Crystal structures of (2,2′-bipyridyl-κ<sup>2</sup><i>N</i>,<i>N</i>′)bis[<i>N</i>,<i>N</i>-bis(2-hydroxyethyl)dithiocarbamato-κ<sup>2</sup><i>S</i>,<i>S</i>′]zinc dihydrate and (2,2′-bipyridyl-κ<sup>2</sup><i>N</i>,<i>N</i>′)bis[<i>N</i>-(2-hydroxyethyl)-<i>N</i>-isopropyldithiocarbamato-κ<sup>2</sup><i>S</i>,<i>S</i>′]zinc
Acta crystallographica. Section E, Crystallographic communications