Synthesis, structures, and magnetic properties of carboxylate-bridged trinuclear complexes based on low-spin manganese(III)/iron(III) building blocks

摘要: Four linear trinuclear transition metal complexes have been prepared and characterized. The [MII(MeOH)4][FeIII(L)2]2·2MeOH (M = Fe (1) or Ni (2)), [CoII(EtOH)2(H2O)2][FeIII(L)2]2·2EtOH (3), [MnII(phen)2][MnIII(L)2]2·4MeOH (4) (H2L ((2-carboxyphenyl)azo)-benzaldoxime, phen 1,10-phenanthroline) possesses a similar syn–anti carboxylate-bridged structure. terminal Fe(III) Mn(III) ions are low spin, the central M(II) high spin. Magnetic measurements show that antiferromagnetic interactions were present between adjacent via carboxylate bridges. coupling low-spin Ni(II) is unusual, which has tentatively assigned to structural distortion of Fe(III).