Engineering a twist in 9,10-diethynylanthracenes by steric interactions.
A series of 9,10-bis(phenylethynyl)anthracenes decorated with sterically demanding tert-butyl substituents have been prepared and spectroscopically characterised. We demonstrate that the introduction of two bulky substituents in the ortho position of the phenyl rings effectively locks the ground state into a conformation in which the three rings are orthogonal. Fluorescence spectroscopy reveals evidence for partial planarisation of this compound in the excited state at ambient temperature, but this is prevented in low temperature solvent glasses.
Beeby
Andrew
A
Department of Chemistry, University of Durham, Durham, UK. andrew.beeby@durham.ac.uk
Findlay
Karen S
KS
Goeta
Andrés E
AE
Porrès
Laurent
L
Rutter
Simon R
SR
Thompson
Amber L
AL