title: Synthesis, crystal structures, and photophysical properties of electron-accepting diethynylindenofluorenediones.
abstract: 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.
authors.affiliation: Department of Chemistry & Materials Science Institute, University of Oregon, Eugene, Oregon 97403-1253, USA.
authors.forename: Bradley D
authors.initials: BD
authors.lastname: Rose
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Chase
authors.forename: Christopher D
authors.initials: CD
authors.lastname: Weber
authors.forename: Lev N
authors.initials: LN
authors.lastname: Zakharov
authors.forename: Mark C
authors.initials: MC
authors.lastname: Lonergan
authors.forename: Michael M
authors.initials: MM
authors.lastname: Haley