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Interactions between AuCl4 − and CTA+ ions in water

Enthalpies for the formation of the precipitate

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Abstract

The solubility of hexadecyltrimethylammonium tetrachloroaurate (CTA·AuCl4) in water was measured at different temperatures of 288.2, 293.2, 298.2, 303.2, and 308.2 K. The enthalpy change associated with the formation of the CTA·AuCl4 precipitate was estimated on the basis of the van’t Hoff equation and was found to be −42.5 ± 2.8 kJ mol−1 at 298.2 K. The calorimetric enthalpy change for the CTA·AuCl4 precipitate formation was directly determined by isothermal titration calorimetry performed at 298.2 K and was found to agree well with that estimated from the van’t Hoff equation.

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Acknowledgements

We thank Prof. M. Fukuhara, Okayama University of Science, for thermal gravimetric measurements. This study was supported by “High-Tech Research Center” Project for Private Universities: matching fund subsidy from MEXT (Ministry of Education, Culture, Sports, Science and Technology), 2006-2008.

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Authors and Affiliations

  1. Department of Applied Chemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama, 700-0005, Japan

    Makoto Takezaki & Toshihiro Tominaga

  2. Department of Biochemistry, Okayama University of Science, 1-1 Ridai-cho, Kita-ku, Okayama, 700-0005, Japan

    Hiroyuki Aoki & Michiko Kodama

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  1. Makoto Takezaki
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  2. Hiroyuki Aoki
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  3. Michiko Kodama
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  4. Toshihiro Tominaga
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Correspondence to Toshihiro Tominaga.

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Takezaki, M., Aoki, H., Kodama, M. et al. Interactions between AuCl4 − and CTA+ ions in water. J Therm Anal Calorim 101, 1149–1153 (2010). https://doi.org/10.1007/s10973-009-0659-2

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  • DOI: https://doi.org/10.1007/s10973-009-0659-2

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