Crystals of [Fe(phen)3](ClO4)2.0-5H2O (phen = 1,10-phenanthroline) are
nearly isostructural with those of the Co(II) and Cu(II) analogues, w
ith similar disorder of the perchlorate groups. The Fe(II) complex ion
is less distorted than the Co(II) and Cu(II) complex ions. The averag
e Fe-N distance is 1.978 (3) angstrom and the average N-Fe-N bidentate
angle is 82.6 (4)-degrees. The phenanthroline ligands are planar.