Effect of nuclearity and reduction state of the central ligand on magnetic properties of hexaazatrinaphthylene-based cobalt(II) and iron(II) complexes: From extremely weak to record-breaking antiferromagnetic exchange interaction.

A series of HATNA and HATA complexes with high-spin cobalt( ii ) and iron( ii ) ions with different nuclearity and reduction states of the central ligand have been synthesized. Their numerous magneto-structural correlations have been discussed.