A　3-D　supramolecular　hybrid　{[La(EPC)3(H2O)　3]2(Pb6I18)}n　(EPC　+　=　N-ethyl-pyridium-4-carboxylate)　(1)　has　been　structurally　determined,　which　assume　significance　for　its　incorporating　lanthanide　metal-carboxylic　coordination　polycation　into　polymeric　iodoplumbate　to　get　heterometallics.　1　consists　of　1-D　(Pb6I18)n6n-　zigzag-like　anion　chains　with　lanthanide　metalcarboxylic　[La(EPC)　3(H2O)3]n3n+　polycations,　which　arrange　in　a　criss-cross　configuration.　C-HI　and　C-HO　hydrogen　bonds　among　inorganic　anions　and　polycations　contribute　to　the　formation　of　a　3-D　supramolecular　framework.　Moreover,　the　framework　displays　an　absorption　edge　at　2.46　eV　which　is　comparable　to　PbI2＇s　absorption　edge.　©　2012　Elsevier　B.V.　All　rights　reserved.