Stoichiometry and conformation of the azacrown moiety in sodium complexes of azacrown ethers. a Raman/IR spectroscopic study. Part I: Complexes of 4,13-diaza-18-crown-6

  • Takayuki Chujo
  • Isao Saraoka
  • Shinobu Kato
  • Hiroyasu Sato
  • Koichi Fukuhara
  • Hiroatsu Matsuura


Three sodium complexes (bromide, iodide an thiocyanate) of 4,13-diaza-18-crown-6 were studied using Raman and IR spectroscopy and normal coordinate calculations to probe the stoichiometry of the complexes and the variation in the conformation of azacrown moiety on complex formation. Complex formation is accompaniedby characteristic shifts of the bands, especially of those in the 800–900 cm−1 region. Complexes of both 1: 1 and 2:1 stoichiometry were observed. Normal coordinate calculations showed the reduction of symmetry of azacrown moiety toC 2 , in contrast to theC 2h symmetry known for the parent azacrown and potassium thiocyanate complex.

Key words

Azacrown ether sodium complex conformation Raman/IR spectra normal mode calculations 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Takayuki Chujo
    • 1
  • Isao Saraoka
    • 1
  • Shinobu Kato
    • 1
  • Hiroyasu Sato
    • 1
    • 2
  • Koichi Fukuhara
    • 3
  • Hiroatsu Matsuura
    • 3
  1. 1.Department of Chemistry for Materials, Faculty of EngineeringMi'e UniversityTsuJapan
  2. 2.Institute for Molecular ScienceOkazakiJapan
  3. 3.Department of Chemistry, Faculty of ScienceHiroshima UniversityHigashi-HiroshimalJapan

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