Abstract
The isomorphous title compounds, [Ni{(NH(2))(2)CO}(4)(H(2)O)(2)](NO(3))(2) and [Co{(NH(2))(2)CO}(4)(H(2)O)(2)](NO(3))(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-H...O-N, O-H...O-N and N-H...O-H. Graph-set analysis was applied to distinguish the hydrogen-bond patterns at unitary and higher level graph sets.
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