1D hydrogen-bonded infinite chains from tetraaza macrocycle nickel(II) complexes and ligands

Crystal structure of 3,14-diethyl-2,13-diaza-6,17-diazoniatricyclo[16.4.0.07,12]docosane dinitrate dihydrate from synchrotron X-ray data

“…These di-or tetra-ammonium cations may be suitable for the removal of toxic heavy metal ions from water. The crystal structures of [Cu(L)](ClO 4 ) 2 (Lim et al, 2006), [Cu(L)](NO 3 ) 2 , [Cu(L)(H 2 O) 2 ](SCN) 2 (Choi et al, 2012), [Ni(L) (Lim et al, 2015) and [Ni(L)(NCS) 2 ] (Lim & Choi, 2017) have been reported. In these complexes, Cu II or Ni II cations have tetragonally distorted octahedral environments with the four N atoms of the macrocyclic ligand in equatorial positions and the O/N atoms of anions or water molecules in the axial positions, while [Ni(L)](ClO 4 ) 2 Á2H 2 O (Subhan & Choi, 2014) has a square-planar geometry around the Ni II atom that binds to the four nitrogen atoms of the macrocyclic ligand.…”