Two　chiral　lanthanide-organic　frameworks,　[Ln(Hpzc)(Hida)]n　(1:　Ln　=　Eu　1a;　Sm　1b;　H2pzc　=　pyrazole-3-carboxylic　acid,　H3ida　=　iminodiacetic　acid)　based　on　rigid　and　flexible　ligands　were　hydrothermally　synthesized　and　characterized.　Both　compounds　1a　and　1b　possess　unprecedented　3D　3,5-connected　lanthanide-organic　frameworks　with　intersecting　multidirectional　helical　channels.　The　luminescence　properties　reveal　that　complexes　1a　and　1b　exhibit　the　characteristic　emission　bands　of　Ln3+　ions.　The　photoluminescence　spectrum　of　1a　reveals　characteristic　line-splitting　at　room　temperature,　depending　on　the　site-symmetry　of　Eu3+　ions　in　the　complex.　Second-harmonic　generation　(SHG)　measurements　reveal　that　1a　exhibits　moderate　SHG　signals.　This　journal　is　©　The　Royal　Society　of　Chemistry　and　the　Centre　National　de　la　Recherche　Scientifique.