Physicochemical study on bis-hydrazone derived from 1,3-diaminoguanidine and salicylaldehyde and its complexes with transition metals

The reaction of 1,3-diaminoguanidine with salicylaldehyde gave the corresponding bis-hydrazone, and complexes of the latter with copper(II), vanadyl(II), nickel(II), and manganese(II) of the composition LM2X (L is triply deprotonated hydrazone, X = CH3COO− or pyrazole) were synthesized. Their structure was determined on the basis of elemental analyses, IR, 1H NMR, and UV spectra, and low-temperature magnetochemical data.