Binary and ternary complexes involved in the systems pyridoxamine (PM), glutamic acid (Glu), or aspartic
acid (Asp) plus Ni(II) or Cu(II) were studied in solution at 0.15 M ionic strength and 25 °C by pH-metric,
absorpiometric, and polarographic techniques. The differential pulse polarographic technique was used
to study the reduction properties of these complexes. EPR was used to confirm the presence of binary
and ternary complex species in the Cu(II) systems. The stoichiometry and formation constants of the
binary and ternary complex species were determined by the SUPERQUAD program. Ternary species of
the types 1:1:1:r and 1:2:1:r (PM/Glu or Asp/M/H) were found to exist in the pH range ∼3 to ∼10.
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