Received 25 February 2013
The title compound, C60H76Si2, a formally anti-aromatic system containing 20- electrons, contains a rare p-xylylene motif. This is displayed by the alternating short and long bonds. The outer rings possess nearly homogenous bond lengths. In the crystal, the molecules forms layers perpendicular to the c axis and within these layers there are two one-dimensional stacks with one stack that has a sp2 carbon contact of 3.283 (6) Å, less than the sum of the van der Waals radii. The center of the molecule sits on an inversion center.
Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: XS in SHELXTL (Sheldrick, 2008); program(s) used to refine structure: XL in SHELXTL; molecular graphics: XP in SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: PK2470 ).
The authors thank the National Science Foundation (CHE-1013032) for financial support. BDR acknowledges the American Chemical Society Division of Organic Chemistry for the 2012-2013 Troyanski Fellowship.
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