Reversible solid-state thermochromism of a 2D organic–inorganic hybrid perovskite structure based on iodoplumbate and 2-aminomethyl-pyridine

Abstract

An organic–inorganic hybrid molecule [(PyCH₂NH₃)₆][Pb₅I₂₂]·3H₂O (1) with a 2D inorganic layer was produced by reaction of 2-aminomethyl-pyridine with PbI₂ in a concentrated HI aqueous solution. Compound 1 exhibited solid thermochromism showing a reversible color change from orange at room temperature to red at 80 °C, which was caused by the structural changes.