Preparation and characterisation of some new 12- and 14-membered dibenzotetraaza macrocyclic complexes of iron(III)

Abstract

The iron(III) macrocyclic complexes of some 12- and 14-membered dibenzo tetraaza macrocycles have been synthesised by the template process using o-phenylenediamine and the appropriate diketone. This affords a method to prepare these complexes with different ring substituents and varying degrees of unsaturation. All complexes were characterised by elemental analysis, molar conductance, magnetic susceptibility, visible and infrared spectra. They are all high spin and six coordinate. These macrocycles tend to attain a ‘saddle shape’ which favours a cis-geometry. This is supported by the infrared and Mössbauer spectra.