Lanthanide-Hypophosphite Frameworks with Guanidinium Guest Showing High Proton Conductivity

Main observation and conclusion 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(H2PO2)(7)] (AH = protonated amines). Due to the rich hydrogen bond networks, complex 1 with guanidinium as guest shows high proton conductivity of 1.75 x 10(-2) S center dot 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 Gd3+ ions.