物理化学学报 >> 1986, Vol. 2 >> Issue (04): 310-313.doi: 10.3866/PKU.WHXB19860408

研究论文 上一篇    下一篇

溶液中芳香单酮的聚集态

田珂; 侯伟星; 刘长春; 朱自强; 李铁津   

  1. 吉林大学化学系
  • 收稿日期:1985-10-28 修回日期:1986-03-24 发布日期:1986-08-15

THE AGGREGATE STATE OF AROMATIC MONOKETONES IN SOLUTION

Tian Ke; Hou Weixing; Liu Changchun; Zhu Ziqiang; Li Tiejin   

  1. Department of Chemistry, Jilin University
  • Received:1985-10-28 Revised:1986-03-24 Published:1986-08-15

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摘要： 本文对九种芳香单酮(苯乙酮、对氯苯乙酮、对甲氧基苯乙酮、对氨基苯乙酮、对硝基苯乙酮、间硝基苯乙酮、2.4-二甲基苯乙酮、1-萘乙酮和1-萘基苯基甲酮)在丙酮溶液中的吸收光谱进行了比较。发现芳香单酮在溶液中的分散是不均匀的, 随浓度增加, 有芳香单酮的聚集体生成。且芳香单酮分子的共轭体系越发达或苯环上电子云密度越犬, 分子就越易聚集。同时提出芳香单酮聚粲时的分子排列是苯环对苯环“面对面”取向的推断。

Abstract: In this paper, a comparison has been made of the absorption spectra of nine aromatic monoketones in acetone. It can be seen from our results that the dispersiveness of aromatic monoketones is inhomogeneous in solution. The equilibrium between monomers and dimers shifts to the side of the latter with increasing the concentration of monoketones. A number of factors have been suggested as promotion for the aggregation of aromatic monoketones. This red-shifted absorption was assigned by the method of Davydov-Kasha as the allowed exciton dimer transitin. Furthermore, the geometry of dimer is “face to face”.