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Complexation equilibrium between iron(III) and N,N' -bis(2-hydroxyphenylmethyl)-N,N' -bis(2-pyridylmethyl)-1,2- ethanediamine (H2bbpen), a colorless hydrophobic divalent hexadentate ligand, and potential use of the ligand for the spec- trophotometric determination of iron(III) in aqueous solution was investigated. In the pH range 2.0 - 3.0, Fe(III) forms stable 1:1 complex with H2bbpen, and Fe(III) can be determined selectively as the purple Fe(bbpen) + complex (λmax = 560 nm, e = 4.3 〈 103 dm3 mol-1 cm-1, log β1 = 32.6 ∠ 0.1). In this system, linear calibration range of Fe(III) was 5 〈 10-6 - 2 〈 10-4 mol dm-3 (0.3 - 12 µg cm-3) and detection limit was 3 〈 10-6 mol dm-3 (0.2 µg cm-3). Furthermore, most of foreign metal cations did not influence largely the determination of Fe(III).

Complexation equilibrium between iron(III) and N,N'-bis(2-hydroxyphenylmethyl)-N,N'-bis(2-pyridylmethyl)-1,2-ethanediamine