The role and nature of the weak intermolecular bond in the H2O2–noble gas enantiomeric conformations are presented. Charge transfer associated with the formation of a weak intermolecular hydrogen bond tends to stabilize the cis-barrier conformation.
The asymmetric unit of the title compound, [Fe(C15H10N3O)2]ClO4·H2O, contains one iron(III) cation chelated by two N-(8-naphthyl)-2-pyridine-2-carboxamidate ligands via six N atoms, exhibiting an octahedral coordination geometry, a perchlorate anion and a water molecule. The Fe—N bond lengths are in the range 1.880 (3)–1.972 (3) Å. Each ligand is planar (r.m.s. deviations = 0.0314 and 0.0282 Å). The dihedral angle between the two ligand planes is 86.55 (1)°. There is a weak intermolecular hydrogen bond between the water and the perchlorate groups.
