DETERMINATION OF POLYLIGAND COMPLEXES OF COBALT (II) WITH CITRATE AND PYROPHOSPHATE IONS

In the work it is shown by spectrophotometry method that depending on concentration ratio of ligands [PPi4–]/[Cit3–] in pyrophosphate-citrate electrolyte, cobalt (II) ions form not only citrate [Co(Cit)2]4– and pyrophosphate [Co(PPi)2]6–, but also polyligand complexes [Co(PPi)m(Cit)n]+2–(4m+3n). The composition [Co(PPi)Cit]5– was determined, equilibrium constant reaction their formation stability were calculated (pβ=8.47). dependence degree citrate, polyligand, electrolyte logarithm concentrations calculated.