Solution properties of Cu(II)-sarcosinehydroxamic acid

Species distribution and relevant stability constants of species present in aqueous solutions of Cu(II) with bidentate sarcosinehydroxamic acid (CH₃NHCH₂CONHOHHl) have been obtained by analytical potentiometry at 25 °C and I = 0.1 M (NaClO₄). Together with ESR of frozen solutions measurements, these results show the existence of four different complex copper(II) species, one of which as a dimeric one. The solution electronic spectra are also reported. The structure of the complexes are discussed and conclusions are drawn based on absorption and ESR spectra.