Abstract
Abstract The title complex is built up of [Ni(bpy)3]2+ cations, [Ni(CN)4]2− anions and non-coordinated bpy and water molecules. The water molecules along with one of the two crystallographically independent tetracyanonickellate anions form layers, in which H-bonds (HB's) of the types O-H ‥ O and O-H ‥ N are important. The remaining tetracyanonickellate anions bound by H-bonds to water molecules in the layers are placed approximately perpendicular to the layers making interconnection between them. So by HBs a 3D network is formed (hydrophilic host part of the structure). The cations and non-coordinated bpy molecules (hydrophobic guest part of the structure) are placed in cavities formed by HBs. The Ni-N distances in the cation are within the range 2.078(3)-2.100(3) A and the Ni-C distances in the anion are within the range 1.854(5)-1.873(4) A.
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