Abstract
The stability constants of metal complexes formed between Cu 2+ , Zn 2+ , Hg 2+ , UO 2+ 2 , VO 2+ , Ni 2+ , Co 2+ and Fe 3+ metal ions with 5-carboxyuracil and 5-carboxy-2-thiouracil were determined by potentiometric titration technique. Calvin-Bjerrum pH titration method us modified by Irving-Rossotti was used to calculate the proton-ligand stability constants (log K H 1 , log K H 2 ) and metal-ligand stability constants (log β n ) values in aqueous, 80: 20% (v/v) water-ethanol and water-DMSO media at 15 °C temperature and constant ionic strength of 0.1 M NaCl. The correlation between log β n values and various parameters relating to ligand as well as metal are discussed. The negative ΔG 0 values indicate that complex formation is spontaneous one.
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