Synthesis, Spectroscopic Studies, Crystal Structure and Electrochemical Properties of New Cobalt(III) Complex Derived from 2-Aminophenol and 4-(Dimethylamino)Cinnamaldehyde: Nano-Sized Complex Thin Film Formation via Surface Layer-by-Layer Chemical Deposition Method |
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Authors: | Mohammad Hossein Habibi Elahe Shojaee Yuki Yamane Takayoshi Suzuki |
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Affiliation: | (1) Nanotechnology Laboratory, Department of Chemistry, University of Isfahan, Isfahan, 81746-73441, Islamic Republic of Iran;(2) Department of Chemistry, Faculty of Science, Okayama University, Tsushima-naka 3-1-1, Okayama 700-8530, Japan |
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Abstract: | New Schiff base (HL) ligand is prepared via condensation of 2-aminophenol and 4-(dimethylamino) cinnamaldehyde. The cobalt
complex with the formula of Co(L)2(MePy)2]PF6 is prepared in good yield from the reaction of the ligand with cobalt(II) acetate. The compounds were characterized by the
analytical and spectroscopic methods. The ligand (HL) behaves as a bidentate ligand and coordinates to the cobalt ions via
the nitrogen and oxygen atoms with mononuclear structure. The ligand (HL) has been structurally characterized by X-ray crystallography.
There is O–H···N–H bond linking the molecules together. FT-IR spectra show that HL is coordinated to the cobalt ion in a mono-negative
bidentate manner with ON donor sites of the azomethene N and deprotonated phenolic-OH. There are two methylpyridine molecules
apically coordinated to Co(III) ion in octahedral environment. Electrochemical properties were investigated as metal centres
in the dimethylformamide solvents. The Co(III) complex exhibit both irreversible reductive (CoIII/CoII; Epc, −1.24 V) and
oxidative (CoII/CoIII; Epa, +0.79 V, respectively) responses in cyclic voltammetry. Thin film of nano-sized M(L)2(MePy)2]PF6 complex was formed by surface layer-by-layer chemical deposition method. The formation of uniform thin films of nano-crystalline
metal complex is dependent on metal and ligand concentrations. |
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