University Chemistry ›› 2016, Vol. 31 ›› Issue (10): 60-63.doi: 10.3866/PKU.DXHX201602003

• Chemistry Laboratory • Previous Articles     Next Articles

The Measurement on the Eutectic Point of Fluorene-Fluorenone Binary Mixtures

He XIE,Li-Mei YU*(),Zhan-Xian GAO*()   

  • Published:2016-11-02
  • Contact: Li-Mei YU,Zhan-Xian GAO;


We discover the eutectic state in binary mixtures of fluorene-fluorenone.The melting temperatures of the solid mixtures with different fluorene/fluorenone ratios (mol percentage) are measured by the X-4 digital display micro melting point apparatus.The least-squares method is used to analyze the relations between the melting points and the mol percentage of fluorenone in binary mixtures.The temperature and the mol percentage of fluorenone at the intersection of two fitting straight lines are the eutectic point and eutectic composition of fluorene-fluorenone binary system,respectively.The eutectic point is found to be 57.4℃,and the mol percentage of fluorenone is 61%.This test method to determine the eutectic point of solid mixtures is suitable for undergraduate chemistry laboratory teaching.

Key words: Fluorenone, Fluorene, The eutectic point, Laboratory teaching


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