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A characteristic effect of pressure on inclusion complexation of phenothiazine dyes with p-sulfonatocalix[6]arene in a room-temperature ionic liquid

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Abstract

The inclusion complexation of p-sulfonatocalix[6]arene (Calix-S6) with three kinds of phenothiazine dyes was studied spectrophotometrically in a mixture of a room-temperature ionic liquid [bmim]BF4 (1-butyl-3-methylimidazolium tetrafluoroborate) and ethanol. We have determined the association constants of Calix-S6 with phenothiazine dyes under external static pressure up to 767 bar in the [bmim]BF4-ethanol and alcohol-water mixtures. With increasing external pressure, the inclusion equilibrium in the alcohol-water mixtures was shifted to the dissociation side. Conversely, the inclusion equilibrium of methylene blue (MB) and azure A (AA) in the ionic liquid mixture was shifted to the association side. From the analysis of the pressure effects, the reaction volumes ΔV for inclusion complexation were estimated as −7 to 9 cm3 mol−1 in the [bmim]BF4-ethanol mixture and 20–32 cm3 mol−1 in the alcohol-water mixtures. Based on the results, we have suggested that there is a competing complexation between the included dye and [bmim]BF4 molecules in the ionic liquid.

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Authors and Affiliations

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

    Naoya Inazumi, Shunzo Yamamoto & Yoshimi Sueishi

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  1. Naoya Inazumi
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  2. Shunzo Yamamoto
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  3. Yoshimi Sueishi
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Correspondence to Yoshimi Sueishi.

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Inazumi, N., Yamamoto, S. & Sueishi, Y. A characteristic effect of pressure on inclusion complexation of phenothiazine dyes with p-sulfonatocalix[6]arene in a room-temperature ionic liquid. J Incl Phenom Macrocycl Chem 59, 33–39 (2007). https://doi.org/10.1007/s10847-007-9291-6

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  • DOI: https://doi.org/10.1007/s10847-007-9291-6

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