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Abstract
The complexes formed between Cu(II) ions and Cimetidine (CM) in solution have been investigated by means of potentiometric titration, spectrophotometry and electron spin resonance spectroscopy. The stability constants of Cu(CM)2+ and Cu(CM)2 2+ are 1g β1 = 4.05±0.03 and 1g β2 = 8.47 ± 0.02 respectively. Based on the σ(S) → Cu(II), πN(ImH) → Cu(II) LMCT frequencies and values of the stability constants we propose a bidentate behaviour of the CM through the N(ImH) and S(thioether) donor atoms.