The equilibrium constants for mixed binuclear complex formation between certain metal-EDTA complexes andhexacyano!errate(ll), ligand, M(II)-EDTA 2- + Fe(CN):- J' [(EDTA) MII-NC-FeII(CN) in aqueous solution have obtained by spectrophotometric measurements. The results are interpreted to obtain the reactivity order of chelating agents and the electron-pair donating ability of cyanometallate. The relative magnitudes of equilibriuin constants are also dis­cussed.


R S MURRAY ,W C E HIGGINSON ,A H KHAN ,