The synthesis and characterisation of diacidobis(ethylenediamine)ruthenium(III) complexes and related compounds

Abstract

New ruthenium(III) complexes of the type [RuX₂en₂] A(en = ethylenediamine, X₂= C₂O₄, Cl H₂O, Cl l, Cl₂, Br₂, or l₂; A = Cl, Br, l, ClO₄, or p-Me·C₆H₄·SO₂·O) have been isolated, together with complexes of the related ligands triethylenetramine and optically active propylenediamine. Magnetic susceptibilities show that all the compounds have the spin-paired d₅ configuration. The cation [RuCl₂en₂]⁺ has been resolved into its optical enantiomorphs, and its structure related to that of other bis(ethylenediamine)ruthenium(III) compounds, all of which are assigned a cis configuration. Ultraviolet, visible, and infrared spectra are reported, and the use of infrared spectra in the detection of geometrical isomerism is discussed. New mono-ethylenediamine complexes [RuX₄en]^– have been isolated in combination with the cations [RuX₂en₂]⁺ and (phen H)⁺(phen = 1,10-phenanthroline; X = Cl, Br, l, or ½C₂O₄).