Solid state decomposition studies on metal salicylates: Kinetics of iso-thermal dehydration of some transition metal salicylato complexes |
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| Affiliation: | 1. Department of Chemistry, College of Science and Humanities in Al-Kharj, Prince Sattam Bin Abdulaziz University, Al-kharj 11942, Saudi Arabia;2. Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia;3. Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand;1. Department of Chemistry, Sultan Qaboos University, P.O. Box 36, Al Khod 123, Oman;2. Department of Fundamental Sciences, Faculty of Engineering, Samsun University, Samsun, Turkey;3. Department of Physics, Faculty of Arts and Sciences, Ondokuz Mayıs University, Samsun, Turkey;1. Department of Chemistry, College of Science, Mustansiriya University, P.O. Box 46010, Baghdad, Iraq;2. Department of Chemistry, Faculty of Science, Ondokuz Mayıs University, 55139 Samsun, Turkey;3. Department of Physics, Faculty of Science, Ondokuz Mayıs University, 55139 Samsun, Turkey;4. Laboratory of Material Sciences and Environment, Faculty of Science of Sfax, University of Sfax, Tunisia;5. Department of Metallurgical and Materials Engineering, Faculty of Engineering, Ondokuz Mayis University,Samsun 55139, Turkey;6. Narcotic Research Department, National Center for Social and Criminological Research (NCSCR), Giza 11561, Egypt |
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| Abstract: | The dehydration of cadmium(II ) , copper(II), manganese(II), nickel(II) and zinc(II) salicylato complexes were investigated by means of isothermal TG measurements. The Cd, Mn and Zn complexes were dihydrates. Ni complex was a tetrahydrate while Cu formed both dihydrate and tetrahydrate complexes. Thermal decomposition of the studied complexes synthesized using a pure salicylic acid as a ligand occurs in three stages, the oxides finally being formed. The first step being associated to the dehydration of the complexes obeys a phase boundary reaction mechanism. The ΔH values for hydration of Cd, Cu, Mn and Zn dihydrate complexes are 116.5, 76.0, 86.8, 113.3 kJ mol−1 and for Cu and Ni tetrahydrates 117.1 and 108.9 kJ mol−1, respectively. |
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