Crystal structure of trans-(1,8-di­butyl-1,3,6,8,10,13-hexa­aza­cyclo­tetra­decane-κ4N3,N6,N10,N13)bis­­(isonicotinato-κO)nickel(II) determined from synchrotron data

The title compound, [Ni(C6H4NO2)2(C16H38N6)], was prepared through self-assembly of a nickel(II) aza­macrocyclic complex with isonicotinic acid. The NiII atom is located on an inversion center and exhibits a distorted octa­hedral N4O2 coordination environment, with the four secondary N atoms of the aza­macrocyclic ligand in the equatorial plane [average Ni—Neq = 2.064 (11) Å] and two O atoms of monodentate isonicotinate anions in axial positions [Ni—Oax = 2.137 (1) Å]. Intra­molecular N—H⋯O hydrogen bonds between one of the secondary amine N atoms of the aza­macrocyclic ligand and the non-coordinating carboxyl­ate O atom of the anion stabilize the mol­ecular structure. Inter­molecular N—H⋯N hydrogen bonds, as well as π–π inter­actions between neighbouring pyridine rings, give rise to the formations of supra­molecular ribbons extending parallel to [001].