Metal-organic frameworks (MOFs) also known as coordination polymers have become of great interest during the past few decades due to their interesting properties and fields of application [1]. Recently, a number of publications aiming coordination polymers with mixed ligands appeared [2-4]. Here we report the synthesis of two new three-dimensional MOFs of zinc(II) and nickel(II) using 1,4-bis(1H-imidazoyl-1-yl)methyl)benzene (BIB) and 3,4-pyridinedicarboxylic acid (3,4-PyDC) as ligands. Compounds display very different architectures (Fig. 1). In the zinc compound the metal center has the number of coordination 4 and a tetrahedral environment, the BIB ligand adopts the anti- conformation, and 3,4-PyDC coordinates to the metal only through the two monodentate carboxylic groups, the coordinaton node being ZnN2 BIBO2 3,4-PyDC, whereas in the nickel compound, 3,4-PyDC coordinates to the metal through both nitrogen atom and the two monodentate carboxylic groups. In this case the BIB ligand takes a syn- conformation, a water molecule completes the coordination sphere at metal center, so that nickel ion adopts the coordination number 6 and a distorted octahedral geometry. The coordination node is NiN2 BIBN3,4-PyDCO2 3,4-PyDCOH 2 O. Fig. 1. A fragment of zinc (left) and nickel (right) MOFs. Currently, the compounds are subjected to the investigation of their sorption properties.