Abstract
The crystal structure of a new potassium hydrogendiiodate modification: KH(IO0:, has been determined from three-dimensional X-ray data by means of Patterson and Fourier syntheses and refinements by fullmatrix least-squares methods, with 580 independent reflexions, to give a conventional R of 0.059. X-ray diffraction patterns establish Fdd2 as the exact orthorhombic space group, with the unit-cell parameters a 39.294 (2),b = 8-157 (3),c 11.580 (2) A and 24 formula units per cell. The structure consists of iodate groups; the three covalently bonded O atoms of each group together with three further (weakly bonded) O atoms form highly distorted octahedra around two iodine atoms. However, there is a 'capped-octahedral" environment (sevenfold coordination) around the third iodine atom. The covalent 1-O bonds of the iodate groups, which form pseudotrigonal pyramids, lie in the range 1.75-1.84 A: the I -OH bonds arc 1.93 A and the weaker I -O bonds are 2.39-2.97 A. The K atoms are surrounded by eight O atoms forming distorted square prisms: the K O bond lengths are in the range 2.66-3.23 A. Fluctuations of the bond lengths are caused by a different degree of interaction with adjacent I atoms and by the action of two different kinds of hydrogen bonds.
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Schedule a callMore From: Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry
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