Due to many coordination possibilities of the 2,3-pyridinedi-carboxylic acid (2,3-pdc), it has been intensively used to synthesize various coordination polymers with 1D, 2D and 3D supramolecular architectures. In this paper, we describe the synthesis, IR spectrum and thermal behavior of Mn-Cu pair coordination polymer of the composition {[Cu(2,3-pdc)2Mn(H2O)6]·2H2O} (1), which has the same structure with the complex mentioned by Brain O. Patric et all., who obtained the complex using [Cu(2,3-pdc)2][Na2(H2O)6··2H2O) and MnCl2 as initials. In our case, it has been established the complex 1 can be obtained from direct way using Mn(CH3COO)2·4H2O, Cu(CH3COO)2·H2O, 2,3-pdc in molar ratio 1:1:2 in water solution. Dark blue crystals of the 1 has been studied by X-ray crystallography method. The crystal structure of 1 presents a single chain polymer and, the structure is extended to 3D due to H-bonding system with participating of all water molecules. The monomeric unit has cation-anion type structure. Each Cu2+ ion has a tetragonally distorted octahedral coordination sphere and it constitutes cation with the charge (-2). Each Mn2+ ion is bound to six oxygen atoms from six water molecules and forms the anion part. The bridging ligands are fully deprotonated.  In the IR spectrum of compound strong vas(COO-) absorption bands at 1623, 1588 cm- and also vs(COO-) absorption bands at 1369 and 1363 cm-1 are revealed. The absence of characteristic bands in the range 1690-1730 cm-1 confirms that ligands are fully deprotonated. The thermal stability of 1 has been studied in the 20-1000oC temperature range. The thermogram exhibits three distinct decomposition steps. In the 20-210oC range DTA, DTG curves show two endothermic effects which correspond to loss of external and coordinated water molecules. An essential mass loss can be observed from the third endothermic effect, which corresponds to breaking and burning of two 2,3-pdc molecules. The complex are stable up to 290oC after the consecutive elimination of the water molecules.