Earlier in laboratory of bioinorganic chemistry of the Institute of Chemistry of the Academy of Sciences of Moldova the systematic purposeful synthesis, investigation of properties and structure particularities of coordination compounds on the basis of new polydentate multifunctional hydrazones as well as the study of their biological activity were carried out [1]. In continuation of previous research, 8 new coordination compounds of Cu(II) with aminoguanizone of pyruvic acid (H2paag) were synthesized [2]. X-ray analysis of these complexes revealed, that most of these compounds have dimeric or polymeric structure [3]. As a rule in such complexes there is an exchange magnetic interaction. One of the methods, allowing to elucidate the presence of the magnetic exchange interaction, is the measurement of the magnetic susceptibility. We measured magnetic properties of synthesized complexes at room temperature for compounds Cu(paag)·nH2O, CuX(Hpaag), where Х = CH3COO-, SO4 2-, NO3 -, Cl-, Br-. The obtained values of the effective magnetic moment of these complexes vary from 1,63 to 2,19 ВМ, which are in a good concordance with the analogous values for other copper compounds without the magnetic exchange interaction. The temperature dependence of a magnetic susceptibility of polymeric bromide complex, Cu(Hpaag)·Br [3] (see fig.), measured in the range of temperatures 110-291 K, follows to the Curie-Weiss law, specifying thus the absence of exchange magnetic interaction between paramagnetic copper(II) ions. The obtained data don’t contradict the EPR spectra results [2].