This work reflects the synthesis of two iron(III) pivalate (polymeric) complexes with nitrogen containing ligands and the study of their sorption abilities. Iron trinuclear μ3-oxo pivalate compound [Fe3O((CH3)3CCOO)6(H2O)3](CH3)CCOO (1), is a well-known homonuclear iron cluster, which contains three iron atoms joined together via oxygen-containing ligands. Each iron atom has an octahedral coordination. One of the 6 positions around each Fe-atom corresponds to a μ3-oxigen atom, 4 positions correspond to pivalate-ligand oxygen atoms, and another one corresponds to the oxygen atom from water molecule. At the interaction of the trinuclear complex (1) with nitrogen containing ligands, the nitrogen atom is coordinating the ligand to iron atoms into the apical position, by substitution of water molecules preserving the octahedral coordination. Thereby we obtained a brown polycrystalline product (2) by interacting (1) with 4,4'-bipyridine, and a red polycrystalline product (3) as the result of interaction of (1) with pyrazine. Elemental analysis results of the studied compounds confirm the presence of the nitrogen containing ligands in the reaction products. According to data obtained from elemental analysis we are allowed to assume the formation of a polymeric structure from the reaction with 4,4'-bipyridine (Fig. 1) and a dimeric complex, in the reaction with pyrazine (Fig. 2). Preliminary X-ray studies reveal that the polymeric structure is forming a 2D chain (compound 2) consisting of blocks, one of which is represented in (Fig. 1). One block is formed by a molecule of 4,4'-bipyridine linked to an iron-core pivalate trinuclear compound through a nitrogen atom. Figure 1. Presumed structure for the compound obtained within the reaction between trinuclear iron pivalate with 4,4’-bipyridine (2). Figure 2. Presumed structure for the compound obtained within the reaction between trinuclear iron pivalate with pyrazine (3). IR spectrum and thermogravimetric analysis are in accordance with the proposed structures. Thermogravimetric analyses of both samples show lose of nitrogen containing ligand molecules at temperature range of 200 and 270 °C, with complete decomposition of the samples at about 400 OC. N2 gas sorption was studied on both samples at 77,4 K. Sorption isotherms in both cases shows hysteresis. The sample showed an N2 uptake with a BET surface area of ~8,5 m2/g, for compound containing 4,4’-bipyridine and a BET surface area of ~49,8 m2/g for compound containing pyrazine. Effective radiuses of the pores are 16,175 and 15,364 Å and total pores volume are 0,023 and 0,082 cm3/g for both compounds respectively. Gas sorption studies show us, that both compounds are porous, and that the compound with pyrazine as a ligand, can uptake considerably more N2 gas then the compound with 4,4’-bipyridil.