Preparation and characterization of [H3N(CH2)6NH3]PbI4 and similar compounds with a layered perovskite structure

Abstract

The preparation, crystal structure and optical absorption spectra of [H₃N(CH₂)₆NH₃]PbX₄ (X = I, Br, Cl) and similar compounds based on Sn are described. The compounds [H₃N(CH₂)₆NH₃]PbX₄ consist of ordered perovskite sheets of the corresponding-corner sharing PbX₆ octahedra, which alternate with the H₃N(CH₂)₆NH₃ sheets. The excitonic peaks in the optical absorption spectra of these compounds occur at shorter wavelengths than those of the corresponding compounds with the formula [C₆H₅CH₂CH₂NH₃]₂MX₄.