Two CdII-containing coordination polymers based on trinuclear and dodecanuclear clusters

•Two new CdII-containing coordination polymers have been synthesized based on carboxylic anions and semi-flexible ligands.•Two of them show fascinating topological frameworks based on trinuclear and dodecanuclear cadmium clusters respectively.•The luminescent properties for the two compounds were investigated.

Two new metal-organic coordination polymers, namely, [Cd3(Tipa)2(1,2,3-btc)2]·2H2O·0.5(C2H5OH) (1) and [Cd6(Tipa)2(1,2,3-btc)4(H2O)3]·3H2O (2), where 1,2,3-btc = benzene-1,2,3-tricarboxylic anion and Tipa = tris(4-(1H-imidazol-1-yl)phenyl)amine, have been synthesized under hydrothermal conditions with Cd(AcO)2, CdCl2 or CdSO4. Single-crystal X-ray structure analysis reveals that compounds 1–2 show different three dimensional (3D) frameworks based on trinuclear and dodecanuclear cadmium clusters, respectively. For compound 1, the Tipa ligands bridge the trinuclear cadmium clusters in bi-dentate and tri-monodentate modes to give a 3D (3,6)-connected framework with the short Schläfli symbol of (62·4)(612·43). For compound 2, all Tipa and 1,2,3-btc ligands connected dodecanuclear cadmium clusters to generate a rare 3D uninodal ten-connected topology with the short Schläfli symbol of 312·428·55. Moreover, the infrared spectra, elemental analyses, thermogravimetric analysis, and luminescent properties for the two compounds were also investigated.

Graphical abstractTwo coordination polymers with fascinating topologies based on semi-flexible tris(4-(1H-imidazol-1-yl)phenyl)amine ligand and benzene-1,2,3-tricarboxylic anion have been prepared by varying the cadmium salts, where the photoluminescent behaviors for the compounds were also investigated.Figure optionsDownload full-size imageDownload as PowerPoint slide