Optical properties of (R/S-MBA)2CuCl4 and (rac/R/S-ClMBA)2CuCl4 have been measured by UV-Vis (on powdered single crystals) and CD spectroscopy (on spincoated polycrystalline thin films of about 300 nm thickness). Details about thin films preparation are reported in the Room temperature steady-state photoluminescence measurements were attempted but not clear emission was observed for all the samples. This is in agreement with previous reports on other copper-based metal halides. The linear absorption spectra of (R/S-MBA)2CuCl4 (see Figure ) are superimposable and show quite sharp edge around 450 nm followed by a broader absorption at higher wavelength: the first can be associated to the ligand-to-metal charge transfer (LMCT) transition while the second to the Cu d-d transitions. The CD spectra have been collected on thin films prepared by spin coating as reported in the Experimental. In all the cases, the diffraction patterns of the films resulted to be significantly oriented along the (00l) direction, as can be seen from Figure displaying, The CD spectra of (R/S-MBA)2CuCl4 films show three mirrored distinct peaks from 310 to 470 nm, with this last well corresponding to the position of the absorption edge (see Figure ), as a result of the Cotton effect. The presence of opposite signs in the CD peaks for the two samples confirms the chirality transfer from the chiral ligand MBA to the inorganic framework. As a matter of fact, the two chiral amines have CD spectra with a peak cantered around 245 nm (see Figure ). On the other hand, the racemic compound does not present any CD signal, as expected. The chiral anisotropy factor, gCD, has been calculated from the CD measurements and resulted to be around 1.13 × 10 -2 for the R sample, and -1.67 × 10 -2 for the S sample, in fairly good agreement with previous data on these samples where, however, the CD spectra appears different and with an absorption close to the UV region of the spectrum, with the highest wavelength peak centred around 378 nm which seems to contradict the optical response and colour of the samples. An analogous result also holds for the (R/S-ClMBA)2CuCl4 films showing, however, a narrow signal around 350 nm and a broader one extending up to c)