(HO2C(CH2)3NH3)2(CH3NH3)Pb2I7: a predicted non-centrosymmetrical structure built up from carboxylic acid supramolecular synthons and bilayer perovskite sheets

The association of 1D carboxylic acid supramolecular synthons and bilayer perovskite sheets leads to the formation of a predicted non-centrosymmetrical structure of an organic–inorganic hybrid perovskite (HO2C(CH2)3NH3)2(CH3NH3)Pb2I7.