Crystal structure of a Cu<sup>II</sup>complex with a bridging ligand: poly[[pentakis[μ<sub>2</sub>-1,1′-(butane-1,4-diyl)bis(1<i>H</i>-imidazole)-κ<sup>2</sup><i>N</i><sup>3</sup>:<i>N</i><sup>3′</sup>]dicopper(II)] tetranitrate tetrahydrate]
Acta crystallographica. Section E