Coordination polymers recently known as metal-organic frameworks (MOFs) have become a forefront in scientific research and public interest, due to the potential for neutral guest bonding including gas storage studies such as hydrogen storage and gas separations [1]. The supramolecular coordination chemistry orientates around various deprotonated anions states of benzenepolycarboxylate ligands and their subsequent coordination to transition metals. {[Co(BIBP)1.5(HBTB)]∙2H2O}n was synthesized using hydrothermal techniques, where BIBP = 4,4'-bis(1H-imidazol-1-yl)biphenyl and HBTB = monoprotonated form of 1,3,5-tris(4-carboxyphenyl)benzene. The compound structure was determined by X-ray analysis showing a new one-dimensional polymer chain. The coordination number of the metal center is 5 with a distorted trigonal bipyramidal surrounding. The three carboxylic groups have a different role: one coordinates cobalt(II) ion in a monodentate way, while the second has a bidentate chelating effect upon a vicinal metal ion. The third group remains protonated, thereby hindering the process of polymer "growth" (Fig. 1).figureFig. 1. The 1D chain of [Co(BIBP)1.5(HBTB)]n, water molecules within pores are omitted. Sorption properties have been tested through N2 adsorption, unfortunately surface area (SBET = 12.24 m2/g) is small comparing with values known from literature. On the other hand, an important feature of the polymer is thermal stability - after water molecules removal from pores the polymer is thermally stable until 340 °C, and then decomposes in 3 steps.