Search results for "hydroxamate compounds"

Complex formation of copper(II), nickel(II) and zinc(II) with ethyl phosphonohydroxamic acid : solution speciation, synthesis and structural characte…

2019

The first example of a Cu(II) 12-MC-4 hydroxamic metallacrown containing an ethylphosphonate group as an additional donor function in the β-position with respect to the hydroxamic group is described. The solution equilibrium of ethylphosphonoacetohydroxamic acid (PAHEt) with Cu(II) was investigated in aqueous solution by a combination of potentiometry, mass spectrometry, UV-Vis and EPR spectroscopies, and isothermal titration calorimetry. A model containing mononuclear [CuL], [CuL2]2− and [CuL2H−1]3− and pentanuclear [Cu5(LH−1)4]2− species is proposed. The predominance of the [Cu5(LH−1)4]2− species in solution over the pH range 4–9 was confirmed by the signals present in the ESI-MS spectra,…