Ultrasonic-Driven Coordination Polymer Based on the Building Block [CuI (CN)4]3− and Heptane-1,7-diamine as a Luminescence Sensor and Efficient Catalyst for Pharmaceutical Wastewater Treatment

The coordination polymer {[Cu₆(CN)₆]·HPD}_n, CP1; (HPD = heptane-1,7-diamine) was prepared and characterized by single-crystal and powder X-ray diffraction, UV–Vis spectroscopy, electron microscopy (TEM and SEM), and elemental analyses. The copper atoms are coordinated by C ≡ N ligands, and both exhibit tetrahedral geometry. Cu1 and Cu2 create the pretty unique cluster structure of two quadruple [Cu₂(μ³-CN)₂] units exhibiting coprophilic interaction. The building blocks [Cu₃(CN)₃]₂ form fused distorted rectangular rings surrounded with the [Cu₂(μ³-CN)₂] motifs exhibiting wide voids to accommodate the guest HPD. The structure of 1 indicates the formation of channels with dimensions 5.121–8.469 Ǻ which extend three-dimensionally creating fused cavity morphology with different shapes. CP1 was utilized as an efficient sensor for selective quantitative estimation of metal ions (Co²⁺) and explosives (NB). Advanced oxidation process (AOP) was used as an efficient photocatalyst for the removal of the antibiotic meloxicam (MEL) utilizing AOP in the presence of H₂O₂ as an oxidant. Scavenge experiments, reusability of catalyst 1, and mechanism of oxidation were also discussed.