New diazo-containing phenolic oximes: structural characterization, computational studies, and solvent extraction of Cu(II), Ni(II), and Zn(II) ions

Authors : Muharrem KARABÖRK, Hilal KIRPIK, Koray SAYIN, Muhammet KÖSE

Pages : 197-212

View : 15 | Download : 6

Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :In the current study, four new phenolic oxime ligands insert ignore into journalissuearticles values(HL1ox-HL4ox); containing diazo groups insert ignore into journalissuearticles values(-N$=$N-); were synthesized and used for liquid-liquid extraction of heavy metal ions [Cuinsert ignore into journalissuearticles values(II);, Niinsert ignore into journalissuearticles values(II);, and Zninsert ignore into journalissuearticles values(II);]. The new compounds were characterized by analytical and spectroscopic methods. Solid-state structures of HL1ox-HL3ox were determined by single-crystal X-ray diffraction studies. Hirshfeld surface analysis of the compounds was performed to determine the contribution of different intermolecular contacts to the stability of the structures. The HL1ox-HL4ox ligands showed higher extraction performance for Cuinsert ignore into journalissuearticles values(II); ion than Niinsert ignore into journalissuearticles values(II); and Zninsert ignore into journalissuearticles values(II); ions. The effect of pH on extraction capacity was investigated and the oxime compounds showed high extraction capacity at low pH values. The effects of the substitute groups insert ignore into journalissuearticles values(at the meta position of the phenol ring); on the extraction were investigated. Within the oxime ligands, the HL3ox compound exhibited higher extraction capacity for Cuinsert ignore into journalissuearticles values(II); ions. The better extraction value of HL3ox is attributed to the weak hydrogen bond type interactions, which result in more stable complexes.
Keywords : Solvent extraction, Cu II, ion, phenolic oxime, computational studies