Acta Crystallographica Section C

Crystal Structure Communications

Volume 65, Part 12 (December 2009)

inorganic compounds

fa3208 scheme

Acta Cryst. (2009). C65, i91-i93 [ doi:10.1107/S0108270109044394 ]

Novel heptavalent actinide compounds: tetrasodium dihydroxidotetraoxidoneptunate(VII) hydroxide dihydrate and its plutonium analogue

M. S. Grigoriev and N. N. Krot

Abstract: The title compounds, Na₄[NpO₄(OH)₂]OH·2H₂O and Na₄[PuO₄(OH)₂]OH·2H₂O, are isostructural and isomorphous, and contain complex [AnO₄(OH)₂]^3- anions (Ac is an actinide) in the form of distorted tetragonal bipyramids, Na⁺ cations, crystallization water molecules and outer-sphere OH groups. The complex [AnO₄(OH)₂]^3- anions occupy general positions and the coordinated OH groups deviate significantly from a centrosymmetric relative orientation. The [AnO₄(OH)₂]^3- anions exhibit anisotropic actinide contraction; the shortening of the An-O(hydroxide) bonds on going from Np to Pu is greater than that of the AnO₄ groups.

Formula: Na₄[NpO₄(OH)₂]OH·2H₂O and Na₄[PuO₄(OH)₂]OH·2H₂O


	Structure factor file (CIF format) (309.6 kbytes) [ doi:10.1107/S0108270109044394/fa3208Isup2.hkl ] Contains datablock I

	Structure factor file (CIF format) (479.3 kbytes) [ doi:10.1107/S0108270109044394/fa3208IIsup3.hkl ] Contains datablock II

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