Two new three-dimensional (3,4)-connected lanthanide (III) coordination polymers based on 2-(3-Pyridyl)-1H-imidazole-4, 5-dicarboxylate: Structures and luminescent properties

•Two Ln(III) coordination polymers based on H3PyIDC were successfully synthesized.•Compound 1 displays 3D frameworks with new (3,4)-connected topology.•Compound 2 exhibits a rare (3,4)-connected dmc topology.

Two new lanthanide (III) coordination polymers, namely, {[Eu3(μ3-HPyIDC)4]·Cl}n, (1) and {[Tb2(μ3-HPyIDC)2(μ2-Ox) (H2O)2]·4H2O}n (2) (H3PyIDC = 2-(3-Pyridyl)-1H-4, 5-imidazoledicarboxylic acid; Ox = oxalate), were successfully synthesized under hydro(solvo)thermal conditions and structurally characterized. Compound 1 displays a 3D framework with new (3,4)-connected {4.8.10}4{4.84.12}2{42.84} topology built by 3-connected μ3-HPyIDC− nodes and 4-connected metal ions. Compound 2 exhibits a rare (3,4)-connected dmc topology, in which μ3-HPyIDC− anions are 3-connected nodes and metal ions are 4-connected nodes. Moreover, the thermal stabilities and luminescence of compounds 1–2 were also investigated.

Graphical abstractTwo novel three-dimensional Ln(III) coordination frameworks with (3,4)-connected topologies based on H3PyIDC with/without ox auxiliary ligands were successfully obtained.Figure optionsDownload full-size imageDownload as PowerPoint slide