Crystal structure of ethylenediammonium hexaaquanickel(II) sulphate: a variation on the Tutton salts
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The crystal structure of the title complex, [H3NCH2CH2NH3] [Ni(H2O)6] [SO4]2, has been determined by single-crystal X-ray diffraction methods at 295 K, being refined by full matrix least squares to a residual of 0.032 for 2532 independent 'observed' reflections. Crystals are monoclinic, P21/n, a 13.148(3), b 7.119(3), c 8.245(2) Ŭ ߠ100.97(4)ꬠZ = 2. Both cations are disposed about crystallographic centres of symmetry. The organic species has a necessarily planar non-hydrogen atom skeleton [C-C, 1.513(3); C-N, 1.485(4) ŝ. In the hexaaquanickel(11) species, the Ni-O distances are very similar [2.060(2), 2.064(2), 2.066(2) ŝ, although there is a significant departure from octahedral symmetry among the angles [89.71(8), 86.87(8), 90.00(8)Ꝯ The oxygen atoms of the water molecules are bonded pseudo-tetrahedrally. The centrosymmetric metal atom environment is more regular than that in the corresponding Tutton salts, to which complexes of the present type may present an attractive alternative.
Australian Journal of Chemistry