Publication Details (including relevant citation information):
Rose, Bradley D., Chase, Daniel T., Weber, Christopher D., Zakharov, Lev N., Lonergan, Mark C., Haley, Michael M., Organic Letters, 2011, 13 (8), 2106–2109
A series of 6,12-bis[(trialkylsilyl)ethynyl]indeno[1,2-b]fluorene-5,11-diones has been synthesized. X-ray crystallographic analysis of these compounds reveals that triisopropylsilyl (TIPS) substitution on the alkyne terminus affords the largest number of intermolecular π−π interactions in the solid state. Conversely, use of trialkylsilyl groups smaller or larger than TIPS furnishes a variety of crystal-packing motifs that contain fewer π−π interactions. Electrochemical and photophysical data suggest that these molecules are excellent electron-accepting materials.
Address (URL): http://dx.doi.org/10.1021/ol200525g