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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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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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Acknowledgments

Support from Yarmouk University and Research Institute of King Fahd University of Petroleum and Minerals (KFUPM) are gratefully acknowledged. Special thanks are due to Professor Dr. A. Suwayan from department of chemistry (KFUPM) and Dr. Yaser A. Yousef from Yarmouk University for useful suggestions. The data presented were collected during the research visit of the author at KFUPM.

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  1. Department of Chemistry, Faculty of Science, Yarmouk University, 21163, Irbid, Jordan

    Khader A. Al-Hassan

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  1. Khader A. Al-Hassan
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Correspondence to Khader A. Al-Hassan.

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Al-Hassan, K.A. 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. J Fluoresc 23, 1197–1206 (2013). https://doi.org/10.1007/s10895-013-1250-6

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  • DOI: https://doi.org/10.1007/s10895-013-1250-6

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