a b s t r a c t The reaction of metal(II) nitrates with oxamide-N,N 0 -diacetic acid (H 4 L) in aqueous media under mild conditions, leads to the formation of novel coordination polymers formulated as {[M(H 2 L)(H 2 O) x ]Á 2(H 2 O)} n where M = Co(II), x = 4 (1); Ni(II), x = 4 (2); Zn(II), x = 3 (3); Cd(II), x = 3 (4); Ca(II), x = 2 (5). Com-pounds 1–4 are 1D polymers with the ligand being doubly deprotonated and coordinated through the carboxylic edges. Compound 5 is a 2D polymer with the ligand utilizing all of the available oxygen atoms for coordination. In all cases extended hydrogen bonding leads to the formation of 3D supramolecular architectures. The structures are discussed in terms of topological description. The synthesized com-pounds were also characterized with spectroscopic techniques and their stability was checked with ther-mal studies.