Two　isostructural　3D　lanthanide　arenedisulfonate　metal-organic　frameworks　(MOFs)　[Ln(Hbidc)(nds)0.5(H2O)]n(Ln=Eu(1),　La(2))　have　been　successfully　synthesized　by　the　hydrothermal　reaction　of　lanthanide　oxide　with　2,6-naphthalenedisulfonate　sodium　(Na2nds)　and　an　auxiliary　ligand,　1H-benzimidazole-5,6-dicarboxylic　acid　(H3bidc).　The　two　complexes　are　both　constructed　from　2D　[Ln(Hbidc)]+　double　layers　pillared　by　nds2-　ligands　to　generate　3D　(3,　8)-connected　open-framework　structures　with　1D　long　narrow　channels　running　along　the　a　axis.　From　topological　point　of　view,　the　3D　framework　is　a　(3,　8)-connected　tfz-d　net.　The　weak　interactions　including　N-H⋯O,　O-H⋯O　hydrogen　bonds　and　π-π　stacking　are　observed　in　1.　The　2D　IR　correlation　spectroscopy　was　applied　to　study　the　molecular　interactions　induced　by　thermal　perturbation.　The　emission　spectra　of　1　exhibit　the　characteristic　transition　of　5D0→7FJ(J=0-4)　of　Eu(III).　©　2013　Elsevier　Inc.