Three　novel　Ln-Cd　heterometal　organic-inorganic　hybrid　materials,　[LnCd(phen)(ox)(1.5)(SO4)(H2O)(2)].H2O　(type　I:　Ln　=　Sm1a;　Eu　1b;　phen　=　1,10-phenanthroline;　H2ox　=　oxalic　acid)　and　[EuCd2(Meimdc)(2)(Ac)(H2O)(2)].H2O　(type　II:　2;　H(3)Meimdc　=　2-methyl-imidazole-4,5-dicarboxylic　acid;　HAc　=　acetic　acid)　have　been　successfully　synthesized　under　hydrothermal　conditions.　The　type　I　compounds　are　the　first　examples　of　Ln-Cd　heterometal　organic-inorganic　hybrid　sulfate-carboxylates　with　a　lattice　bilayer　structure.　The　extended　structure　of　type　II　consists　of　EuCd(Meimdc)　and　Cd-2(Meimdc)　helices　cross-linked　through　Ln-Cd　oxo-cluster　chains,　showing　a　3D　microporous　architecture　with　left-/right-handed　helical　tubes　(L1/R1)　and　channels　(L2/R2)　along　the　b　axis.　The　luminescence　properties　of　complexes　1b　and　2　exhibit　the　characteristic　emission　bands　of　Eu3+　ions.　The　photoluminescence　spectra　of　1b　and　2　show　characteristic　line-splitting　at　room　temperature,　depending　on　the　site-symmetry　of　Eu3+　ions　in　the　complexes.