Solvent-induced copper–lanthanide heterometallic coordination polymers based on pyridine-2,3-dicarboxylic acid: Syntheses, structures, and electrochemical properties

•Six 2D 2,3-pydc-based copper–lanthanide heterometallic complexes are obtained.•The reaction solvents have an important effect on the formation of six complexes.•The electrochemical properties of six complexes are investigated.

Six copper–lanthanide heterometallic coordination polymers (CPs) [LnCu(2,3-pydc)2(HCOO)(H2O)3]·H2O [Ln = La (1), Pr (2), Nd (3), Sm (4), Eu (5), and Gd (6), 2,3-H2pydc = pyridine-2,3-dicarboxylic acid] were synthesized successfully by the reactions of 2,3-H2pydc with LnCl3·nH2O and Cu(NO3)2·3H2O under solvothermal conditions of H2O–DMF or H2O–DMF–MeOH. They were structurally characterized by single-crystal X-ray diffraction and powder X-ray diffraction (PXRD). CPs 1–6 possess isostructural 2D (4,4) layer architectures built from the dinuclear Ln2(HCOO)2 and Cu2(2,3-pydc)4 units. The reaction solvents have an important effect on the formation of 1–6. The electrochemical properties of 1–6 were investigated.

Graphical abstractSix 2D 2,3-pydc-based copper–lanthanide heterometallic coordination polymers are synthesized. Effect of reaction solvents on the formation of six coordination polymers is studied. Electrochemical properties of six coordination polymers are investigated.Figure optionsDownload full-size imageDownload as PowerPoint slide