Metal center impact on the high-pressure behaviour of chiral 2D perovskites

The aim of this proposal is the investigation as a function of pressure of the 2D chiral perovskites (R-/S-ClMBA)2SnI4 and (R-/S-ClMBA)2GeI4 (ClMBA= chloromethylbenzylammonium), with the same structural motif of the already HP-PXRD investigated (R-/S-/Rac-ClMBA)2PbI4. Interesting structural and optical features as a function of the central metal have been discovered at ambient pressure, suggesting that evaluating the behaviour at variable pressure would permit further comprehension of the metal role. Moreover, moving away from toxic lead is a current challenge within the field, although only few lead-free chiral perovskites have been reported so far. Our structural experiment will be coupled to the Raman and photoluminescence characterization as a function of pressure, to fully investigate the behaviour of these 2D chiral perovskites upon compression and unveil the evolution of non-linear optical properties with different metal centers.