CRCU

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (1): 123-126.

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Heterotactic Enthalpic Interactions of L-Arginine with 2,2,2-Trifluoroethanol in Aqueous Solutions at 298.15, 303.15 and 310.15 K

ZHU Yan1*, PANG Xian-hong1 and YU Li2   

  1. 1. Department of Chemistry and Chemical Engineering, Taishan Medical University, Tai’an 271016, P. R. China;
    2. Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, P. R. China
  • Received:2010-02-19 Revised:2010-06-12 Online:2011-01-25 Published:2011-01-04
  • Contact: ZHU Yan E-mail:2004zy428@163.com
  • Supported by:

    Supported by the Natural Scientific Foundation of Shandong Province, China(No.Z2007B03) and the Doctoral Fund of the Ministry of Education of China(New Teachers Fund)(No.070422047).

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Abstract: The enthalpies of mixing of L-arginine with 2,2,2-trifluoroethanol and their respective enthalpies of dilution in aqueous solutions at 298.15, 303.15 and 310.15 K were determined as a function of the mole fraction by flow microcalorimetric measurement. These experimental results were analyzed to obtain heterotactic enthalpic interaction coefficients(hxy, hxxy, hxyy) according to the McMillan-Mayer theory. The hxy coefficients between L-arginine molecule studied and 2,2,2-trifluoroethanol molecule in aqueous solutions at 298.15, 303.15 and 310.15 K were found to be all negative. The results were discussed in terms of solute-solute interaction and solute-solvent interaction.

Key words: L-Arginine, 2,2,2-Trifluoroethanol, Solute-solute interaction, Heterotactic enthalpic interaction