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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

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Abstract

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.

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Correspondence to Hiroyasu Sato.

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Chujo, T., Saraoka, I., Kato, S. et al. 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. J Incl Phenom Macrocycl Chem 20, 173–190 (1994). https://doi.org/10.1007/BF00709341

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Key words

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