μ-Azido- and μ-Oxo-Complexes of Fe(III) with Schiff Bases

Two new azido-bridged Fe(III) Schiff base complexes, [Fe(salen)N-3] and [Fe(MeO-salen)N-3] . 2H(2)O, [salen=N,N' -bis-salicylaldehyde(ethylenediimine) and MeO-salen=NAl-bis-3-methoxysaficylaldehyde(ethylenediimine)] have been synthesized, characterized and studied cryo-magnetically. A new isomeric form of the complex [{Fe(salen)}201 was obtained when attempts were made to grow single crystal of [Fe(salen)N3] from different solvents. The structure of [Fe(salen)120 has been determined by single crystal X-ray analysis. Magnetic susceptibility measurements show the presence of antiferromagnetic interactions in [Fe(salen)N3] and [Fe(MeO-salen)N-3].2H(2)O. The theoretical fit of the susceptibility data yielded values for the spin exchange parameters J = -10 (+/-0.2) and -13 (+/- 0.3)cm(-1), for [Fe(salen)N-3] and [Fe(MeO-salen)N-3] . 2H(2)O, respectively.