A dual functional Cu(ii)-coordination polymer and its rGO composite for selective solvent detection and high performance energy storage†

Abstract

Herein, the fabrication of a new Cu(II)-based coordination polymer {[Cu₂(DPP)₂(H₂O)₂]·DPP·2NO₃}_n (CP-1) (DPP = 1,3-di(4-pyridyl)propane) and its composite (rGO@CP-1) has been done using solvothermal and mechanochemical methods. The crystal structure of the synthesized CP-1 was confirmed utilizing single-crystal X-ray diffraction (SC-XRD). Furthermore, the structural features of the as-synthesized CP-1 and rGO@CP-1 were examined using PXRD, FTIR, TGA, SEM, and HR-TEM analysis. The topological framework of CP-1 shows a 1,3M4-1 underlying net for two fragments and the hydrogen-bonded network shows a 2C1 underlying net topology. The fluorescence detection of transition metal ions and solvents using CP-1 showed promising results of 97.4% DMF and 96.8% Zn²⁺. Electrochemical study of CP-1 and rGO@CP-1 was performed in an acidic medium (1 M H₂SO₄) electrolyte utilizing cyclic voltammetry (CV) and galvanostatic charge–discharge (GCD) techniques with a specific capacity of 244.17 F g⁻¹ and 899.54 F g⁻¹ for CP-1 and rGO@CP-1, respectively at 1 A g⁻¹ (current density). Moreover, 98.6% columbic efficiency with 94.62% capacity retention of rGO@CP-1 was obtained at 8 A g⁻¹ up to 2000 cycles.