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The new compound [(Crypt-2.2.2)H 2 ]I 8  has been prepared by the reaction of [(Crypt-2.2.2)H 2 ](I 3 ) 2  with iodine in methanol. It crystallizes in the orthorhombic space group Pbcn with a = 11.476 (2), b = 13.589 (2), c = 22.888 (2) Å and Z = 4. The crystal structure has been refined to R F  = 0.031 for 1618 reflections. It may be described as a layerlike packing of octaiodide anions I 8  2- and diprotonated 2.2.2-Crypt as cations. The non planar octaiodide anion is built up from two triiodide groups and a bridging iodine molecule.

zeitschrift für naturforschung b

Untersuchungen an Polyhalogeniden, XXXVI. Zur Kenntnis des Oktaiodid-Ions I 8  2- : Darstellung und Kristallstruktur des [(Crypt-2.2.2)H 2 ]l 8 , des [Ni(phen) 3 ]I 8  · 2CHCl 3  und der Bis(N-alkylurotropinium) oktaiodide (UrR) 2 I 8  mit R = Methyl und Ethyl / Studies on Polyhalides, XXXVI. On the Octaiodide Ion I 8  2- : Preparation and Crystal Structure of [(Crypt-2.2.2)H 2 ]I 8 , of [Ni(phen) 3 ]I 8 -2CHCl 3  and of the Bis(N-alkylurotropinium)octaiodides (UrR) 2 I 8  with R = methyl and ethyl