Abstract
Synthesis of zinc(II)/cadmium(II)/mercury(II) thiocyanate and azide complexes of a new bidentate Schiff-base ligand (L) with general formula of MLX2(M = Zn(II), Cd(II), and Hg(II)) in ethanol solution at room temperature is reported. The ligand and metal complexes were characterized by using ultraviolet-visible (UV-visible), Fourier transform infrared (FT-IR),1H- and13C-NMR spectroscopy and physical characterization, CHN analysis, and molar conductivity.1H- and13C-NMR spectra have been studied in DMSO-d6. The reasonable shifts of FT-IR and NMR spectral signals of the complexes with respect to the free ligand confirm well coordination of Schiff-base ligand and anions in an inner sphere coordination space. The conductivity measurements as well as spectral data indicated that the complexes are nonelectrolyte. Theoretical optimization on the structure of ligand and its complexes was performed at the Becke’s three-parameter hybrid functional (B3) with the nonlocal correlation of Lee-Yang-Parr (LYP) level of theory with double-zeta valence (LANL2DZ) basis set using GAUSSIAN 03 suite of program, and then some theoretical structural parameters such as bond lengths, bond angles, and torsion angles were obtained. Finally, electrochemical behavior of ligand and its complexes was investigated. Cyclic voltammograms of metal complexes showed considerable changes with respect to free ligand.
Highlights
Schiff bases are very important class of ligands in coordination chemistry due to the wide applications of them in synthesis of a large variety of transition-metal complexes with various structural architectures [1,2,3,4,5]. ese ligands are o en prepared in suitable yields and purity during direct reaction between aldehyde or ketone and primary aromatic and/or aliphatic amines
In analytical chemistry point of view, we reported the utility of zinc, cadmium, and mercury Schiff-base complexes for construction of some ion selective electrodes [30, 31]. is variety of possible applications of IIB metal complexes especially with various Schiff-base ligands and geometries conducted us to develop the synthesis of new coordination compound of zinc group
As a part of our continuing studies on symmetric bidentate Schiff bases including N-atom donors and their IIB metal ions complexes [30,31,32,33,34,35,36,37] and due to the importance of Zn Cd and Hg complexes in chemistry and biochemistry as mentioned above, our aim is the synthesis and characterization of new zinc(II), cadmium(II), and mercury complexes of a novel N2-Schiff-base ligand; N,N′-bis((E)-3(2-nitrophenyl)allylidene)propane-1,3-diamine. en, theoretical modeling and electrochemical behavior of the ligand and its new complexes are described with respect to each other
Summary
Schiff bases are very important class of ligands in coordination chemistry due to the wide applications of them in synthesis of a large variety of transition-metal complexes with various structural architectures [1,2,3,4,5]. ese ligands are o en prepared in suitable yields and purity during direct reaction between aldehyde or ketone and primary aromatic and/or aliphatic amines. Is variety of possible applications of IIB metal complexes especially with various Schiff-base ligands and geometries conducted us to develop the synthesis of new coordination compound of zinc group. As a part of our continuing studies on symmetric bidentate Schiff bases including N-atom donors and their IIB metal ions complexes [30,31,32,33,34,35,36,37] and due to the importance of Zn Cd and Hg complexes in chemistry and biochemistry as mentioned above, our aim is the synthesis and characterization of new zinc(II), cadmium(II), and mercury complexes of a novel N2-Schiff-base ligand; N,N′-bis((E)-3(2-nitrophenyl)allylidene)propane-1,3-diamine. As a part of our continuing studies on symmetric bidentate Schiff bases including N-atom donors and their IIB metal ions complexes [30,31,32,33,34,35,36,37] and due to the importance of Zn Cd and Hg complexes in chemistry and biochemistry as mentioned above, our aim is the synthesis and characterization of new zinc(II), cadmium(II), and mercury complexes of a novel N2-Schiff-base ligand; N,N′-bis((E)-3(2-nitrophenyl)allylidene)propane-1,3-diamine. en, theoretical modeling and electrochemical behavior of the ligand and its new complexes are described with respect to each other
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