Assembly of two Cu-based coordination polymers from 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylate ligand

•Two coordination polymers constructed from imidazole-based dicarboxylate ligands containing pyridyl group•Compound 1 exhibits a 3D framework formed by the corner-sharing 1D chains.•Compound 2 presents a 3D supramolecular structure via π–π and hydrogen-bonding interactions.

Two novel Cu-based coordination polymers [Cu5(HPyImDC)4]·(NH4)3 (1) and [Cu3(H2O)2(HPyImDC)2(C3N2H10)] (2) containing the 2-(pyridine-3-yl)-1H-4,5-imidazoledicarboxylate (H3PyImDC) ligand have been solvothermally synthesized. Single crystal X-ray diffraction analysis reveals that compound 1 exhibits a three dimensional framework with 1D rhombic channels, which can be simplified into a novel (3, 4)-connected network with Schläfli symbol of (62.144)(62.8)4. Compound 2 is one dimensional chain which packed with each other via π–π and hydrogen-bonding interactions to construct a three dimensional supramolecular structure. As the first example related to Cu (I) and Cu (I, II) coordination polymers based on H3PyImDC ligands, compounds 1 and 2 are further studied by elemental analyses, IR spectroscopy and thermogravimetric analyses.

Graphical abstractStructural views of the two coordination polymers [Cu5(HPyImDC)4·(NH4)3] (1) and [Cu3(H2O)2(HPyImDC)2(C3N2H10)] (2). Compounds 1 and 2 as the first example related to Cu (I) and Cu (I, II) coordination polymers based on H3PyImDC ligands are both constructed from 1D rhombic chains. Compound 1 exhibits a three dimensional framework, and compound 2 is constructed by 1D chains via hydrogen-bonding interactions to form 3D supramolecular structure.Figure optionsDownload full-size imageDownload as PowerPoint slide