(R/S-ClMBA)3GeI5: A Novel Low-Dimensional Ge-Containing Chiral Perovskite

We report here the first chiral perovskite containing germanium, namely (R/S-ClMBA)3GeI5. Single crystal x-ray diffraction shows the for-mation of a crystal structure composed of GeI6 octahedra arranged in linear zig-zag chains running along the b-axis, providing a one-dimensional (1D) system with a novel structural motif. The presence of Ge leads to the highest values of octahedral distortion parameters among chiral perovskites. Chiroptical properties determination by circular dichroism confirms the effective chirality transfer from the ligands to the in-organic framework with asymmetry factors of the order 10–3, with maximum absorbance around 420 nm. The demonstration of the successful preparation of Ge-based chiral perovskites with clear chiroptical properties may open the way for the future design of novel and optimized materials.