1D hybrid lead bromide perovskitoid with five-coordinated [PbBr5]3- square pyramids for sensitive X-ray detection

Novel 1D lead bromide perovskitoid with [PbBr 5 ] 3− square pyramids. • Cyclic amine cation enables stable 1D corner-sharing inorganic chains. • Five-coordinated geometry separates electron and hole transport pathways. • Electrostatic-sprayed detector exhibits high sensitivity and low detection limit. Low-dimensional hybrid organic-inorganic perovskitoids have demonstrated substantial potential for direct X-ray detection owing to exceptional X-ray attenuation, high activation energy for ion migration and good environmental stability. However, the influence of organic cations, especially the nitrogen heterocycle-based organic cations, on lead bromide perovskitoid properties remains insufficiently explored. Herein, we synthesized a one-dimensional lead bromide perovskitoid, (1,2-Pmpz)PbBr 4 , employing 2-(1-piperazinyl) pyrimidine as the organic cation. (1,2-Pmpz)PbBr 4 exhibits a novel perovskitoid structure in the triclinic