Abstract
Hydrothermal reactions of NiII, di-4-pyridylamine (dpa) and the appropriate oxide yield materials of the NiII–organodiamine–EO42– family. Specifically, reaction of NiCl2·6H2O, dpa, and MoO3 in water at 120 °C yielded [Ni(dpa)2(MoO4)] 1, while the reaction of NiSO4·6H2O and dpa in water at 120 °C gave [Ni(dpa)(SO4)(H2O)]·2H2O 2. The structures reveal the dramatic influence of the anion identity and ligation modes in the {Ni(dpa)n}n2n+ substructure. The structure of 1 is constructed from two motifs, two-dimensional {Ni(dpa)}n2n+ sheets and one-dimensional {NiMoO4}n chains, to produce a three-dimensional covalently linked framework. In contrast, the {Ni(dpa)}n2n+ substructure of 2 is three-dimensional, with co-ordinated SO42– and aqua ligands projecting into channels formed by the {Ni(dpa)}n2n+ framework. The void is reduced through the common characteristic of interpenetration, such that the structure of 2 exhibits two independent three-dimensional frameworks.
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