Nitrosylpentamminecobalt chloride, black

NITROSYLPENTAMMINECOBALT(H) CHLORIDE, BLACK, AND NITROSYLPENTAMMINECOBALT(ni) CHLORIDE, PINK... 

Dichloro(di-2-pyridylamine)-cobalt(II), synthesis 50 Nitrosylpentamminecobalt(II) chloride, black, and nitrosyl-pentamminecobalt(III) chloride, pink (correction), synthesis 51... 

Black nitrosylpentamminecobalt(II) chloride is a lustrous, crystalline solid. It is stable when perfectly dry, but in the presence of moisture it changes rapidly to the pink isomer. Samples prepared by the above procedure appear to be particularly stable, some having been kept for at least 5 years without decomposition. 

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