Formation of polynuclear iron(III) complexes of N-(2-pyridylmethyl) iminodipropanol depending on pseudohalide ions: synthesis, crystal structure, and magnetic properties

초록

Five polynuclear iron(III) complexes, [(pmidp)Fe(NCSe)](2) (1), [(pmidp)Fe(NCBH3)](2 )(2), [(Hpmidp/pmidp) Fe-3(CH3O)(2)(NCS)(4)].H2O (3), [(pmidp)(2)Fe-6(CH3O)(4)(N-3)(4)(CH3COO)(2)O-2] (4), and [(pmidp)(2)Fe-6(CH3O)(4)(NCO)(4)(CH3COO)(2)O-2].2MeOH (5) were isolated through the reactions of N-(2-pyri dylmethyl)iminodipropanol (H(2)pmidp) and iron(III) ions with different pseudohalide ions. The complexes were studied via X-ray crystal diffraction, Mossbauer spectra, and magnetochemistry. The molecular structures of 1 and 2 were formed as the {Fe-2(mu(2)-Opropoxo)(2)}(2+) cores with pmidp(2-) and NCSe-/NCBH3-. The structure of 3 was formed as a {Fe-3(mu(2)-OCH3)(2)(mu(2)-Opropoxo)(4)}(5+) core with Hpmidp-/pmidp(2-) and NCS-. The structures of 4 and 5 were formed as {Fe-6(mu(4)-O)2(mu(2)-OCH3)(2)(eta(2)-OAc)(2)(mu(2)-Opropoxo)(4)} cores with pmidp(2-) and NCO-/N-3-. Structural analyses revealed that the formation of various multinuclear iron(III) moieties depends on the auxiliary ligands. The oxidation states of all the complexes were confirmed as + 3 using the bond valence sum (BVS) calculations and Mossbauer spectral data. The susceptibility data for 1-5 fitted using each spin coupling (J) model indicated that 1-3 showed antiferromagnetic exchange interactions, and 4 and 5 showed the ferromagnetic and antiferromagnetic couplings, simultaneously. (c) 2022 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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