research papers
In a novel three-dimensional ZnII complex prepared by the solvothermal assembly of Zn(NO3)·6H2O, naphthalene-1,4-dicarboxylic acid (1,4-H2ndc) and 4,4′-bipyridine (bpy), the two crystallographically independent Zn atoms adopt the same four-coordinated tetrahedral ZnO3N geometry. The supramolecular secondary building unit (SBU) is a distorted paddle-wheel-like {Zn2(COO)2N2O2} unit and these units are linked by 1,4-ndc ligands within the layer to form a two-dimensional net parallel to the ab plane, which is further connected by bpy ligands to give rise to a three-dimensional framework.