Mixed ligand complexes involved in the system pyridoxamine-glycylglycine-imidazole copper(II) |
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| Authors: | Hayat M Marafie Mohamed S El-Ezaby Moustafa Rashad Naguib M Moussa |
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| Institution: | Department of Chemistry, University of Kuwait, Kuwait;Department of Biochemistry, University of Kuwait, Kuwait |
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| Abstract: | Ternary as well as quaternary complexes involved in the system pyridoxamine-glycylglycine-imidazole-copper(II) have been studied by pH-metric titration at 37°C and I = 0.15 M (NaNO3). The data were assessed by program MINIQUAD 75. The formation constants were compared with those obtained from the system of pyridoxamine-glycine-imidazole with some bivalent metal ions previously reported. They are ～ 2.5 log units less. In addition, the enhancement of quaternary complex formation has been described in terms of binary and ternary complex formation reactions. It has been also found that deprotonation of the peptidic proton of glycylglycine took place in the presence of more than one different ligand. |
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| Keywords: | Author to whom correspondence should be addressed |
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