Acta Cryst. (2012). E68, o2340-o2341
[ doi:10.1107/S1600536812026797 ]

2,9-Diiodohexacyclo[9.3.1.1^2,6.1^4,8.1^9,13.0^1,8]octadecane

S. Ioannou and E. Moushi

Abstract: The title compound, C₁₈H₂₄I₂, has an adamantanoid structure with tetrahedral cages having four C atoms lying on the same plane [(I-)C-C-C-C(-I) torsion angle = 0°]. The plane is extended by the two I atoms, each having a deviation of 1.0 (6) Å [C-C-C-I torsion angle = 178.9 (4)°]. The central C-C bond connecting the two quaternary carbons seems enlarged [1.593 (9) Å] in comparison to the corresponding bond in [2]diadamantane [1.554 (3) Å]. This is attributed to the presence of the electronegative I atoms, which affect inductively the C atoms of the four-C-atom plane, making the central C-C bond weaker.

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