ИСТИНА

Non-covalent interactions play a crucial role in supramolecular chemistry, crystal engineering, and the self-assembly of functional materials. This study focuses on the synthesis and structural characterization of new rhenium and technetium compounds, revealing the contribution of weak intermolecular forces— hydrogen bonding, π–π stacking, and novel anion···anion contacts—to crystal packing and thermal behavior. A total of 25 new compounds, including Tc(V) alkoxy complexes and Re(VII)/Tc(VII) salts with organic cations (guaninium, histidinium, and various azoles), were synthesized and characterized using single-crystal X-ray diffraction, thermal analysis, and Hirshfeld surface analysis. The obtained data demonstrate that the geometry of organic cations, protonation degree, and substituent length significantly affect the hierarchy of non-covalent interactions.