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Abstract
The formation of Ni(II) ion complexes with cefaclor has been investigated by ultraviolet spectroscopy. This study has shown that cefaclor and Ni2+ interact in weak acidic medium to give a Ni(CEF)+ complex which easily hydrolyzes giving a hydroxo complex Ni(OH)(CEF). This complex species at pH = 8.70 shows absorption bands in the range from 400 to 294 nm, with a maximum at 316 nm. Using the Job method, the molar ratios method and the method of relative recovery of complex species the stoichiometric ratio cefaclor: Ni(II) = 1:1 was found. The molar absorptivity value, ∊ = 1.12 ×0.02 x 103 1 mol−1 cm−1 at 316 nm and the concentration constant of the hydroxo complex log K 2 = 8.3 × 0.1 1 / mol, were determined at pH = 8.70 and at an ionic strength of μ = 0.01.