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首页> 外文期刊>Chemistry: A European journal >Water-Mediated Proton Conduction in a Robust Triazolyl Phosphonate Metal-Organic Framework with Hydrophilic Nanochannels
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Water-Mediated Proton Conduction in a Robust Triazolyl Phosphonate Metal-Organic Framework with Hydrophilic Nanochannels

机译：具有亲水性纳米通道的稳固三唑基膦酸酯金属有机骨架中的水介导质子传导

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摘要

The development of water-mediated protonconducting materials operating above 100℃ remains challenging because the extended structures of existing materials usually deteriorate at high temperatures. A new triazolyl phosphonate metal-organic framework (MOF) [La_3L_4(H_2O)_6]Cl?xH_2O (1, L~(2-)=4-(4H-1,2,4-triazol-4-yl)phenyl phosphonate) with highly hydrophilic 1D channels was synthesized hydrothermally. Compound 1 is an example of a phosphonate MOF with large regular pores with 1.9 nm in diameter. It forms a water-stable, porous structure that can be reversibly hydrated and dehydrated. The proton-conducting properties of 1 were investigated by impedance spectroscopy. Magic-angle spinning (MAS) and pulse field gradient (PFG) NMR spectroscopies confirm the dynamic nature of the incorporated water molecules. The diffusivities, determined by PFG NMR and IR microscopy, were found to be close to that of liquid water. This porous framework accomplishes the challenges of water stability and proton conduction even at 110℃. The conductivity in 1 is proposed to occur by the vehicle mechanism.
机译：在100℃以上工作的水介导质子传导材料的开发仍然具有挑战性，因为现有材料的扩展结构通常会在高温下劣化。一种新的三唑基膦酸酯金属有机骨架（MOF）[La_3L_4（H_2O）_6] Cl2xH_2O（1，L〜（2-）= 4-（4H-1,2,4-三唑-4-基）苯基膦酸酯）具有高亲水性的1D通道是通过水热合成的。化合物1是具有大规则孔且直径为1.9 nm的膦酸酯MOF的示例。它形成了水稳定的多孔结构，可以可逆地水合和脱水。通过阻抗谱研究了1的质子传导性质。魔角旋转（MAS）和脉冲场梯度（PFG）NMR光谱证实了掺入水分子的动态性质。发现通过PFG NMR和IR显微镜确定的扩散率接近液态水。这种多孔的骨架即使在110℃也能完成水稳定性和质子传导的挑战。建议1中的导电性由车辆机构产生。

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