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The stability constants of the 1:1 complexes formed between Mg 2+ , Ca 2+ , Sr 2+ , Ba 2+ , Mn 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+  or Cd 2+  (= M 2+ ) and 5,6-dichloro-l-(β-ᴅ-ribofuranosyl)benzim idazole (DRB) were determined by potentiom etric pH titrations in aqueous solution (25 °C; I = 0.5м, NaNO 3 ). The acidity constant of H(DRB) + , the proton being at N3, was measured by the same method and the result was confirmed via spectrophotometry. Based on previously established [L. E. Kapinos, B. Song, H. Sigel, Inorg. Chim . Acta 280, in press (1998)] log м  мʟ  versus K ʜ  ʜʟ  straight-line plots for complexes of imidazole-type ligands it is shown for the Mn(DRB) 2+  and Zn (DRB) 2+  complexes, as examples, that the benzene ring of the benzim idazole residue exerts a steric inhibition for metal ion binding at N3; i.e., the data points for the M(DRB) 2+  complexes fall clearly below the straight lines defined by the imidazole- type ligands.

Metal Ion-Binding Properties in Aqueous Solution of the Nucleoside Analogue, 5,6-Dichloro-1-(β-ᴅ-ribofuranosyl)benzimidazole (DRB)