Crystal structure and magnetic properties of (tris-{4-[1-(2-meth-oxy-eth-yl)imidazol-2-yl]-3-aza-but-3-enyl}amine)-iron(II) bis-(hexa-fluorido-phosphate).

In the complex cation of the title compound, [Fe(C27 H41 N10 O3 )](PF6 )2 , the tripodal tris-{4-[1-(2-meth-oxy-eth-yl)imidazol-2-yl]-3-aza-but-3-en-yl}amine ligand is coordinated to an FeII ion through the nitro-gen atoms of three imidazole and three imino groups. The Fe atom exhibits a distorted octa-hedral geometry. In the crystal, l and d anti-podes are arranged in layers in the bc plane. Weak C⋯F and C-H⋯F/O contacts exist between the ligands of the complex cation and the PF6 - anions, generating a three-dimensional network. At 120 K, the FeII ion is in a low-spin state, with an average Fe-N bond distance of 1.970 (2) Å. On heating, the FeII ion converts to the high-spin state, as demonstrated by magnetic susceptibility measurements.