Lanthanide-Hypophosphite Frameworks with Guanidinium Guest Showing High Proton Conductivity

Proton-conductive metal-organic frameworks(MOFs)have attracted great attention for their promising application in membrane fuel cells.To explore proton-conductive MOFs with high performance,here we present four lanthanide-hypophosphite frameworks with distinct amine guests.These complexes possess a general formula[AH][Gd_(2)(H_(2)PO_(2))_(7)(AH=protonated amines)].Due to the rich hydrogen bond networks,complex 1 with guanidinium as guest shows high proton conductivity of 1.75×10^(-2) S·cm^(-1) at a relative humidity of 97%(368 K).We also studied the magnetic properties of complex 1 and reveal that the hypophosphite ligand transfers weak antiferromagnetic interactions between Gd^(3+)ions.