Heteroligand Cu(II) Complexes with 2-Halogenopyridines: Crystal Structure and Features of Halogen⋯Halogen Contacts in the Solid State

By the reaction of a CuCl22H2O solution in ethanol with a 2-bromopyridine (2-BrPy) solution in ethanol heteroligand complex [Cu(2-BrPy)2(H2O)Cl2] (1) is obtained and its structure is determined by single crystal XRD. The energies of non-covalent halogen⋯halogen interactions in the crystal structures of 1 and previously obtained [Cu(2-ClPy)2(H2O)Cl2] (2) are estimated by quantum chemical calculations within the density functional theory at the M06/DZP-DKH level and the QTAIM topological analysis of the electron density distribution.