stability of the samples has been checked by differential scanning calorimetry (DSC) in the temperature range -80-130°C showing no evidence of any phase transitions (see Figure ). As can be appreciated from Table , the two chiral samples of (R-ClMBA)3GeI5 and (S-ClMBA)3GeI5 crystallize in the non-centrosymmetric P21 space group (n° 4), one of the 65 Sohncke space groups, and form two inverted crystal structures. The crystal structure is composed of GeI6 octahedra arranged in linear zig-zag chains running along the b-axis (cfr. ethyl-quinuclidine (EQ) in a lead iodide perovskite (EQPbI3). Finally, the only other lead-free 1D perovskite, namely [(R/S)-β-MPA]4AgBiI8 (MPA= methylphenethylammonium), has been reported in 2021 by Liu and co-workers. Another interesting feature of the present Ge-based chiral perovskite is related to the octahedral distortion parameters which can be quantified in terms of bond length distortion index (D) and bond angle variance (σ 2 ). The larger the value of D and σ 2 , the larger becomes the octahedral distortion. The D parameter for (R-ClMBA)3GeI5 and (S-ClMBA)3GeI5 is in the range 0.071-0.075 with bond angle variance in the range 12.59-15.70 deg 2 , respectively. Such distortion level surpasses the actual highest value of octahedral distortion in chiral perovskites which has been previously reported for (R-/S-MBA)2SnI4 having a similar D parameter and σ 2 of about 10.3 deg 2 . We can correlate this high level of distortion to the presence of Ge cation. As a matter of fact, we already observed an increased level of octahedral deformation by moving from Pb to Sn and to Ge in related low-dimensional perovskites. To sum up, the (R-ClMBA)3GeI5 and (S-ClMBA)3GeI5 1D chiral perovskites represent not only the first examples of Ge-containing materials but the structural investigation allowed to highlight an unusual and uncommon octahedra connection network leading also to the highest level of octahedral distortion reported so far in chiral perovskites.