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Two lanthanide–glutarate coordination polymers,  viz . : {[Eu(C 5 H 6 O 4 )(H 2 O) 4 ]Cl}  n  , ( 1 ) and [Tb(C 5 H 7 O 4 )(C 5 H 6 O 4 )(H 2 O) 2 ]  n  , ( 2 ) have been synthesized and characterized by IR spectroscopy, thermogravimetric analysis, and X-ray crystallography. In  1 , the Eu(III) ions are coordinated by four O atoms from two bidentate chelating carboxylate groups, one O atom from a bridging carboxylate group and four O atoms from water molecules adopting an EuO 9  distorted tri-capped trigonal prismatic coordination geometry. In  2 , the Tb(III) ions are coordinated by six O atoms from three bidentate chelating carboxylates, one O atom from a bridging carboxylate and two O atoms from water molecules to generate distorted tri-capped trigonal prismatic TbO 9  polyhedron. In both compounds, the metal polyhedra share edges, producing centrosymmetric Ln 2 O 2  diamonds, and are linked into [001] chains by bridging glutarate di-anions. The crystal structures are consolidated by O–H···O and O–H···Cl hydrogen bonds in  1 , and O–H···O hydrogen bonds in  2 . Compound  1  exhibits a red emission attributed to the  5 D 0  →  7 F  J   ( J  = 1–4) transitions of the Eu(III) ion, whereas  2  displays green emission corresponding to the  5 D 4  →  7 F  J   ( J  = 0–6) transitions of the Tb(III) ion. Both the compounds exhibit high sensitivity and selectivity for Fe 3+  ions due to luminescence quenching compared with other metal ions, which include; Na + , Mg 2+ , Al 3+ , Cr 3+ , Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Zn 2+  and Cd 2+ . Compounds  1  and  2  also show high luminescence quenching sensitivity for 4-nitrophenol over the other aromatic and nitroaromatic compounds, namely; bromobenzene, 1,3-dimethylbenzene, nitrobenzene, 4-nitrotolune, 4-nitrophenol, 2,6-dinitrophenol and 2,4,6-trinitrophenol.

frontiers in chemistry

Synthesis, Crystal Structures and Photoluminescent Properties of One-Dimensional Europium(III)- and Terbium(III)-Glutarate Coordination Polymers, and Their Applications for the Sensing of Fe3+ and Nitroaromatics