Mn(II)-Based Porous Metal鈥揙rganic Framework Showing Metamagnetic Properties and High Hydrogen Adsorption at Low Pressure

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• 作者：Zheng-Bo Han ; Rui-Yun Lu ; Yan-Fang Liang ; Yan-Ling Zhou ; Qing Chen ; Ming-Hua Zeng
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：January 2, 2012
• 年：2012
• 卷：51
• 期：1
• 页码：674-679
• 全文大小：381K
• 年卷期：v.51,no.1(January 2, 2012)
• ISSN：1520-510X

文摘

A Mn(II)-based homometallic porous metal鈥搊rganic framework, Mn₅(btac)₄(渭₃-OH)₂(EtOH)₂路DMF路3EtOH路3H₂O (1, btac = benzotriazole-5-carboxylate), has been solvothermally synthesized and structurally characterized by elemental analysis, thermogravimetric analysis, and X-ray crystallographic study. 1 is a 3D neutral framework featuring 1D porous channels constructed by {Mn鈥揙H鈥揗n}_n chains and btac linkers. Magnetic studies show that 1 is a 3D metamagnet containing 1D {Mn鈥揙H鈥揗n}_n ferrimagnetic chains. High-pressure H₂ adsorption measurement at 77 K reveals that activated 1 can absorb 0.99 wt % H₂ at 0.5 atm and reaches a maximum of 1.03 wt % at 5.5 atm. The steep H₂ absorption at lower pressure (98.2% of the storage capacity at 0.5 atm) is higher than the corresponding values of some MOFs (MIL-100 (16.1%), MOF-177 (57.1%), and MOF-5 (22.2%)). Furthermore, activated 1 can adsorb CO₂ at room temperature and 275 K. The adsorption enthalpy is 22.0 kJ mol^鈥?, which reveals the high binding ability for CO₂. Detailed gas sorption implies that the exposed Mn(II) coordination sites in the activated 1 play an important role to improve its adsorption capacities.