Two　europium(III)　coordination　polymers　(CPs),　namely,　poly[[di­aqua­bis­(μ4-1H-benzimidazole-5,6-di­carboxyl­ato-κ6　N　3:O　5,O　5′:O　5,O　6:O　6′)(μ2-oxalato-κ4　O　1,O　2:O　1′,O　2′)dieuropium(III)]　dihydrate],　{[Eu2(C9H4N2O4)2(C2O4)(H2O)2]·2H2O}　n　(1),　and　poly[(μ3-1H-benzimidazol-3-ium-5,6-di­carboxyl­ato-κ5　O　5:O　5′,O　6:O　6,O　6′)(μ3-sulfato-κ3　O:O′:O′′)europium(III)],　[Eu(C9H5N2O4)(SO4)]　n　(2),　have　been　syn­thesized　via　the　hydro­thermal　method　and　structurally　characterized.　CP　1　shows　a　three-dimensional　network,　in　which　the　oxalate　ligand　acts　as　a　pillar,　while　CP　2　has　a　two-dimensional　network　based　on　a　europium(III)-sulfate　skeleton,　further　extended　into　a　three-dimensional　framework　by　hydrogen-bonding　inter­actions.　The　structural　diversity　in　the　two　com­pounds　can　be　attributed　to　the　different　acidification　abilities　and　geometries　of　the　anionic　ligands.　The　luminescence　properties　of　1　display　the　characteristic　europium　red　emission　with　CIE　chromaticity　coordinates　(2/3,　0.34).　Inter­estingly,　CP　2　shows　the　characteristic　red　emission　with　CIE　chromaticity　coordinates　(0.60,　0.34)　when　excited　at　280nm　and　a　near-white　emission　with　CIE　chromaticity　coordinates　(0.38,　0.29)　when　excited　at　340nm.　©　2020.