The [CuI4Cl4] cluster of a coordination complex based on polypyridyl ligand for heterogeneous Fenton-like MB degradation without illumination and electrocatalytic reduction of H2O2 and K2Cr2O7

Abstract

Developing novel materials for elimination of organic pollutants in wastewater has become one of the most imperious demands for human environment. Herein, a [CuI4Cl4]-containing complex [Cu4(DNP)Cl4)] (1) (DNP = 2,6-di(1,8-naphthyridine-2-yl)pyridine) based on π-conjugated polypyridyl ligand has been solvothermally synthesized, exhibiting a three-dimensional structure via C–H⋯Cl hydrogen bonds and π···π interactions between pyridine rings. Complex 1 displays good Fenton-like degradation efficiency toward methylene blue (MB) with the rate of 71.9% in 120 min under dark condition, in which the interactions between CuI centers and DNP are of extraordinary importance for enhanced degradation efficiency. The degradation products are identified by liquid chromatography-mass spectrometry (LC-MS) and two MB degradation pathways have been proposed. In addition, complex 1 demonstrates good electrocatalytic activity for reduction of H2O2 and K2Cr2O7 via redox of CuII/CuI. This work presents an effective strategy for the rational design of coordination complexes for Fenton-like catalysis and electrocatalytic reduction.