The complexing properties of oxalodihydrazide, acethydrazide and formic hydrazide with Cu(II) in aqueous solution

New coordinating properties of three hydrazides towards copper(II) in aqueous solutions were determined by means of various methods (ISE, pH-metric, UV-Vis, EPR and ESI-MS). Stability of hydrazide complexes in acidic pH indicates their potential use against acidophilic bacteria.