83838-01-1Relevant academic research and scientific papers
Poly(silyleneethynylenephenylene) and poly(silylenephenyleneethynylenephenylene)s: Synthesis and photophysical properties related to charge transfer
Kwak, Giseop,Masuda, Toshio
, p. 4138 - 4142 (2007/10/03)
Novel poly(dimethylsilyleneethynylenephenylene) and poly(dimethyl (or diphenyl) silylenephenyleneethynylenephenylene)s without diyne defects were synthesized by using the Pd/Cu-catalyzed AB-type coupling reaction. 6's showed small but clear π-to-σ charge-transfer absorption bands at longer wavelengths (>340 nm) than those of π-π* absorption bands (max ca. 370 nm) with a large Stokes shift. On the other hand, when excited at the charge-transfer absorption wavelengths, 6's exhibited only the intramolecular charge-transfer emission with a maximum above 390 nm. This suggests that the indigo blue light emission of 6's is due to the charge-transfer phenomenon and not to the locally excited π* state. The charge-transfer character of 6's was clearly verified by the shift of emission in polar solvents.
