Gallaher, Joseph K. published the artcileEvolution of Nonmirror Image Fluorescence Spectra in Conjugated Polymers and Oligomers, Quality Control of 239075-02-6, the publication is Journal of Physical Chemistry Letters (2016), 7(17), 3307-3312, database is CAplus and MEDLINE.
The nonmirror image relation between absorption and fluorescence spectra of conjugated polymers contrasts with most organic chromophores and is widely considered a signature of interchromopohore energy funneling. The authors apply broad-band ultrafast fluorescence spectroscopy to resolve the evolution of fluorescence spectra for dilute solutions of conjugated oligothiophenes, where no energy transfer is possible. Fluorescence spectra evolve from a mirror image of absorption, which lacks vibronic structure, toward a spectrally narrower and vibronically structured species on the hundreds of femtosecond to early picosecond time scale. The authors’ anal. of this fluorescence spectral evolution shows that a broad distribution of torsional conformers is driven to rapidly planarize in the excited state, including in solid films, which is supported by Raman spectroscopy and quantum chem. modeling. The authors’ data have important implications for understanding different energy-transfer regimes that are delineated by structural relaxation.
Journal of Physical Chemistry Letters published new progress about 239075-02-6. 239075-02-6 belongs to alcohols-buliding-blocks, auxiliary class Thiophene,Boronic acid and ester,Boronate Esters, name is 5,5′-Bis(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-2,2′-bithiophene, and the molecular formula is C20H28B2O4S2, Quality Control of 239075-02-6.
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