Abstract
The reactions between Fe(Phen) 2+3 [phen = tris-(1,10) phenanthroline] and Co(CN)5X3− (X = Cl, Br or I) have been studied in aqueous acidic solutions at 25 °C and ionic strength in the range I = 0.001–0.02 mol dm−3 (NaCl/HCl). Plots of k2 versus √I, applying Debye–Huckel Theory, gave the values −1.79 ± 0.18, −1.65 ± 0.18 and 1.81 ± 0.10 as the product of charges (ZAZB) for the reactions of Fe(Phen) 2+3 with the chloro-, bromo- and iodo- complexes respectively. ZAZB of ≈ −2 suggests that the charge on these CoIII complexes cannot be −3 but is −1. This suggests the possibility of protonation of these CoIII complexes. Protonation was investigated over the range [H+] = 0.0001 −0.06 mol dm−3 and the protonation constants Ka obtained are 1.22 × 103, 7.31 × 103 and 9.90 × 102 dm6 mol−3 for X = Cl, Br and I, respectively.
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Ojo, J.F., Ige, J., Ogunlusi, G.O. et al. Protonation of Chloro-, Bromo- and Iodo-pentacyanocobaltate(III) Complexes. Transition Met Chem 31, 337–339 (2006). https://doi.org/10.1007/s11243-005-6398-8
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DOI: https://doi.org/10.1007/s11243-005-6398-8