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The complex cyanides of chromium(II) and chromium(0)

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Summary

Chromium(II) cyanide dihydrate has been isolated from the reaction between aqueous chromium(II) and KCN; it can be dehydrated at 100°in vacuo. From the red solutions containing an excess of cyanide, crystalline hexacyanochromates(II) M4[Cr(CN)6] (M=Na or K) have been isolated: these are dihydrates at room temperature, but become anhydrous when dried at 100°in vacuo. In liquid ammonia, the hexacyanochromates(II) are reduced to the chromium(O) compounds M6Cr(CN)6 by the respective alkali metals. All of these compounds are extremely air-sensitive and are low spin; i.r. and reflectance spectra are reported as well as x-ray powder data for Na4[Cr(CN)6], K4[Cr(CN)6] and K6Cr(CN)6.

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Authors and Affiliations

  1. Donnan Laboratories, The University Liverpool, L69 3BX, Liverpool, UK

    Janice P. Eaton & David Nicholls

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  1. Janice P. Eaton
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  2. David Nicholls
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Eaton, J.P., Nicholls, D. The complex cyanides of chromium(II) and chromium(0). Transition Met Chem 6, 203–206 (1981). https://doi.org/10.1007/BF00618223

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