名称:
Mononuclear iron(III)macrocyclic complexes derived from 4-methyl-2,6-di(formyl/benzoyl)phenol and diamines: synthesis, spectral speciation and electrochemical behaviour
摘要:
Two series of macrocyclic iron(III) complexes of stoichiometry [Fe(L)Cl-2]Cl (1, 2) have been synthesised and characterised. Compounds belonging to series 1 are derived from 4-methyl-2,6-diformylphenol and diamines (H2L), and those of 2 from 4-methyl-2,6-dibenzoylphenol and diamines. All the brown complexes have been characterised by physicochemical techniques. The mass, infrared, electronic, ESR and Mossbauer spectroscopies, magnetic susceptibility data, molar conductance, X-ray diffraction and cyclic voltammetric studies provide unambiguous evidence that 1 and 2 are high-spin iron(III) complexes in which the metal has an octahedral geometry. The Mossbauer data are consistent with high-spin iron(III) and substantial covalency in the Fe(III)-ligand bonds. Cyclic voltammetric studies in DMSO of the mononuclear iron(III) complexes show that they undergo quasi-reversible reduction with E-1/2 approximately -0.74 V versus SCE. (C) 2001 Elsevier Science Ltd. All rights reserved.