Structures of a Complex Hydrazinium Lead Iodide, (N H ) Pb I , Possessing [Pb I ] , [PbI ] , and I Ions and α- and β-(N H )PbI.

Photovoltaic perovskites, most notably methylammonium lead triiodide, (NH Me)PbI , have recently attracted considerable attention, and based upon the modified "Goldschmidt" as well as a "revised" tolerance factors, hydrazinium should be able to occupy the same cation site as methylammonium, and form a cubic unit cell. The reaction of N H I with PbI in dimethylformamide results in three types of yellow crystals; hexagonal, needle-like, and rod-like, the structures of which were determined at 100 K. The hexagonal (P6 /m: a=10.