Synthesis, crystal structure and Hirshfeld surface analysis of <i>catena</i>-poly[[bis(semicarbazide-κ<sup>2</sup> <i>N</i>,<i>O</i>)copper(II)]-μ-sulfato-κ<sup>2</sup> <i>O</i>:<i>O</i>′]
Acta crystallographica. Section E, Crystallographic communications