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KMID : 1059519970410020063
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Journal of the Korean Chemical Society
1997 Volume.41 No. 2 p.63 ~ p.68
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Thermodynamic Studies on the Structure of Binary Mixed Solvents(Ⅰ). Partial Molal Enthalpies of Alcohol-Cosolvent Mixtures
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Lah Sang-Moo
Park Young-Dong
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Abstract
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Calorimetric measurements have been carried out for the binary mixture between protic, ROH (R=Me, Et) and dipolar aprotic solvents, MeCN, Me2CO, MeNO2(or EtNO2) in order to investigate the molecular interaction and liquid structure of isodielectric solvents. From the measured partial molar enthalpies of the solutions, excess enthalpies for the mixing process were determined. The hydrogen bond strength between two components decreases in the order of ROH-ROH > ROH-Me2CO > ROH-MeCN > ROH-MeNO2(or EtNO2) and the hydrogen bond donor acidity decreases in the order of MeOH > EtOH. From this result, we can conclude that the most important interaction for the formation of binary liquid mixture comes from the specific hydrogen bond.
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