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