Two new Zn-II and Cd-II coordination polymers of trans-1,2-bis(4-pyridyl)ethene (bpe) and 1,3-di(4-pyridyl)propane (bpp) with anionic nitrite ligands, [Zn(mu-bpe)(NO2)(2)](n) (1) and [Cd-2(mu-bPP)(3)(NO2)(4)](n) (2) have been synthesized and characterized by elemental analysis, IR-, H-1 NMR-and C-13 NMR spectroscopy and studied by X-ray crystallography. The structural studies of (1) and (2) show the compounds are one- and three-dimensional polymers with coordination environments of distorted octahedral and pentagonal bipyramide, ZnN2O4 and CdN3O4, respectively. Self-assembly of these compounds in the solid state via pi-pi-stacking interactions is discussed. (c) 2006 Elsevier SAS. All rights reserved.