Water-Assisted Proton Conductivity Of Two Lanthanide-Based Supramolecules

By using a multifunctional organic ligand, 2-(3-benzoylthioureido)ethanoic acid (H3L), an N-containing ligand, 1,10-phenanthroline (Phen), and two kinds of lanthanides (Gd(iii) and Ho(iii)), two binuclear supramolecules [Gd-2(eta(2)-H2L)(2)(H2L)(2)(Phen)(2)(NO3)(2)(CH3OH)] (1) and [Ho-2(eta(2)-H2L)(2)(H2L)(2)(Phen)(2)(NO3)(2)(CH3OH)] (2) were prepared. 1 and 2 are isostructural 3D supramolecular frameworks supported by intermolecular H-bonds and pi-pi interactions. Both complexes demonstrate excellent water and thermal stability, which meets the requirements of the proton conductivity study. The highest proton conductivities are 0.87 x 10(-4) and 1.58 x 10(-4) S cm(-1) for 1 and 2 at 98% RH and 100 degrees C, respectively, which can be comparable to those of some reported lanthanide-based MOFs showing great potential as proton conductive materials.