X-ray study on the nickel(II)-oxydiacetic system and its 1,10-phenanthroline and 2,2′:6′,2′′ terpyridine complexes

Three new metal–organic coordination complexes have been prepared and their crystal structures determined: [Ni(oda)(H2O)3]·1.5H2O, [Ni(oda)(phen)(H2O)]·1.5H2O and [Ni(oda)(terpy)]·2H2O (oda=oxydiacetate, phen=1,10-phenanthroline, terpy=2,2′:6′,2′′ terpyridine). The oxydiacetate ligand is tridentate in these compounds, being hinged in the first and nearly planar in the other two. Hydrogen-bonding and π–π interaction is extensive in the solids.