Diammonium hexaaquacopper(II) disulfate-d 20 , [ND 4 ] 2 °u(D 2 O) 6 ](SO 4 ) 2 , M r =419.7, monoclinic P2 1 /a, a=9.393 (2), b=12.666 (2), c=6.061 (1) A, β=107.16 (1) o , V=689.0 (4) A 3 , Z=2, Mo Kα radiation, λ=0.71069 A, μ=2.01 mm -1 , F(000)=415.3 (414.0 without anomalous dispersion), T=9 (1) A, R(I)=0.013, R(F)=0.0095, χ 2 =0.89, 5134 reflections. Refinement of the X-ray data, using a radially augmented multipolar charge model, gave thermal and positional parameters agreeing with those derived from neutron diffraction data and the correct cell content of electrons
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Figgis et al. (1993) studied this question.