Salisaldehyde-2-aminobenzimidazole schiff base complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) |
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Authors: | Mohamed G G Abd El-Wahab Z H |
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Institution: | (1) Chemistry Department, Faculty of Science, Cairo University Giza, Egypt |
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Abstract: | New metal complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) with salicylidine-2-aminobenzimidazole (SABI) are
synthesized and their physicochemical properties are investigated using elemental and thermal analyses, IR, conductometric,
solid reflectance and magnetic susceptibility measurements. The base reacts with these metal ions to give 1:1 (Metal:SABI)
complexes; in cases of Fe(III), Co(II), Cu(II), Zn(II) and Cd(II) ions; and 1:2 (Metal:SABI) complexes; in case of Ni(II)
ion. The conductance data reveal that Fe(III) complex is 2:1 electrolyte, Co(II) is 1:2 electrolyte, Cu(II), Zn(II) and Cd(II)
complexes are 1:1 electrolytes while Ni(II) is non-electrolyte. IR spectra showed that the ligand is coordinated to the metal
ions in a terdentate mannar with O, N, N donor sites of the phenloic -OH, azomethine -N and benzimidazole -N3. Magnetic and
solid reflectance spectra are used to infer the coordinating capacity of the ligand and the geometrical structure of these
complexes. The thermal decomposition of the complexes is studied and indicates that not only the coordinated and/or crystallization
water is lost but also that the decomposition of the ligand from the complexes is necessary to interpret the successive mass
loss. Different thermodynamic activation parameters are also reported, using Coats-Redfern method.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | electronic and magnetic spectra salicylidine-2-aminobenzimidazole transition metal complexes IR anlysis thermal anlysis |
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