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The redetermination of the structure of the title compound, [Fe(C 15 H 12 N 4 ) 2 ](ClO 4 ) 2 , (I), confirms the structure previously reported [Kucharski et al. (1978 a ▸). Aust. J. Chem . 31 , 53-56], but models the perchlorate over four sets of atomic sites, rather than using just one set of sites as in the original report. The supra-molecular assembly, not reported previously, takes the form of a complex three-dimensional framework built from C-H⋯O hydrogen bonds. The isotypic nickel(II) analogue, [Ni(C 15 H 12 N 4 ) 2 ](ClO 4 ) 2 , (III), has been refined using the original data set [Wang et al. (2011 ▸). Acta Cryst. E 67 , m 78], again using a four-component disorder model for the anion, rather than a two-component model as in the original report, leading to more satisfactory Cl-O distances and O-Cl-O angles.

acta crystallographica. section e, crystallographic communications

Redetermination of the crystal structure of bis(tri-2-pyridylamine)iron(II) bis(perchlorate), and a new refinement of the isotypic nickel(II) analogue: treatment of the perchlorate anion disorder