TPA-active D-π-D fluorophores with rigid, planar cores from phenylene to indenofluorene and indolocarbazole

Article abstract of DOI:10.1016/j.dyepig.2009.11.009

A series of D-π-D quadrupolar fluorophores with systematically varied π-conjugated cores were prepared using the Heck reaction and their single- and two-photon photophysical properties were examined. Introduction of extended π-conjugated cores such as indenofluorene/indolocarbazole was found to induce only small shifts in the absorption and emission maxima versus the phenylene linked fluorophore but greatly enhance their single- and two-photon absorption cross-sections. The effects of positional substitution on the properties of the indolocarbazole derivatives were also investigated.