Synthesis, spectral, thermal and optical properties of Schiff-base complexes derived from 2(E)-2-((z)-4-hydroxypent-3-en-2-ylideneamino)-5-guanidinopentanoic acid and acetylacetone
| Autor: | Fatima M. Radwan, Nagwa Nawar, Nasser Mohammed Hosny, Mostafa A. Hussien |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Schiff base
010405 organic chemistry Band gap Ligand Acetylacetone Organic Chemistry Inorganic chemistry 010402 general chemistry 01 natural sciences 0104 chemical sciences Analytical Chemistry Inorganic Chemistry Metal chemistry.chemical_compound Crystallography symbols.namesake chemistry visual_art Proton NMR visual_art.visual_art_medium symbols Carboxylate Raman spectroscopy Spectroscopy |
| Zdroj: | Journal of Molecular Structure. 1143:176-183 |
| ISSN: | 0022-2860 |
| DOI: | 10.1016/j.molstruc.2017.04.063 |
| Popis: | New metal complexes derived from the in situ reaction of Cu(II), Co(II), Ni(II) and Zn(II) acetates with the Schiff-base ligand (H 2 L) resulted from the condensation of 2-amino-5-guanidinopentanoic acid (arginine) and acetylacetone have been synthesized. The resulting complexes have been characterized by, elemental analyses, ES-MS, IR, Raman spectra, UV–Vis., 1 HNMR, ESR, thermal analyses (TGA and DTG) and magnetic measurements. The results showed that, The Schiff-base ligand acts as bi-negative tridentate coordinating via azomethine nitrogen, enolic carbonyl oxygen and carboxylate oxygen after displacement of hydrogen. The thermodynamic parameters E ∗ , ΔH, ΔG and ΔS of the isolated complexes have been calculated. The optical band gap (E g ) values of Cu, Co, Ni and Zn were found to be 3.3, 3.4, 3.7 and 4.3 eV, respectively, arising from direct transitions. Optical band gap measurements indicate the semi-conductivity nature of these complexes. |
| Databáze: | OpenAIRE |
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