In this work, the thermal and spectroscopic properties of 3d-metal (Co, Cu, Zn, Mn, Ni, Fe) and sodium salts with cinchomeronic acid (3,4-pyridinedicarboxylic acid) (3,4pda) and dinicotinic acid (3,5-pyridinedicarboxylic acid) (3,5pda) were studied. The IR and Raman spectra were registered and analyzed in the range of 400-4000 cm -1 . The thermogravimetric study of synthesized compounds was done. The degree of hydration and the products of thermal decomposition were estimated. Moreover, it was done the comparison between the effect of 3d-transition metal cations and sodium cation on the degree of perturbation or stabilization of the electronic system of pyridine molecule depending on the position of carboxylic group in the ring.

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