Three new metal-organic coordination polymers, [Mn(4,4′-bpy)(H 2 BTCA)(H 2 O) 2 ](4,4′-bpy) (1), [Na 2 Co(BTCA) 0.5 (OXA)]·3H 2 O (2) and [Na 2 Co(BTCA)(H 2 O) 2 ] (3), (H 4 BTCA = benzene-1,2,4,5-tetracarboxylic acid, H 2 OXA = oxalic acid) have been synthesized, which are characterized by elemental analysis, infrared spectrum and x-ray crystal diffraction. Complex 1 possesses a 3D polymeric structure, which is comprised of (4,4)-layers. Hydrogen bonds play a dominant role in the construction of the final 3D supramolecule. 1D channels are observed in complex 2, which can be ascribed to pillared-layer motifs.