Synthesis, characterization and corrosion inhibition property of nickel(II) and copper(II) complexes with some acylhydrazine Schiff bases. (29th March 2015)

• Record Type: Journal Article
• Authors: Mishra, Monika; Tiwari, Karishma; Mourya, Punita; Singh, M.M.; Singh, Vinod P.
• Is Part Of: Polyhedron. Volume 89(2015)
• Page Start: 29
• Page End: 38
• Publication Date: 2015-03-29
• Subjects: Transition metal complexes -- Schiff base -- Acylhydrazines -- Single crystal X-ray diffraction study -- DFT -- Corrosion inhibition; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2015.01.003
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Ni(II) and Cu(II) complexes of 2-amino-benzoic acid (1-phenyl-propylidene)-hydrazide and 2-hydroxy-benzoic acid (1-phenyl-propylidene)-hydrazide have been synthesized and characterized by spectral and X-ray diffraction techniques. The corrosion-inhibition efficiency of the compounds are analysed for mild steel in 0.5 M H2 SO4 medium. Abstract: Ni(II) and Cu(II) complexes with 2-amino-benzoic acid (1-phenyl-propylidene)-hydrazide (Habh) and 2-hydroxy-benzoic acid (1-phenyl-propylidene)-hydrazide (Hhbh) have been synthesized and characterized by different physico-chemical and spectroscopic techniques (UV–Vis, IR & NMR). The molecular structures of the ligands and their complexes [Ni(abh)2 (DMSO)2 ], [Ni(hbh)2 (DMSO)2 ] and [Cu(abh)2 ] have also been determined by single crystal X-ray diffraction technique. In all the complexes, each ligand coordinates to metal through azomethine-N and carbonylate-O resulting a 4-coordinate distorted square planar geometry for Cu(II) complexes and 6-coordinate distorted octahedral geometry for Ni(II) complexes in which two DMSO molecules occupy the axial positions. The structure of [Cu(hbh)2 ] complex has been satisfactorily modeled by density functional theory (DFT) and time dependent-DFT (TD-DFT) calculations. The corrosion inhibition study of the synthesized compounds has also been performed for mild steel in 0.5 M H2 SO4 medium. The activity is found in the order: Ni(II) complexes > ligands > Cu(II) complexes. The DFT study on ligands also supports the experimental observation that Habh is better corrosion inhibitor than Hhbh.