Abstract
Metal-organic frameworks(MOFs)with inherent porosity and suspended acidic groups are promising pro-ton conducting materials in water or aqua-ammonia media.Herein we report a new lanthanide phospho-nate,namely,Dy2(amp2H2)2(mal)(H2O)2-5H2O(MDAF-6).It possesses a 3D open-framework structure,and shows a high NH3 adsorption capacity of 142.4 cm3/g at P/P0=0.98 at 298K due to acid-base in-teraction.Interestingly,the proton conductivity of MDAF-6-NH3 is enhanced by five orders of magnitude compared to MDAF-6 after 8.5 h exposure in saturated NH3-H2O vapor,indicating the importance of coex-istent conjugate acid-base pairs of H3O+-H2O and NH4+-NH3 in promoting proton conduction.Magnetic studies of MDAF-6 revealed slow magnetization relaxation under zero dc field,characteristic of single-molecule magnet behavior.This work provides not only a new multifunctional MOF material,but also a new strategy to improve proton conduction in aqua-ammonia medium.
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