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Iranian Journal of Chemistry and Chemical Engineering، جلد ۳۷، شماره ۵، صفحات ۴۷-۵۴
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عنوان انگلیسی Spectroscopic Study of Charge Transfer Complexes of Dibenzo-24-crown-8 (DB24C8) with Iodine in Three Chlorinated Solvents
چکیده انگلیسی مقاله Charge Transfer (CT) complexes formed between dibenzo-24-crown-8 (DB24C8) as an electron donor with the σ-electrone acceptor iodine (I2) in chloroform, dichloromethane and 1,2-dichloroethane solutions have been studied by different spectroscopic techniques at room temperature. The spectral studies of the complexes were detrmined by UV-Visible, Fourier TransForm InfraRed (FT-IR) Studies on the system showed the time dependence of absorption band of the complexes. The observed time dependence of the charge-transfer band and subsequent formation of I3¯ in solution were related to the slow transformation of the initially formed outer complex to an inner Electron Donor-Acceptor (EDA) complex, followed by fast reaction of the inner complex with iodine to form three iodide ion. Formation constants of the resulting complexes were determined by measuring the absorbance at lmax for a series of solutions with varying excess amounts donor and constant iodine concentration in solvent systems used. The reaction stoichiometry was found to be 1:1 (donor : acceptor) molar ratio for both complexation system by using photometric titration measurements. The formation constant (KCT), molar extinction coefficient (eCT), free energy change (DG0), CT-energy (ECT), calculate by usinge the Benesi-Hildebrand method. Stability of the resulting complex in three solvents was also found to vary in the order of 1,2 -DCE >DCM> CHCl3.
کلیدواژه‌های انگلیسی مقاله Charge-transfer complex, Crown ether, Iodine, Spectroscopy
نویسندگان مقاله Nina Alizadeh |
Department of Chemistry, University of Guilan, Rasht, I.R. IRAN

Zahra Amani Lavani |
Department of Chemistry, University of Guilan, Rasht, I.R. IRAN

نشانی اینترنتی http://www.ijcce.ac.ir/article_29054_48910776faf3ad427df0d7d430f1ca6f.pdf
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