Magnetic properties of binuclear copper (II) nitrate complexes with acetyl and heptoyl hydrazones of substituted salicylaldehyde of type I were compared with photolytic and complexation properties of ligands. It is shown that parameters of antiferromagnitic exchange in dimeric complexes of type II with heptoyl hydrazones of substituted salicylaldehide derivatives (R2 = C6H13) are linear dependent on Hammett constants of substituents σp. In case of complexes with R2 = CH3 exchange parameters of binuclear complexes also vary significantly with substituent R1. For both types of ligands studied ionization constants of hydrazones and thermodynamic stability constants of their copper (II) complexes depend linear with respect to substituent’s sigma constants. In case of ligands with R2 = C6H13 good linear correlation is observed between exchange parameters of complexes and рКа and lgβ. For substances with R2 = CH3 dependency between values of σp, рКа и lgβ on one side and exchange parameter 2J on the other is more complicated.figureObserved correlations can’t be considered casual or incidental, because electron density on the bridging oxygen phenoxide atoms play important role in transition of magnetic exchange between copper (II) ions in complexes of type II. Based on the obtained results it can be supposed, that in some cases investigation of acid-base and complexation properties of acetyl hydrazones can be used for prognosis of binuclear complexes magnetic properties.