The crystal structure of the ammonium bromide complex of 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6), C12H24O6 NH4Br 2H2O.
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概要
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Ammonium bromide forms a 1 : 1 complex with cyclic polyether "18-crown-6." The crystals of C<SUB>12</SUB>H<SUB>24</SUB>O<SUB>6</SUB>·NH<SUB>4</SUB>Br·2H<SUB>2</SUB>O are orthorhombic, with the space group of Pnam and with cell constants of <I>a</I>=10.002(3), <I>b</I>=12.716(4), <I>c</I>=15.073(4) Å, and <I>Z</I>=4. The structure was solved by the conventional heavy-atom technique and refined by the full matrix least-squares method to <I>R</I>=0.099 for 1033 independent reflections. The 18-crown-6 has a conformation with a pseudo D<SUB>3d</SUB> symmetry. The ammonium cation is displaced by 1.00 Å from the mean oxygen plane of the 18-crown-6 and interacts with the nearest bromide anion. The relationship between the cation and the 18-crown-6 resembles those of the C<SUB>12</SUB>H<SUB>24</SUB>O<SUB>6</SUB>·RbNCS and C<SUB>12</SUB>H<SUB>24</SUB>O<SUB>6</SUB>·CsNCS complexes. On the difference Fourier maps, four electron-density peaks were detected at reasonable positions for the hydrogen atoms of the amonium cation.
- 公益社団法人 日本化学会の論文
著者
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Nagano Osamu
Department Of Anesthesiology And Resuscitology Okayama University Medical School
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Kobayashi Akiko
Department Of Biopharmaceutics Meiji Pharmaceutical University
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Sasaki Yukiyoshi
Department of Chemistry and The Research Centre for Spectrochemistry, Faculty of Science, The University of Tokyo
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Nagano Osamu
Department of Chemistry, Faculty of Science, The University of Tokyo
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