The Role of Normal Versus Twisted Intramolecular Charge Transfer Fluorescence in Predicting the Forms of Inclusion Complexes of Ethyl-4-dialkylaminobenzoate with α-Cyclodextrin in Aqueous Solution |
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Authors: | Khader A Al-Hassan |
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Institution: | 1. Department of Chemistry, Faculty of Science, Yarmouk University, 21163, Irbid, Jordan
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Abstract: | An evidence is introduced through the b- and the twisted intramolecular charge transfer (TICT) fluorescence of ethyl-4-(N,N-dimethylamino)benzoate (EDMAB) and ethyl-4-(N,N-diethylamino)benzoate (EDEAB), confirming the role of donor size on the formation and emission of various inclusion complexes formed between these probes and α-CD in aqueous solution. A large variation in the b-fluorescence band of EDEAB as compared to that of EDMAB and a large variation in the TICT-fluorescence band of EDMAB as compared to that EDEAB, as the concentration of α-CD is increased in their aqueous solutions are observed. These variations are supported by time resolved fluorescence (TRF) spectra, fluorescence decay lifetimes and red edge effect (REE) results. |
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