Abstract
A zinc citrate coordination complex, [Zn(H2cit)(H2O)] n (1), was prepared from Zn(NO3)2 · 6H2O and citric acid at pH = 1.5–3.0 in aqueous solution. The complex was characterized by elemental analyses, IR spectroscopy and X-ray crystallography. The Zn(II) ion in complex 1 exists in an octahedral coordination environment. The citrate binds Zn(II) tridentately via its α-hydroxyl, α-carboxylate and one of the β-carboxylate groups. Complex 1 forms a chiral helical chain running along the α axis of the crystal via two bridged oxygens of the α-carboxylate group. The interconversions of different zinc citrate complexes in aqueous solution show their pH-dependent patterns.
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