Crystal structure and Hirshfeld surface analysis of (nitrato-κ 2 O , O ′)(1,4,7,10-tetraazacyclododecane-κ 4 N )nickel(II) nitrate

The crystal structure of the title compound, [Ni(C 8 H 20 N 4 )(NO 3 )]NO 3 , at room temperature, has monoclinic ( P 2 1 / n ) symmetry. The structure displays intermolecular hydrogen bonding. The nickel displays a distorted bipyramidal geometry with the symmetric bidentate bonded nitrate occupying an equatorial site. The 1,4,7,10-tetraazacyclododecane (cyclen) backbone has the [4,8] configuration, with three nitrogen-bound H atoms directed above the plane of the nitrogen atoms towards the offset nickel atom with the fourth nitrogen-bound hydrogen directed below from the plane of the nitrogen atoms. The nitrate anion O atoms are seen to hydrogen bond to the H atoms bound to the N atoms of the ligand.