The consideration of the disposition of minima of electron density and electrostatic potential along the line between non-covalently bound atoms in systems with Hal⁻···CH₃–Y (Hal⁻ = Cl, Br; Y = N, O) fragments allowed to prove that the carbon atom in methyl group serves as an electrophilic site provider. These interactions between halide anion and carbon in methyl group can be categorized as the typical tetrel bonds. Statistics of geometrical parameters for such tetrel bonds in CSD is analyzed. It is established that the binding energy in molecular complexes with tetrel bonds correlate with the potential acting on an electron in molecule (PAEM). The PAEM barriers for tetrel bonds show a similar behavior for both sets of complexes with Br⁻ and Cl⁻ electron donors.

Simulation results obtained for isostructural dihalogenide, hexahalogenbenzene, and halogenotrinitromethane crystals under external hydrostatic compression are analyzed. Along with macroscopic mechanical properties such as anisotropy of uniaxial and hydrostatic compressibility of crystals and orientation of the axes of maximal and minimal uniaxial and hydrostatic compressibility, we consider also microscopic properties such as electronic characteristics of halogen bonds and non-covalent interactions which are estimated using quantum electron pressure and its scalar indicator. It is established that halogen bonds are more sensitive to external compression than typical Van der Waals interactions of halogens.