Abstract
Interaction between l-arabinose and the zinc group metal-ion salts has been studied in aqueous solution and solid complexes of the type M( l-arabinose)X 2· nH 2O, where M = Zn(II), Cd(II), and Hg(II) ions, X = Cl − or Br −, and n = 0–2 have been isolated and characterized. On comparison with the structurally known Ca( l-arabinose) Cl 2·4H 2O and the corresponding magnesium compounds, it is concluded that the Zn(II) and Cd(II) ions are six-coordinated, binding to two arabinose moieties via 03, 04 of the first and 01, 05 of the second sugar molecule as well as to two H 2O molecules. The Hg(II) ion binds only to two sugar molecules in a similar fashion to zinc and cadmium ions, resulting in a four coordination around the mercury ion. The strong intermolecular hydrogen bonding network of the free arabinose is rearranged to that of the sugar OH...H 2O...halide system upon metalation. The β-anomer sugar conformation is predominant in the free sugar, while the α-anomer conformation is preferred by the alkaline earth and Zn(II), Cd(II), and Hg(II) cations.
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