کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694048 | 1459638 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Water-mediated interactions between benzene rings
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Pairwise enthalpic interaction coefficients of the virial expansion of the excess enthalpies were determined at 298Â K by measuring the enthalpies of dilution in aqueous solution of binary aqueous solutions containing 4-hydroxyphenylacetic acid, 2-phenylethanol, 3-phenylpropanol, 3-phenylpropionic acid, l-tyrosine and l-phenylalanine. Coefficients obtained are compared with those already reported in the literature for other aromatic substances in aqueous solutions. Not withstanding the similarity of the substances employed, the values of the enthalpic coefficients range from highly negative to highly positive, an indication that the interactions between the benzene rings are largely dependent on the nature of the functional groups. For hydroxylated substances, enhanced hydrophobic interactions are operating, probably for the simultaneous interaction between the benzene rings and the alkyl chains, forced by the hydroxyl group. On the contrary, the strength of hydrophobic interactions in the solutions of the amino acids depend on the pH of the medium and on the presence of hydroxyl group on the aromatic ring. The data are discussed according to an interaction model which assumes the presence of a preferential configuration between two hydrated molecules.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 433, Issues 1â2, 1 August 2005, Pages 51-55
Journal: Thermochimica Acta - Volume 433, Issues 1â2, 1 August 2005, Pages 51-55
نویسندگان
Giuseppina Castronuovo, Marcella Niccoli,