Synthesis, characterization and corrosion inhibition property of nickel(II) and copper(II) complexes with some acylhydrazine Schiff bases
摘要:
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 H2SO4 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. (C) 2015 Elsevier Ltd. All rights reserved.
Synthesis, characterization and corrosion inhibition property of nickel(II) and copper(II) complexes with some acylhydrazine Schiff bases
摘要:
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 H2SO4 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. (C) 2015 Elsevier Ltd. All rights reserved.