Thermodynamic Studies on the Structure of Binary Mixed Solvents(Ⅰ). Partial Molal Enthalpies of Alcohol-Cosolvent Mixtures

이성분 혼합용매의 구조에 대한 열역학적 연구(제1보). 알코올-Cosolvent 혼합물의 분몰랄엔탈피

  • Nah, Sang Moo (Department of Chemistry, College of Natural Sciences, Ajou University) ;
  • Park, Young Dong (Department of Chemistry, College of Natural Sciences, Ajou University)
  • 나상무 (아주대학교 자연과학대학 화학과) ;
  • 박영동 (아주대학교 자연과학대학 화학과)
  • Published : 19970200

Abstract

Calorimetric measurements have been carried out for the binary mixture between protic, ROH (R=Me, Et) and dipolar aprotic solvents, MeCN,$Me_2CO,\;MeNO_2(or EtNO_2)$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$ROH-ROH>ROH-Me_2CO>ROH-MeCN>ROH-MeNO_2(or EtNO_2)$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.

Keywords

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