Features of Noncovalent Interactions in the Structures of New Uranyl Methacrylates R[UO2(C4H5O2)3], Where R = (CH_3)₂NH₂⁺ or (C₂H_5)₂NH₂⁺

The crystals of R[UO2(mac)3]2 (where R is (CH3)2 NH₂⁺ (I) or (C2H5)2 NH₂⁺ (II), and mac is methacrylate ion C_4H_5O_2⁻ ) are synthesized and studied by IR spectroscopy and X-ray diffraction (XRD) (CIF files CCDC nos. 2476810 (I) and 2476811 (II)). The [UO2(mac)3]– complexes have the crystallochemical formula А(B01)3, where A is UO₂^2 + , and B01 is mac. A comparative analysis of noncovalent interactions in the crystal structures of compounds I and II is carried out using the Voronoi–Dirichlet molecular polyhedra (VDMP) and Hirshfeld surface methods. The results of these independent methods are well consistent for both qualitative and quantitative estimations of intermolecular contacts. Only the VDMP method allows one to characterize in detail any interatomic contacts that contribute to the real range of intermolecular interactions.