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Comparison of selectivity of phosphate anion recognition at pH 7.4 between Ni(II)–Aβ5–9 and a Cu(II)–Aβ5–9 complex described previously.14 ΔEox is the difference in the potential values of Cu(II) or Ni(II) oxidation of the respective ternary system and the binary complex. Concentrations of reagents: 0.5 mM Aβ5–9, 0.45 mM Cu(II) or Ni(II), and 10 mM anions or nucleotides.
