Text this: Crystal structures of (2,2′-bipyridyl-κ2N,N′)bis[N,N-bis(2-hydroxyethyl)dithiocarbamato-κ2S,S′]zinc dihydrate and (2,2′-bipyridyl-κ2N,N′)bis[N-(2-hydroxyethyl)-N-isopropyldithiocarbamato-κ2S,S′]zinc