Symmetry, and Rotational Dynamics. While the change in CPL intensity with temperature is a reasonably expected result of the thermo-responsive behavior of emissive organogold crystalline molecular rotors such as 1-R and 1-S (due to the general increase of emission intensity), the enhancement in luminescence dissymmetry factor values (glum) with cooling is a more interesting observation. Usually, alterations in the luminescence (or absorption) dissymmetry factors require significant changes and rearrangements in the molecular or supramolecular structure, which are more probable in less ordered and fluid media, such as solutions, dynamic aggregates, and polymer environments. In the case of rigid crystalline media, significant changes in glum usually can be achieved through phase transitions (i.e., single-crystal-to-singlecrystal or single-crystal-to-amorphous) or/and by changing the emission band or mechanism (e.g. from fluorescence to phosphorescence or vice versa). In our previous work, we demonstrated that phenylene rotation in the crystals of chiral triaryltriazine derivates can suppress intersystem crossing (ISC) in the exited state via nonradiative decay pathways. This suppression results in the quenching of phosphorescence and a switch in the emission mode to fluorescence at higher temperatures, leading to dramatic changes in the emission maximum and lifetime. Additionally, the presence of rotational motion induces steric repulsion among neighboring groups, altering the dihedral angle of the chiral binaphthyl moieties. This binaphthyl conformation alteration with temperature significantly impacts CD and CPL responses including also the gabs and glum values. (d) and glum(g) values are represented by an average of three independent measurements, the data is taken from Table .