Crystal structure and magneto-structural investigation of alkoxido bridged dinuclear Fe(III) complexes with 1,3-oxazolidine ligands

摘要: Abstract Four 1,3-oxazolidine based ligands (H2L1−H2L4) were synthesized in solvent-free condition from the reaction of amino alcohols (2-amino-2-(hydroxymethyl)-1,3-propanediol or 2-amino-2-ethyl-1,3-propanediol) and 2-acetylpyridine 2-pyridinecarboxaldehyde at 110 °C. new dinuclear Fe(III) complexes, [Fe2(HL1)(N3)4] (1), [Fe2(HL2)(N3)4] (2), [Fe2(HL3)(N3)4] (3) [Fe2(HL4)(N3)4] (4), with a similar procedure by H2L1–4, Fe(NO3)3·9H2O NaN3 1:1:2 molar ratios methanol. The complexes characterized elemental analysis spectroscopic methods. structure was solved single-crystal X-ray diffraction which showed 1–4 to be alkoxido-bridged complexes. structural studies indicated that crystal 2, 3 4 consist centrosymmetric while asymmetric unit 1 consists two halves independent molecules. ions have coordination environments (cis-FeN4O2) all can described as distorted octahedral geometry. act mononegative tridentate N2O-donor ligand 1–4. Two azide groups are also coordinated each ion terminal monodentate ligands. alcoholic arms 1,3-oxazilidine bridging between Fe⋯Fe distances through these bridges range 3.157–3.198 A. Magnetic 2–300 K reveal antiferromagnetic interactions values for magnetic coupling constants −9.4 cm−1 −9.7 cm−1, H = −2J(S1S2).