1-R and 1-S complexes possess crystal structures in the tetragonal enantiomorphic space group pair P43212 and P41212, respectively. The asymmetric unit includes only half of the molecule of complex due to the presence of the 2-fold rotational axis passing through the two Au atoms (Figure ). Notably, even though both Au atoms are bound with the NHC ligands of the same structure, in the crystal, these ligands are not equivalent due to the different orientations of the phenyl substituents at the NHC chiral centers: some are oriented vertically (Ph a , indicated in red, Figure ), while others are positioned horizontally (Ph b , indicated in blue). At the same time, the para-phenylene bridging ligand (PP) is almost coplanar only with one of the NHC ligands, while is perpendicular to the other NHC ligands. The presence of inequivalent NHC ligands in the crystal structure results in the emergence of low symmetry C2 chiral conformation, a simplified view of which is depicted in Figure . Besides the different orientations of phenyl substituents at the NHC ligands (Ph a and Ph b ), these inequivalent phenyl moieties also possess different crystal packing environments (Figures and). Notably, the Ph a moieties experience less dense crystal packing than Ph b , also displaying significantly larger thermal ellipsoids (estimated by average equivalent isotropic displacement parameters for phenyl C atoms -Ueq(Ph), Å 2 ×10 3 : Ph a -190/233 vs Ph b -108/142 for 1-R/1-S at 293K). The difference in the thermal ellipsoids of Ph a and Ph b suggests they may experience two different kinds of thermal motion. At the same time, the PP moiety displays an even tighter crystal packing with a larger number of short contacts with neighboring groups than Ph a and Ph b (Figure ). At the supramolecular level, molecules of 1-R/1-S are forming helical "shaft" packing (M-helix for 1-R, Phelix for 1-S, Figure ), with layered terminal Ph a and Ph b moieties pointing inwards (Figure ). Such organization of terminal phenyl groups in the crystal in the presence of their rotational motion may result in the emergence of the correlated motion. Variable temperature SCXRD measurements indicated no significant crystal structure changes with temperature elevation (Figure ), resulting in only an approximate 2% volume and density change during the thermal expansion in the 213-333K range (Table ). These results align with the DSC data, which showed no noticeable exothermic or endothermic peaks during the heating/cooling cycle in the range of 213-333 K (Figure ). This indicates that the crystals of the complex of 1-R and 1-S do not undergo thermally induced phase transitions in the studied temperature range.