Crystal structure of trans-(1,8-dibutyl-1,3,6,8,10,13-hexa­aza­cyclo­tetra­decane-κ4 N 3,N 6,N 10,N 13)bis­(thio­cyanato-κN)nickel(II) from synchrotron data

The crystal structure of the title compound, [Ni(NCS)2(C16H38N6)], has been determined from synchrotron data. The asymmetric unit consists of two halves of the complex mol-ecules which have their Ni(II) atoms located on inversion centres. The Ni(II) ions show a tetra-gonally distorted octa-hedral coordination geometry, with four secondary amine N atoms of the aza-macrocyclic ligand in the equatorial plane and two N atoms of the thio-cyanate anions in the axial positions. The average equatorial Ni-N bond length [2.070 (5) Å] is shorter than the average axial Ni-N bond length [2.107 (18) Å]. Only half of the macrocyclic ligand N-H groups are involved in hydrogen bonding. The complex mol-ecules are connected via inter-molecular N-H⋯S hydrogen bonds into two symmetry-independent one-dimensional polymeric structures extending along the b-axis direction. One of the n-butyl substituents of the macrocycle exhibits conformational disorder with a refined occupancy ratio of 0.630:0.370.