Conformational Control and Photophysical Properties of Methylene-Tethered Bis[(naphthalene-2-yl)vinyl]benzenes

摘要

We have synthesized and isolated three planar dibenzo-fused oligo(phenylenevinylene) isomers (l-DBCOPV2, u-DBCOPV2, and b-DBCOPV2), which serve as model compounds for rota- tional conformers of bis[(naphthalene-2-yl)vinyl]benzene. their photophysical properties were examined by UV/Vis absorption and emiSSion spectroscopy, revealing that their emiSSion colors changed from sky-blue to green depending on the conforma- tion. We have also measured their fluorescence lifetimes and carried out DFT calculations. these investigations revealed a more detailed conformation-dependent character for l- DBCOPV2, u-DBCOPV2, and b-DBCOPV2: the UV/Vis absorp- tion and emiSSion bands showed bathochromic shifts that increased in the order l-DBCOPV2