Document Details
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Document Type |
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Thesis |
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Document Title |
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Spectroscopic Studies of some Coumarin Derivatives and some of their Transition Metal Complexes دراسات طيفية لبعض مشتقات الكومارين ومتراكباته مع بعض العناصر الانتقالية |
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Subject |
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Girls' College of Education in Jeddah |
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Document Language |
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Arabic |
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Abstract |
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The Schiff base ligands 4-methyl-7-(salicylidineamino) coumarin, HL1, N1,N2-bis[8-(1-ethylidene)-7-hydroxy-2H-chromen-2-one] ethane-1,2-diamine, H2L2, 8-{(1E)-1-[(2-aminophenyl)iminio]ethyl}-2,7-dioxo-7,8-dihydro-2H-chromen-8-ide, HL3 and (Z)-8-(1-(4-aminophenylamino) ethylidene)-2H-chromene-2,7(8H)-dione, HL4 and their M(II) transition metal complexes, [M = Zn, Cd and Cu] for HL1 and [M = Zn, Cd, Cu, Ni and Pd] for H2L2, HL3 and HL4 have been synthesized and characterized on the bases of elemental analysis, molar conductance, single- crystal X- ray diffraction study, nuclear magnetic resonance and a variety of spectral methods. The molar conductance value revealed that the chelates are nonelectrolytic in nature. IR spectra show that the Schiff base are coordinated to the metal ions via an azomethine nitrogen and phenolic oxygen while the lactone carbonyl does not participate in coordination. Other spectral studies such as NMR studies, UV/vis, mass spectra and ESR suggested the tentative structures for HL1, H2L2, HL3 and HL4 complexes.
The fluorescence studies showed that the Schiff base ligands exhibited fluorescence emission at the blue region. Upon coordination with Zn(II) and Cd(II) an enhanced fluorescence intensity was obtained. However the coordination of Cu(II), Ni(II) and Pd(II) quenched the fluorescence intensity.
Based on the research we suggest that the Schiff base ligand HL1 could be used as a potential Zn2+ sensor while HL3 could be used as a laser dye in comparison to 7-amino-4-methylcoumarin. It's zinc complex could be used as a potential Zn2+ sensor even in the presence of other ions and as a photoactive material in many applications. |
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Supervisor |
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Dr. Elham Aazam |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1430 AH
2009 AD |
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Co-Supervisor |
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Dr. Amal El-Hussieny |
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Added Date |
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Saturday, February 6, 2010 |
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Researchers
| هدى محمد العمري | Al-Amri, Huda Mohammad | Researcher | Master | |
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