Investigation of Formula and Stability Constant for Metal Ion Complexes with Keto Derivatives of Glycogen: Spectrophotometric Determination Combined with TD-DFT Insights. | ||
| New Valley University Journal of Basic and Applied Sciences | ||
| Articles in Press, Accepted Manuscript, Available Online from 07 August 2025 | ||
| Document Type: Original papers | ||
| DOI: 10.21608/nujbas.2025.374616.1035 | ||
| Authors | ||
| Samia M Ibrahim1; Doaa 01148472524 Mohammed Ahmed Mohammed2; Mohamed Abd El-Aal3; Ahmed F Al-Hossainy* 4 | ||
| 1Chemistry Department, Faculty of Science, New Valley University, El-Kharga 72511, New Valley, Egypt. | ||
| 2a Chemistry Department, Faculty of Science, New Valley University, El-Kharga 72511, New Valley, Egypt. | ||
| 3Chemistry Department, Faculty of Science, Assiut University, Assiut 71516, Egypt | ||
| 4Chemistry, Faculty of science, New Valley university | ||
| Abstract | ||
| The interaction of (Keto-Gly) with various metal ions (Co+2, Cd+2, Pb+2, Mn+2, Fe+3 and Ag+) in aqueous solution was studied by UV-Vis spectroscopy. The formation constants of (Keto-Gly) metal complexes were calculated by the use of "molar ratio method" and the "continuous variation method". The stoichiometric ratios between metal ion to (Keto-Gly) were found to be 1:2 for both (Keto-Gly)-Co, (Keto-Gly)-Cd, (Keto-Gly)-Pb and (Keto-Gly)-Ag complexes, except for (Keto-Gly)-Mn complex which exhibit 2:5 metal to ligand ratio and (Keto-Gly)-Fe complex which exhibit 2:3, 2:5 and 2:7 metal to ligand ratio. The stability constants of the complexes of keto-Gly with (Co+2, Cd+2, Pb+2, Mn+2, Fe+3, and Ag+) at 25 °C were calculated throughout using the Job and molar ratio methods. The formation constants determined by the two methods are in good agreement. Theoretical calculations of (keto-Gly) and (keto-Gly)-Cd complexes were performed using time-dependent density functional theory (TD-DFT) with the DMol3 optimization method. | ||
| Keywords | ||
| Glycogen product of oxidation; Metal ions; Spectrophotometry; Stability constant; TD-DFT | ||
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