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The X-ray diffraction structural results of 23 ternary compounds, type M(II)(iminodiacetate-like)(hypoxanthine) [M = Co, Ni, Cu, or Zn], show that the iminodiacetate moiety conformation (mer-NO(2) or fac-NO(2)) is able to drive the M-hypoxanthine binding patterns displaying the M-N9 or M-N3 bond, cooperating with a N9-H···O intramolecular interaction, respectively.

Three new polyamine Ni(II) complexes, namely [Ni(trien)(phen)](BF 4 ) 2 1, [Ni(trien)(bipy)](ClO 4 ) 2 2 and [Ni(trien)(en)](ClO 4 ) 2 3 [trine = triethylenetetramine, phen = 1,10-phenanthroline, bipy = 2,2 0 -bipyridyl, en = ethylenediamine] have been synthesized and characterized by physicochemical and spectroscopic methods. Complexes 1 and 2 crystallize in monoclinic space group P21/c, and possess a distorted octahedral geometry. Significant hydrogen bonding interactions are found in both complexes.

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