LAUSR

Improving stability and photoelectric properties are current aims in the field of inorganic-organic hybrid lead halides. In this work, a new covalently bonded pillared layered bromoplumbate, [Pb3Br6(CV)]n, was prepared using the photoactive zwitterion viologen N,N'-4,4'-bipyridiniodipropionate (CV) as a ligand. It has a high thermal stability in air, and showed a remarkable increase of capacitance after photoinduced electron transfer (PIET). The observed dielec-tric switch ratio of ~689% at 3 kHz exceeded all reported values at room temperature for switchable dielectric materials. The capacitance gain derived from the redistribution of electrons after PIET from lead halide layer to organic π-aggregates, so that the activation energy of hopping polarizability significantly reduced.