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Inclusion complexation abilities of cucurbit[6]uril for various aromatic amines in the presence of alkali metal cations

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Abstract

The inclusion complexation of aromatic amines with cucurbit[6]uril (CB[6]) capped with alkali metal cations was studied spectrophotometrically. We showed that CB[6] capped with alkali metal cations forms a 1:1 inclusion complex with the aromatic amine guests (neutral organic molecules), independent of the length of guest molecules. The effects of salts on the inclusion constants of CB[6] in the presence of different alkali salts were examined and it was found that the inclusion constants increased in the order of alkali cation Cs+ < Na+ < K+, suggesting the interaction of amine guests with the capped alkali metal cation. Further, the structures of the inclusion complexation of aromatic amines with CB[6] were characterized by 1H NMR measurements. Based on the results, the inclusion abilities of CB[6] capped with alkali metal cations are discussed.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama, 700-8530, Japan

    Yusaku Honda, Tadashi Hanaya & Yoshimi Sueishi

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  1. Yusaku Honda
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  2. Tadashi Hanaya
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  3. Yoshimi Sueishi
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Correspondence to Yoshimi Sueishi.

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Honda, Y., Hanaya, T. & Sueishi, Y. Inclusion complexation abilities of cucurbit[6]uril for various aromatic amines in the presence of alkali metal cations. J Incl Phenom Macrocycl Chem 88, 253–257 (2017). https://doi.org/10.1007/s10847-017-0727-3

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  • DOI: https://doi.org/10.1007/s10847-017-0727-3

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