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Dependence of the optical absorption and Na+ binding energies of coumarin-crown ethers on the size and attachment position of ether ring: density functional investigation

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Abstract

The crowned coumarin complexes are well known compounds for their ion recognition abilities. They undergo photophysical changes upon cation binding. On the basis of density functional theory calculations, we examined the sodium cation (Na+) binding energies of coumarin-crown ethers based on 15-Crown-5 (15 C5) and 18-Crown-6 (18 C6) as well as the optical absorptions of coumarin-crown ethers based on 12-Crown-4 (12 C4), 15 C5 and 18 C6. We explored why the attachment of crown ether ring to coumarin affects the Na+ binding energies of coumarin-crown ethers and also why the optical absorption of coumarin is modified by the crown ethers. Our study reveals that the Na+ ion binding energies of coumarin-crown ethers depend strongly on the size of the crown ether ring and also on the attachment position of the ether ring on coumarin. These factors affect the intramolecular charge transfer and overall stability of the complexes. The absorptions of the coumarin and ether ring parts of coumarin-crown ether are red shifted from those of isolated coumarin and crown ether, respectively. The red-shift of the coumarin ester group absorption is much stronger depending on the attachment position of the ether ring to coumarin. The absorption intensity of the coumarin part in coumarin-crown ethers is reduced for the benzene group absorption, but is enhanced for the ester group absorption.

In this study, the several Na+ - coumarin-crown ether coordination complexes based on 12-Crown-4, 15-Crown-5 and 18-Crown-6 were examined by the density functional theory method. The structural effects on the Na+ binding energies and optical properties were studied.

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Acknowledgments

We would like to acknowledge Prof. Dr. Mike H. Whangbo for careful reading of the manuscript

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  1. Department of Chemistry, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey

    Esra Kasapbasi & Mine Yurtsever

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  1. Esra Kasapbasi
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  2. Mine Yurtsever
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Correspondence to Mine Yurtsever.

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Kasapbasi, E., Yurtsever, M. Dependence of the optical absorption and Na+ binding energies of coumarin-crown ethers on the size and attachment position of ether ring: density functional investigation. J Mol Model 19, 173–178 (2013). https://doi.org/10.1007/s00894-012-1500-6

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  • DOI: https://doi.org/10.1007/s00894-012-1500-6

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