Abstract
Self-assembled fluorinated oligomeric aggregates formed by fluoroalkyl end-capped N-(1,1-dimethyl-3-oxobutyl)acrylamide oligomers, N,N-dimethylacrylamide oligomers, and acrylic acid oligomers in methanol could recognize selectively fluoresceins as guest molecules to form a new class of fluorinated aggregates/fluoresceins nanocomposites. These fluorinated fluoresceins nanocomposites were found to exhibit an extraordinarily enhanced light absorption (λmax: ca. 440 nm) compared to that (λmaxs: 452 and 480 nm) of the parent fluorescein in the absence of fluorinated aggregates. On the other hand, fluoroalkyl end-capped 2-carboxyethyl acrylate oligomers, which possess no aggregate characteristic in methanol solutions, could not afford such an enhanced light absorption peak under similar conditions. Not only fluorescein but also fluorescein derivatives such fluoresceinamine, carboxyfluorescein, and fluorescein isothiocyanate afforded similar enhanced narrow absorption peaks under similar conditions. Naphthofluorescein was also encapsulated into these fluorinated oligomeric aggregate cores to afford fluorinated aggregates/naphthofluorescein composites, and these fluorinated naphthofluorescein composites afforded an extremely enhanced narrow absorption peak around 520 nm.
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Acknowledgements
Thanks are due to Kohjin Co., Ltd. and Kyowa Hakko Kogyou Co., Ltd. for supply of DMAA and DOBAA, respectively. The authors also thank Dr. T. Saitoh of Waseda Junior and Senior High School (Tokyo, Japan) for helpful discussion on the ZINDO molecular orbital theoretical studies.
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Sasazawa, K., Yamada, Y. & Sawada, H. Preparation and properties of fluoroalkyl end-capped oligomer/fluoresceins nanocomposites. J Mater Sci 43, 1366–1375 (2008). https://doi.org/10.1007/s10853-007-2288-0
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DOI: https://doi.org/10.1007/s10853-007-2288-0