Crystal structures of tropylium perchlorate and iodide
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An x-ray structural investigation was made of the structure of tropylium perchlorate and iodide monocrystals by means of three-dimensional electron density series.
In both structures the tropylium ion occupied a statistically disordered position in the crystal, i.e., it “rotated” about an axis perpendicular to the plane of the ring. The radius of the ring was measured and the C-C bond length calculated as 1.47 A.
The packing of molecules in the crystals was analyzed. The distortion of the form of the perchlorate ion is due to intermolecular forces, tending to arrange the molecules with maximum density.
Though there are in general no doublts about the ionic nature of the structures, attention should be paid to the polarity of the tropylium iodide crystal, which may indicate the presence of a weak exchange bond between the ring and the iodine ion.
KeywordsCrystal Structure Iodine Iodide Bond Length Perchlorate
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