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There are at least two known compounds, which can be called "niobium cyanide" (which by the way is not a correct name).

These are:

1) potassium octacyanoniobate(IV) dihydrate with chemical formula: K4[NbIV(CN)8].2H2O

2) potassium octacyanoniobate(III) with chemical formula: K5[NbIII(CN)8]

More information can be found in the article by P. M. Kiernan and W. P. Griffith in the Journal of Chemical Society, Dalton Transactions 1975, pp. 2489-2494

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16y ago

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