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The metal ion complexing properties of 1,10-phenanthroline-2,9-dicarboxylic acid (PDA), with cobalt(II) and nickel(II) are reported. These were determined by UV–Vis spectroscopy in 0.1M NaClO 4 at 25°C and the logK values are 12.6±0.05 and 13.6±0.05 respectively. These two values are compared to that of the previously reported value of copper(II), as well as the previously reported values...