Gas Adsorption and Fluorescent Sensing Properties of Two Porous Lanthanide Metal-Organic Frameworks Based on 3,5-Bis(2-carboxy-phenoxy)-Benzoic Acid

摘要： Two porous isomorphic 3D Eu(Ⅲ)/Nd(Ⅲ) lanthanide metal?organic frameworks (Ln-MOFs), formulated as {[Eu(BCPB)(H2O)(DMF)]·H2O·1.5CH3OH}n (1) and {[Nd(BCPB)(H2O)(DMF)]·2H2O}n (2), have been designed and synthesized by using the tripodal ligand of 3,5-bis(2-carboxy-phenoxy)-benzoic acid (H3BCPB) under solvothermal condition. Complexes 1 and 2 display 3D (3,6)-c net with the point symbol of {4.62}2{42.610.83}. Furthermore, fluorescent measurements showed 1 has highly selective detection for Fe3+ and CrO4 2- ions in aqueous solution, which shows that it acts as a chemical sensor for detecting Fe3+/CrO4 2- in aqueous solution. Meanwhile, gas adsorption properties of 1 and 2 have also been studied at different temperatures for N2, CH4 and CO2.