Comparative Studies on Adduct Compounds of Schiff-Base Donors and Some Organic and Inorganic Acceptors

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Hendinejad, Niloofar | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43278 (03)
University: Sharif University of Technology
Department: Chemistry
Advisor(s): Mohammadi Boghaei, Davar
Abstract:
The charge transfer interaction of two Schiff-bases Bis- (2-thiophene methylene)-1,4- Benzene Di amine and Bis (2-thiophene methylene)-1,3- Benzene Di amine as donors with iodine and tetracyano ethylene as Electron acceptors have been studied spectrophotometrically. The formation constants and extinction coefficients of charge transfer complexes have been determined by graphical as well as iterative methods. From measurements at different temperatures the thermodynamic functions of the charge transfer complex formation have been studied. The temperature dependence of the K can be used for the determination of the thermodynamic reaction quantities (ΔG˚, ΔS˚, ΔH˚) for linear regression fits to the vant hoff equation. in addition of UV-Vis spectrometry, we use 1HNMR,13CNMR and FTIR to investigate the synthesised Schiff-bases. The thermodynamic studies reveals that the reactions of these Schiff bases with iodine were exothermic and the entropy decreased and the values of ΔH˚ and ΔS˚ were negative. But reactions with tetracyanoethylene were endothermic and the entropy increased and the values of ΔH˚ and ΔS˚ were positive.
Keywords:
Electron Donor ; Electron Acceptor ; Charge Transfer Compounds ; Vant Hoff Equation

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