ; Yan Liu ; Yan-Yong Lin ; Jie-Peng Zhang ; zhangjp7@mail.sysu.edu.cn ; Xiao-Ming Chen ; cxm@mail.sysu.edu.cn
- 关键词：Porous coordination polymers ; Metal azolate frameworks ; Imidazolate ; Triazolate ; Flexibility
- 刊名：Microporous and Mesoporous Materials
- 出版年：2012
- 期刊代码：78_13871811
- 类别：ch
- 出版时间：15 July, 2012
- 卷：157
- 期：Complete
- 页码：42-49
- 文件大小：1157 K
摘要
Acid-base neutralization reaction between monoalkyl-substituted azole derivatives and ZnO/Zn(OH)2 can be effectively activated by aqueous ammonia to synthesize a series of metal azolate frameworks (MAFs) including SOD-[Zn(mim)2] (MAF-4, Hmim = 2-methylimidazole), ANA-[Zn(eim)2] (MAF-5, Heim = 2-ethylimidazole), SOD-[Zn(mtz)2] (MAF-7, Hmtz = 3-methyl-1,2,4-triazole), dia-[Zn(mim)2] (MAF-31), qtz-[Zn(eim)2] (MAF-32), and dia-[Zn(etz)2] (MAF-33, Hetz = 3-ethyl-1,2,4-triazole). The porous zeolitic MAFs obtained by this reaction possess high stability and can be easily activated. Their high porosity, unique pore size/surface characteristic, and framework flexibility were demonstrated by gas and solvent vapor (water, methanol, and benzene) sorption measurements. The imidazolate frameworks MAF-4 and MAF-5 are highly hydrophobic adsorbents with exceptional organic/water selectivity, while the triazolate framework MAF-7 containing uncoordinated nitrogen donor on the pore surface exhibits higher sorption affinity and lower stability. Despite the very small aperture sizes (3.2-3.4 脜), the SOD frameworks can readily adsorb large organic molecules by temporary distortion of the structure.