Abstract
The structure of 5- p-N-N-dimethylaminophenyl-10,11-dihydro-5H-dibenzo-[ b,f]silepin has been determined from three-dimensional X-ray data collected by counter methods. The compound crystallizes in the monoclinic space group P2 1/ c a 14.121(4), b 14.379(3), c 9.126(2) Å and β = 99.57(2)°. The observed and calculated densities ( Z 4) are 1.19 and 1.20 g cm −3, respectively. Anisotropic refinement of nonhydrogen atoms with hydrogen atoms at fixed calculated positions gave a conventional R-factor of 4.6% for 2023 reflections with F 2 0 > 3σ( F 2 0). The central seven-membered ring of the tricyclic system exhibits a folded boat conformation; the dihedral angle between the benzo groups is 137.2°. The benzo groups are twisted approximately 21° relative to one another and skewed such that the two carbons bonded to silicon are 0.33 Å closer to one another than the two benzo ring carbons one atom removed from the silicon. The nitrogen atom is displaced 0.04 Å from the plane of the adjacent carbon atoms.
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