Synthesis, photophysics and molecular structures of luminescent 2,5-bis(phenylethynyl)thiophenes (BPETs)
作者:Jamie S. Siddle、Richard M. Ward、Jonathan C. Collings、Simon R. Rutter、Laurent Porrès、Lucas Applegarth、Andrew Beeby、Andrei S. Batsanov、Amber L. Thompson、Judith A. K. Howard、Abdou Boucekkine、Karine Costuas、Jean-François Halet、Todd B. Marder
DOI:10.1039/b701172e
日期:——
The spectroscopic studies of 1a–h and 2 show that both electron donating and electron withdrawing para-subsituents on the phenyl rings shift the absorption and emission maxima to lower energies, but that acceptors are more efficient in this regard. The short singlet lifetimes and modest fluorescence quantum yields (ca. 0.2–0.3) observed are characteristic of rapid intersystem crossing. The single-crystal