Syntheses, structures and luminescent properties of two new two-fold interpenetrating 2D coordination polymers based on 4′-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine

•Two new Zn/Cd coordination polymers were constructed.•The metal ions play an important role for the construction of compounds 1 and 2.•Compounds 1 and 2 show two-fold interpenetration 2D structure.

Two new coordination polymers, [Zn2(cptpy)2Cl2]n·0.5nH2O (1) and [Cd2(cptpy)4]n·3.5nH2O (2) (Hcptpy = 4′-(4-carboxyphenyl)-4,2′:6′,4″-terpyridine), were synthesized under hydrothermal conditions and characterized by elemental analysis, IR and single crystal X-ray diffraction. Compound 1 shows a new two-fold interpenetrating 3-connected 2D framework with the hcb topological net and the Schläfli symbol of 63. Compound 2 displays a two-fold interpenetrating (4,4)-connected 2D framework with the sql topological net and the Schläfli symbol of {44 · 62}. Interestingly, compounds 1 and 2 were obtained in the similar reaction conditions. The structural diversity of compounds 1 and 2 may illustrate the marked effect of the metal ion of the reaction solution. Additionally, photoluminescence properties of compounds 1–2 have been investigated.

Graphical abstractTwo new 2-fold interpenetrating Zn/Cd coordination polymers based on a bis-functioned trigonal ligand have been synthesized by changing metal ion under hydrothermal reactions, giving topological networks those of 2D structures. The thermal stability and luminescent property have been investigated.Figure optionsDownload full-size imageDownload as PowerPoint slide