Synthesis, and characterization of cobalt(III) complexes with Schiff bases derived from 2-hydroxynaphthaldehyde, (naph)2dien and (naph)2dpt, and monodentate amine ligands: Crystal structure, spectral and redox properties |
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Authors: | Mehdi Amirnasr Farzaneh Fadaee |
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Institution: | a Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran b Faculty of Chemistry, Vienna University of Technology, Getreidemarkt 9/164SC, A-1060 Vienna, Austria |
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Abstract: | Two series of complexes of the type CoIII{(naph)2dien}(amine)]BPh4 {(naph)2dien = bis-(2-hydroxy-1-naphthaldimine)-N-diethylenetriamine dianion, and amine = piperidine (pprdn) (1), pyrrolidine (prldn) (2), pyridine (py) (3), N-methylimidazole (N-MeIm) (4)}, and CoIII{(naph)2dpt}(amine)]BPh4 {(naph)2dpt = bis-(2-hydroxy-1-naphthaldimine)-N-dipropylenetriamine dianion, and amine = piperidine (pprdn) (5), 3-methylpyridine (3-Mepy) (6)} have been synthesized and characterized by elemental analyses, IR, UV-Vis, and 1H NMR spectroscopy. The crystal structures of (2) and (6) have been determined by X-ray diffraction. The redox potentials of the central cobalt ion show a relatively good correlation with the σ-donor ability of the axial ligands. The spectroscopic and electrochemical properties of these complexes are also influenced by the mutual steric hindrance between the pentadentate Schiff base and the ancillary ligands. |
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Keywords: | Cobalt(III) complexes Pentadentate Schiff base ligand Cyclic voltammetry X-ray crystal structure |
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