Conditions for the preparation of Mn(II), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes with 4-methoxy-2-methylbenzoic acid were investigated and their quantitative composition, magnetic moments and solubilities in water at 293 K were recorded. IR spectra and powder diffractograms of the complexes, prepared with molar ratio of metal to organic ligand of 1.0 : 2.0 and general formula M(C9H9O3)2_nH2O, where n = 1 forMn, Co, Ni,Cu, n = 2 forCd and n = 0 forZn, were recorded and their thermal decomposition in air was studied. During heating the complexes are dehydrated in one step and next the anhydrous complexes of Cu, Zn and Cd decompose directly to oxides (MO), whereas the complexes of Mn, Co and Ni decompose to oxides (Mn3O4, Co3O4, NiO) with intermediate formation of the mixture of free metals and their oxides. The effective magnetic moments the paramagnetic complexes of Mn(II), Co(II), Ni(II) and Cu(II) attain at 303 K values 5.65, 4.69, 3.18 and 1.27 B.M., respectively. On the basis of IR spectra it can be suggested that carboxylate groups are bidentate asymmetric bridging ligands.