Spectroscopic studies and thermal decomposition for (bis-((E)-2-(4-ethylphenylimino)-1,2-diphenylethanone) Schiff base and its Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes prepared by direct and template reactions

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• 作者：Sanaa M. Emam ; Saeyda A. AbouEl-Enein…
• 关键词：Benzil ; Schiff base ; Spectral methods ; Thermal studies
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：127
• 期：2
• 页码：1611-1630
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
• 出版者：Springer Netherlands
• ISSN：1588-2926
• 卷排序：127

文摘

A new Schiff base (bis-((E)-2-(4-ethylphenylimino)-1,2-diphenylethanone) containing four active coordination centers (ONNO) and its metal complexes have been synthesized and characterized by elemental analyses, spectroscopic methods, molar conductance, thermal and magnetic measurements. The tetrahedral and square planar trinuclear Co(II), Ni(II) and Cu(II) complexes (1–3), respectively, have been prepared by direct reaction, while the template reaction gives octahedral complexes (4–8) with different stoichiometries 3:1, 2:1, 1:1 (M:L). The ESR spectra of solid copper (II) complexes in powder form showed an axial symmetry with 2B_1g as a ground state. The thermal decomposition mechanisms of metal complexes were studied. All the thermal decomposition processes ended with the formation of metal oxide. The thermal study showed that the complexes with different solvents of crystallization exercise different types of interaction. The kinetic and thermodynamic parameters have been calculated.