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1 2006

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Equilibria in Cobalt(II) - Amino Acid - Imidazole System under Oxygen-free Conditions. Part I. Studies on Mixed Ligand Systems with L-alfa-Alanine

Woźniczka M., Pająk M., Vogt A., Kufelnicki A.

Polish Journal of Chemistry

2006

Vol. 80, nr 12

1959-1966

Glass electrode potentiometry and UV/Vis spectrophotometry experiments have been carried out in order to determine the equilibria in an oxygen-free Co(II)-Amac-Himid system in aqueous solution, where Amac = L-alfa-alanine and Himid = 1,3-diazole (imidazole). The presence of axial imidazole in the structure of the ternary complex was implicated by using a [Co(imid)2]n polymer as starting material. Two proposed coordination modes of the mixed-ligand complex have been confirmed both by suitable experimental methods and by a fitting procedure (using EMF and absorbance data). One of these coordination modes is known as a model imitating the metal center in hemoglobin, whereas the other one has not been considered as yet.