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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 20, Number 5
JKCSEZ 20(5)
October 20, 1976 

The Behavior of Solutes in Non-Aqueous Solvents (Ⅰ). The Apparent Molal Volumes of Urea, 1,3-Dimethylurea and 1,1,3,3-tetramethylurea

물아닌 용매에서의 용질의 행동의 관한 연구 (제1보). 요소, 1,3-디메틸요소 및 1,1,3,3,-테트라메틸 요소의 겉보기 몰랄부피
Si-Joong Kim, Yeong-Kook Shin, Chang-Ju Yoon

김시중, 신영국, 윤창주
요소, 1,3-디메틸요소(DMU)및 1,1,3,3-테트라메틸요소(TMU)의 25℃에서의 겉보기 몰랄부피를 dimethylsulfoxide와 메탄올용액에서 밀도측정으로 얻었다. Dimethylsulfoxide에서 요소는 특히 묽은 용액에서 자체회합성을 보이고, DMU와 TMU는 용질-용매상호작용을 함을 알았다. 한편, 양성자성 용매인 메탄올에서 위의 3가지 용질분자는 모두 용질-용매상호작용을 우세하게 일으키고 있음을 알았다.

Apparent molal volumes of urea, 1,3-dimethylurea (DMU), and 1,1,3,3-tetramethylurea(TMU) in dimethylsulfoxide(DMSO) and in methanol have been measured at low concentration by the density measurements at 25℃. It is confirmed that urea molecules in the dilute DMSO solution self-associate to a greater extent than in the concentrated solution, while DMU and TMU molecules in DMSO solutions interact with the solvent molecules. In addition, the molecules of the three solutes also interact predominatingly with methanol molecules.

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