Benniston, Andrew C. published the artcileIntramolecular excimer formation and delayed fluorescence in sterically constrained pyrene dimers, Safety of Pyrene-2-carboxylic acid, the main research area is intramol excimer delayed fluorescence sterically constrained pyrene dimer.
The synthesis is described for five mol. dyads comprising pyrene-based terminals covalently linked through a 1,3-disubstituted phenylene spacer. The extent of through-space communication between the pyrene units is modulated by steric interactions imposed by bulky moieties attached at the 6,8-positions of each pyrene unit. For the control compound, only hydrogen atoms occupy the 6,8 positions (DP1), whereas the remaining compounds incorporate ethynylene groups terminated with either triisopropylsilyl (DP2), 1-tert-butylbenzene (DP3), 2,6-di-tert-butylbenzene (DP4) or 1-tert-butyl-3,5-dimethylbenzene (DP5) units. Each compound shows a mixture of monomer and excimer fluorescence in fluid solution at room temperature, but only monomer emission in a glassy matrix at 77 K. The ratio of monomer to excimer fluorescence depends markedly on the mol. structure; DP1 is heavily biased in favor of the excimer and DP4 is enriched with monomer fluorescence. Photophys. properties, including laser induced and delayed fluorescence data, are reported for each compound Delayed fluorescence occurs by both intramol. and bimol. steps, but these events take place on different timescales. The possibility is raised for using intramol. triplet-triplet annihilation as a means of mol. imaging.
Chemistry – A European Journal published new progress about Correlation analysis. 36428-96-3 belongs to class chlorides-buliding-blocks, name is Pyrene-2-carboxylic acid, and the molecular formula is C17H10O2, Safety of Pyrene-2-carboxylic acid.
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