Abstract
THE cobalt(III) complexes of pentacyano-type, [Co(CN)5 X], including several kinds of the new complex compounds, K3[Co(CN)5Cl], K3[Co(CN)5SCN], K3[Co(CN)5N3].2H2O, K3[Co(CN)5NO2] and K4[Co(CN)5SO3].2H2O, have been studied polarographically. The pentacyano complexes were found to be divisible into two groups from the point of view of their polarographic behaviour. The ions of one group, [Co(CN5Cl]3−, [Co(CN)5Br]3−, [Co(CN)5I]3− and [Co(CN)5SCN]3−, were reduced irreversibly in two steps to cobalt(I) complexes, through the cobalt(II) state at the dropping mercury electrode in potassium halide supporting electrolyte (Table 1). The ratio of the height of the first wave to that of the second is approximately 1 : 1.
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References
Pauling, L., “General Chemistry”, 277 (1948).
Maki, N., Shimura, Y., and Tsuchida, R., Bull. Chem. Soc. Japan, 30, 909 (1957).
Vlček, A. A., Nature, 180, 753 (1957).
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MAKI, N., FUJITA, J. & TSUCHIDA, R. Polarography of Pentacyanocobaltate(III) Complexes. Nature 183, 458–459 (1959). https://doi.org/10.1038/183458a0
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DOI: https://doi.org/10.1038/183458a0
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