Abstract
Abstract The formation of complex ions between cefaclor and Cu 2+ has been investigated by ultraviolet spectroscopy. The conditions of formation of complex ions were studied in weak acidic, neutral and alkaline medium in the pH range from 5.60 to 11.05. The interaction between cefaclor and Cu(II) ion in acidic medium results in the formation of Cu(CEF) + complex and it is supposed that the ligand acts as zwitterion which is coordinated to the metal ion. This complex easily hydrolyzes giving a hydroxo complex Cu(OH)(CEF). The Job method, the molar ratios method and the method of relative recovery of complex species were applied and it was found that the stoichiometric ratio between cefaclor and Cu(II) is 1:1. The molar absorptivity ϵ / M −1 1 cm −1 = 2670 ± 35 at 300 nm and the consecutive concentration constant of the hydroxo complex log K 2 /M −1 1 = 9.13 ± 0.118, were determined at pH = 8.00 and at an ionic strength of μ = 0.1.
Published Version
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