Analysis of the Near Ultraviolet Absorption Spectra of <i>ortho-</i> and <i>para-</i>Dichlorobenzene Vapors

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  • Tosinobu Anno
    Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka, Japan
  • Ikuo Matubara
    Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka, Japan

抄録

<jats:p>The absorption spectra of o- and p-dichlorobenzene vapors appearing in the region 2900—2400 A and 2950—2400 A, respectively, were photographed and measured. For the ortho-spectrum the band at 36 232 cm—1 is assigned as the 0—0 band. The progression with frequency intervals of 1089 cm—1 starts from the stronger bands. For the para-spectrum, the band at 35 750 cm—1 is taken to be the 0—0 band. The only progression-forming frequency is 1051 cm—1. In both the spectra, most of the prominent bands are assigned to progressions or combinations of the possible fundamental frequencies. The fundamental frequencies are compared with the Raman values. From the vibrational analysis it is concluded that both molecules in the excited electronic states retain all their elements of symmetry in the ground states. For the para-compound the molecular structure in the upper state is discussed in some detail.</jats:p>

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