Acta Cryst. (2007). C63, m448-m450 [ doi:10.1107/S0108270107040437 ]
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O)MII dinitrates, with M = Ni and CoAbstract: The isomorphous title compounds, [Ni{(NH2)2CO}4(H2O)2](NO3)2 and [Co{(NH2)2CO}4(H2O)2](NO3)2, feature discrete centrosymmetric cations in octahedral coordinations, formed by four urea molecules linked via their O atoms to the central ion in equatorial positions and two water molecules in trans positions. The complexes are packed in a pseudo-hexagonal manner separated by the nitrate counter-ions. All H atoms are involved in moderate hydrogen bonds of four types: N-H
O=C, N-HO-N, O-HO-N and N-HO-H. Graph-set analysis was applied to distinguish the hydrogen-bond patterns at unitary and higher level graph sets.
Formula: [Ni(CH4N2O)4(H2O)2](NO3)2 and [Co(CH4N2O)4(H2O)2](NO3)2
 |   Structure factor file (CIF format) (94.0 kbytes) |
| Structure factor file (CIF format) (128.0 kbytes) |
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