Preparation, characterization and pH-metric measurements of 4-hydroxysalicylidenechitosan Schiff-base complexes of Fe(III), Co(II), Ni(II), Cu(II), Zn(II), Ru(III), Rh(III), Pd(II) and Au(III) |
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| Authors: | Anan Neveen A Hassan Shawky M Saad Eman M Butler Ian S Mostafa Sahar I |
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| Institution: | aChemistry Department, Faculty of Science, Mansoura University 35516, Mansoura, Egypt;bChemistry Department, Faculty of Science (Suez), Suez Canal University, Egypt;cDepartment of Chemistry, McGill University, Montreal QC, Canada H3A 2K6 |
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| Abstract: | The 4-hydroxysalicylidenechitosan Schiff-base (2CS-Hdhba) was prepared by the condensation of 2,4-dihydroxybenzaldehyde with chitosan, and its metal complexes, M(2CS-dhba)Cl2(H2O)2] (M(III) = Fe, Ru, Rh), M′(2CS-dhba)(AcO)(H2O)2] (M′(II) = Co, Ni, Cu, Zn), Pd(2CS-dhba)Cl(H2O)] and Au(2CS-dhba)Cl2], are reported. These complexes were characterized by elemental analysis, by spectral data (FTIR, solid-phase 13C NMR, UV–vis and ESR spectroscopy), by morphological observations (SEM and XRD), and by magnetic and thermal measurements. The Schiff base (2CS-Hdhba) behaves as a bidentate chelate with a single negative charge. The azomethine nitrogen and the deprotonated 2-hydroxy centres with the pendant glucosamine hydroxy functionality play no role in coordination. The dissociation constants of 2CS-Hdhba and the stability constants of some of its metal complexes have been determined pH-metrically. |
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| Keywords: | Chitosan Schiff base Azomethine Hydroxyl Coordination |
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