Acta Crystallographica Section C

Crystal Structure Communications

Volume 64, Part 6 (June 2008)

metal-organic compounds

 

Magnetism and crystal structure of an N₃O₃-coordinated iron(II) complex

W. Bauer and B. Weber

Abstract: The reaction of [FeL(MeOH)₂] {where L is the tetradentate N₂O₂-coordinating Schiff base-like ligand (E,E)-diethyl 2,2'-[1,2-phenylenebis(nitrilomethylidyne)]bis(3-oxobutanoate)(2-) and MeOH is methanol} with 3-aminopyridine (3-apy) in methanol results in the formation of the octahedral complex (3-aminopyridine-N¹){(E,E)-diethyl 2,2'-[1,2-phenylenebis(nitrilomethylidyne)]bis(3-oxobutanoato)(2-)-⁴O³,N,N',O^3'}(methanol-O)iron(II), [Fe(C₂₀H₂₂N₂O₆)(C₅H₆N₂)(CH₄O)] or [FeL(3-apy)(MeOH)], in which the Fe^II ion is centered in an N₃O₃ coordination environment with two different axial ligands. This is the first example of an octahedral complex of this multidentate ligand type with two different axial ligands, and the title compound can be considered as a precursor for a new class of complexes with potential spin-crossover behavior. An infinite two-dimensional hydrogen-bond network is formed, involving the amine NH group, the methanol OH group and the carbonyl O atoms of the equatorial ligand. T-dependent susceptibility measurements revealed that the complex remains in the high-spin state over the entire temperature range investigated.

Formula: [Fe(C₂₀H₂₂N₂O₆)(C₅H₆N₂)(CH₄O)]

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