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Investigations of the polyiodides H3O center dot I-x (x=3, 5 or 7) as dibenzo-18-crown-6 complexes
KTH, Superseded Departments, Chemistry.
2000 (English)In: Journal of the Chemical Society-Dalton Transactions, ISSN 0300-9246, Vol. 7, no 7, 1061-1065 p.Article in journal (Refereed) Published
Abstract [en]

The compounds [H3O(dibenzo-18-crown-6)][I-x] (x = 3,5,7) have been synthesised and investigated by X-ray diffraction as well as Raman and far-IR spectroscopy. The structure of the triiodide contains two independent, slightly asymmetric and bent I-3(-) ions with I-I distances in the range 2.92-2.94 Angstrom. The pentaiodide can be described as composed of (I-3(-)). I-2, where the I-I distances in the asymmetric and slightly bent I-3 unit are 2.894(2) and 2.942(2) Angstrom and in the I-2 unit 2.763(2) Angstrom. The L-shaped I-5(-) ions are linked together forming a chain of I-10 rectangles through van der Waals interactions in the range 3.7-3.8 Angstrom. The structure determination supports a pyramidal geometry of the H3O+ ion in the dibenzo-18-crown-6 moiety of both structures. Because of severe crystal twinning the crystal structure of the heptaiodide could not be determined. However, the results from the spectroscopic investigation are consistent with a heptaiodide of composition (I-3(-)). 2I(2).

Place, publisher, year, edition, pages
2000. Vol. 7, no 7, 1061-1065 p.
Keyword [en]
resonance raman, crystal-structures, h3o+ cation, iodine, anions, ions, spectroscopy, polyhalides, trihalides, networks
URN: urn:nbn:se:kth:diva-19651ISI: 000086163700013OAI: diva2:338343
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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