A　series　of　lanthanide-organic　frameworks　[Ln(Himdc)(ina)(H2O)]n　(Ln　=　Eu　1a;　Sm　1b;　and　Nd　1c,　H3imdc　=　imidazole-4,5-dicarboxylic　acid,　Hina　=　isonicotinic　acid)　were　synthesized　under　hydrothermal　conditions.　All　compounds　1a-1c　consist　of　a　3D　microporous　lanthanide　carboxylate　([Eu(COO)3]n)　framework　and　uncoordinated　Lewis　basic　pyridyl　and　imidazole　groups　hung　in　the　channels.　The　luminescence　investigations　show　that　the　compound　1c　displays　an　interesting　NIR　luminescence　property.　The　compound　1a　exhibits　a　good　potential　as　a　luminescent　multi-responsive　sensing　material　for　Fe3+　ions　and　Cr2O7　2-　anions.　©　2017　The　Royal　Society　of　Chemistry.