New nickel mixed-ligand complex containing 2-aminopyrimidine and 5-bromosalicylaldehyde with a one-dimensional hydrogen bonded structure

The compound [Ni(PymNH2)2(5-BrSal–H)2]n·2dmf (PymNH2 = 2-aminopyrimidine, 5-BrSal = 5-bromosalicylaldehyde, dmf = dimethylformamide) has been synthesized and characterized by elemental analysis, X-ray crystallography and infrared spectroscopy. Mutual trans arrangement of the 2 + 2 organic ligands that octahedrally coordinate one nickel centre enables intramolecular H-bonds to further stabilize the neutral molecule and vice versa. In the crystal lattice, each PymNH2 ring forms a dimer with its inversion-related counterpart via a hydrogen atom of the amino group and the non-coordinated ring nitrogen. The packing motif of the self-complementary hydrogen bonded PymNH2 dimers, which form chains of the complex molecules, is the structure-determining factor in the present study. Dmf molecules of crystallization are accommodated on both sides of the dimers.