A　new　rare　earth　organic　complex　with　a　double　interleaved　structure,　namely　[Sm(BDC)(1.5)(DME)(H2O)](n)　(H2BDC　=　1,4-benzenedicarboxylic　acid,　DMF　=　N,N＇-dimethyl　formamide)　was　synthesized.　The　crystal　structure　is　of　triclinic,　space　group　P　(1)　over　bar　with　a　=　8.6343(6),　b　=　10.1470(5),　c　=　11.2073(6)　angstrom,　alpha　=　65.495(5),　beta　=　71.626(5),　gamma　=　78.130(5)degrees,　V　=　844.70(9)　angstrom(3),　C15H15NO8Sm,　M-r　=　487.64,　Z　=　2,　D-c　=　1.917　g/cm(3),　F(000)　=　476,　mu　=　3.519　mm(-1),　R　=　0.0380　and　wR　=　0.0864　for　3504　observed　reflections　(I　＞　2　sigma(I)).　The　structure　has　been　determined　by　single-crystal　X-ray　diffraction　analyses　and　displays　a　2-fold　interpenetrated　3D　network　with　the　classical　pcu　topology.　The　compound　was　analyzed　by　X-ray　powder,　infrared　spectroscopy,　thermogravimetric　analysis　and　fluorescent　spectroscopy.　The　fluorescent　property　makes　it　a　good　candidate　for　photoactive　materials.