Acta Cryst. (2009). E65, i52  [ doi:10.1107/S160053680902251X ]

Intercalated brucite-type layered cobalt(II) hydroxysulfate

B. Yotnoi, S. Luachan, T. J. Prior and A. Rujiwatra

Abstract: In an attempt to synthesize new cobalt(II) sulfate framework structures using 1,4-diazabicyclo[2.2.2]octane as a template, crystals of poly[0.35-[hexaaquacobalt(II)] [tri--hydroxido--sulfato-dicobalt(II)]], {[Co(H₂O)₆]_0.35[Co₂(OH)₃(SO₄)]}_n, were obtained as a mixture with [Co(H₂O)₆]SO₄ crystals. The crystal structure can be described as being constructed from discrete brucite-type [Co₄(OH)₆(SO₄)₂] layers, each of which is built up from edge-shared [Co(OH)₆] and [Co(OH)₄(OSO₃)₂] octahedra, with partial intercalation by [Co(H₂O)₆]²⁺ ions. The absence of ca 30% of the [Co(H₂O)₆]²⁺ cations indicates partial oxidation of cobalt(II) to cobalt(III) within the layer.

Online 20 June 2009

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