Document Details
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Document Type |
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Thesis |
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Document Title |
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Characterization and Thermal Kinetic Studies on Some Substituted 4,4'-bipyridylium Charge Transfer Compounds وصف و دراسات حركيه حراريه على بعض مركبات انتقال الشحنة لمستبدلات4,4‘- الباي بيريديليوم |
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Subject |
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Faculty of Sciences |
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Document Language |
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Arabic |
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Abstract |
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4,4'-Bipyridine belong to an important class of compounds with wide application in different fields and since the formation of charge transfer compounds give opportunity to improve the physical and chemical properties of different donors, so charge transfer compounds of 4,4'-bipyridine and its N,N'-di-alkyl derivatives with 2,3-dichloro-5,6 -dicyano-1,4-benzoquinone(DDQ) , 2,5-dichloro-3,6-dihydroxy-1,4- benzoquinone [chloranilic acid] (CHA) and 2,3,5,6-tetrachloro-1,4-benzoquinone [choloranil](CHL) were studied. The stoichiometries of the reactions were determined from Job’s method of continuous variations. Although the thermodynamic parameters (Gibbs free energy (ΔG°), enthalpy (ΔH°), and entropy change (ΔS°)), rate constant (k), activation energy (Ea) were calculated. The thermal kinetic studies of these compounds performed to examine the degree of the stability. The kinetics of the non-isothermal decomposition in air were studied using thermogravimetric techniques. Analyses of the kinetic data were performed using integral methods due to composite, Coats-Redfern and Ozawa methods. The results of the kinetic analysis of the non-isothermal data were discussed in view of various solid state reaction models. The results showed that the solid state reaction model which gives the best fit of data depend on the type of the acceptors as well as the type of the donors. The activation parameters were calculated and discussed for each decomposition step. The structural morphology was investigated by scanning electron microscopy (SEM) and Transmission Electron Microscopy (TEM) and show that these molecules are of nanosize. |
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Supervisor |
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Prof. Abdullah Obied |
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Thesis Type |
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Doctorate Thesis |
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Publishing Year |
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1431 AH
2010 AD |
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Added Date |
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Tuesday, August 17, 2010 |
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Researchers
| ليلى محمد الحربي | Al- Harbi, Laila Mohamed | Researcher | Doctorate | |
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