Abstract
A number of low-spin iron(II) complexes of formula [Fe(LL) 3](PF 6) 2 with LL=a substituted 3-(pyridin-2-yl)-1,2,4-triazine ligand have been prepared. NMR spectroscopy has been used to identify the structure of the complexes; in all cases the ligands bind didentately via N1 of the triazine ring and the pyridyl-nitrogen atom. With the asymmetrical pyridyltriazine ligands, two geometrical isomers have been observed, viz. facial ( fac) and meridional ( mer). Electrochemical measurements (CV and DPP) revealed that the triazine ligands have low-lying empty π* levels and as a result all complexes are easily reduced. Comparison with analogous ruthenium complexes, revealed that the oxidation potentials of the iron(II) complexes are about 200 mV lower, while the reduction potentials are very similar.
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