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标题：Application of Differential Scanning Calorimetry in an Organic Chemistry Laboratory Course: Development of a Binary Phase Diagram of Cis/Trans-1, 2-Dibenzoylethylene
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作者：Ronald P. D’Amelia ; Brett Johnson ; Shivnath Mazumder 等
期刊名称：World Journal of Chemical Education
印刷版ISSN：2375-1665
电子版ISSN：2375-1657
出版年度：2017
卷号：5
期号：2
页码：46-52
DOI：10.12691/wjce-5-2-4
出版社：Science and Education Publishing
摘要：In organic chemistry lab it is important to give students hands-on experiences to help them further their understanding of important chemistry topics. Binary phase diagrams incorporate many of these topics into a single graph. Differential Scanning Calorimetry (DSC) has been shown to produce data to make binary phase diagrams for alloys; however, it is more difficult to produce these diagrams using non-metal organic compounds. The purpose of this experiment was to determine if the DSC could be used to give students a challenging, yet doable experiment to prepare a binary phase diagram and determine the eutectic composition for the mixture of cis/trans-1,2-dibenzoylethylene. The conclusions from this work are: (i) The eutectic composition for cis/trans-1,2-dibenzoylethylene is at the weight percent of 30% cis and 70% trans which corresponds to an onset melting temperature of 93.5°C; (ii) as the cis increased from a weight percent of 30% the melt temperature also increased; (iii) as the trans increased from a weight percent of 70% the melt temperature also increased; (iii) the DSC produced sufficient data necessary to develop a binary phase diagram of peak melt temperatures vs the weight percent of the cis isomer; (iv) the DSC could be incorporated into an organic chemistry lab to enhance student’s knowledge of important topics while giving them an experience working with advanced laboratory thermal instruments.
关键词：upper-division undergraduate; laboratory instruction; organic chemistry; hands-on learning; instrumental methods; phases diagrams; eutectic; cis/trans 1;2 dibenzoylethylene; Differential Scanning Calorimetry