Three new Zn-II sulfate complexes

The three zinc sulfate complexes presented herein display three completely different coordination modes, viz triaqua(1,10-phenanthroline-N,N')(sulfato -O)zinc(II) hydrate, [Zn(SO4)(C12H8N2)(H2O)(3)]. H2O (octahedral, monomeric ), bis(mu-sulfato-O:O')bis[(2,9-dimethyl-1,10-phenanthrolineN,N')zinc(II)], [Zn-2 (SO4)(2) (C14H12N2)(2)] (tetrahedral, dimeric), and catena-poly[[dia qua(2,2'-bipyridyl-N,N')zinc(II)]-mu-(sulfato-O:O')], [Zn(SO4)(C10H8N2)(H2O )(2)](n) (octahedral, polymeric, twofold crystallographic symmetry). In the first, the sulfate is monodentate, while in the other two it acts as a bid entate bridge between two different Zn centers. There is a variety of sulfa te S-O bond lengths, depending on the different coordination conditions and hydrogen-bonding interactions.