Structural Characterization and Proton-conductive Property of a Lanthanide Metal-organic Framework Assembled from 1,2,4,5-Benzenetetracarboxylic Acid and Piperazine

摘要

The reaction of Pr(Ⅲ) salt with 1,2,4,5-benzenetetracarboxylic acid (H4betc) and piperazine (pip) yielded a lanthanide metal-organic framework {[Pr(betc)(H2O)2](H2pip)0.5}n (1) under hydrothermal conditions.Compound 1 was characterized by single-crystal X-ray structural analysis,elemental analysis,IR,X-ray powder diffraction,and thermal gravimetric.Compound 1 crystallizes in monoclinic,space group P21 with a =11.023(5),b =11.109(5),c =11.456(5) A,β=110.065(5)°,V=1317.7(9) A3,Mr =471.14,Z =4,F(000) =920,Dc =2.375 g/cm3,μ(MoKα) =3.761 mm-1,the final R =0.0286 and wR =0.0821 (I＞ 2σ(I)).Compound 1 exhibits a 2D network with (4,4) topology,and a 3D supramolecular framework formed by hydrogen-bonding interactions.The proton conductivity of compound 1 has been investigated at ～97％ relative humidity and different temperature.