Les phases cyanures de nickel(II) hydratés

Abstract

A critical study of the preparation and properties of the hydrated forms of Ni cyanide shows the existence of three different phases in the compounds Ni(CN) 2 •xH 2 O.•By X-ray diffraction and u.v.–visible spectroscopy, it is found that all three phases are formed by different stacking of polymeric [Ni(H 2 O) 2 Ni(CN) 4 ] ∞ layers similar to the [Ni(NH 3 ) 2 Ni(CN) 4 ] ∞ layers existing in Ni amminocyanides, with interlamellar noncoordinated H 2 O molecules. All three phases are indexed in the orthorhombic system and can be given as Ni(H 2 O) 2 Ni(CN) 4 •yH 2 O.