Hybrid organic inorganic perovskites (HOIPs) are continually attracting more attention due to the huge potential in fields like solar cells, light emitting diodes and photodetectors, thanks to the remarkable absorption and luminescence properties along with adjustable band energy structures [1,2]. In this respect, the insertion of chiral organic cations capable of transferring the chiroptical properties to the generated materials allows for the attainment of HOIPs merging the benefits of chiral molecules, as the second-order non-linear optical responses granted by the intrinsic noncentrosymmetry [3], and the good optical features typical of perovskites, allowing for the development of novel and efficient materials featuring high spin selectivity, elevated circular dichroism, enhanced stability, etc. Although the HOIPs fine chemical and structural tuning offers a fruitful playground in terms of material design, several fundamental issues regarding the impact of chemical composition and structural parameters on the photophysical properties and chirality transfer mechanism are still unclear, and their comprehension is an essential step for breakthrough advances in the field.

With this purpose in mind, we are focusing on the design, synthesis and characterization, from both the structural and photophysical viewpoint, of novel and rational series of chiral HOIPs, carefully modifying the components to examine their impact on the final structure thus on the chiroptical properties. Employing (S)-3-aminopiperidine as the chiral cation, we have successfully obtained the bromide and iodide series with Ge^II, Sn^II and Pb^II [4,5], and are performing the functional characterization aiming to correlate the results with the effect of increasing the spin-orbit coupling (SOC) on the central metal. On the other hand, we are texting other organic amines, either commercially available or ad-hoc synthesized, to evaluate how molecular structure, steric hindrance and electronic features impact on the hydrogen bond network and octahedra disposition affecting crystal structure and photophysical properties. By taking advantage of theoretical calculation for an in-depth interpretation of the results, we aim to correlate the photophysical response of chiral HOIPs to the structural features, providing new parameters useful for the design of novel materials for photodetection, chiral photonics, spintronics, energy harvesting, etc.