Investigations of the polyiodides H3O center dot I-x (x=3, 5 or 7) as dibenzo-18-crown-6 complexes

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