Single crystal X-ray diffraction data were collected using Oxford Diffraction SuperNova equipped with Altas CCD detector for compound 1 and Rigaku XtaLAB Synergy-S equipped with HyPix detector for compound 2. In both cases MoKα radiation was used (PhotonJet microsources). Selected details of these measurements are presented in Table . Single crystals were transferred directly from the pentane solutions into the cryoprotectant oil and mounted on the goniometers using MiTeGen® cryomounts. The measurements were performed twice for both compounds: at first at low temperature (full data collection, Table ) and then near the room temperature (fast data collection to avoid crystal decomposition in order to obtain structural model for comparison with the experimental PXRD patterns). ScXRD data were processed using CrysAlisPro 1.171.40.67a. The structures were solved using direct methods (intrinsic phasing using SHELXT ) and refined anisotropically using SHELX (weighted full-matrix least-squares on F 2 ). Hydrogen atoms were placed in the calculated positions and refined as riding on the parent atoms. Mercury 2020.2.0 software (CCDC) was used to visualize the scXRD structural models and prepare the structural diagrams presented in the paper. CCDC 2175717 (1) and CCDC 2175718 (2), contain the supplementary crystallographic data for this paper which can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.