Octupolar organoboron chromophores derived from terthienobenzene

Two novel octupolar organoboron compounds, namely 1,3,5-tris[5-(dimesitylboryl)thiophen-2-yl]terthienobenzene and 1,3,5-tris[4-(dimesitylboryl)phenyl]terthienobenzene, symmetrically extended from terthienobenzene (TTB) with dimesitylboryl groups as electron acceptors have been synthesized. These TTB derivatives exhibited strong blue-green emission in common solvents under single or two-photon excitation (Φfl > 30%), as well as good thermal stability (Tg > 150 °C).

Two new TTB derived octupolar organo borane exhibited strong blue-green emission in common solvents under single or two-photon excitation (Φfl > 30%), as well as good thermal stability (Tg > 150 °C).Figure optionsDownload as PowerPoint slideHighlights
► Two new octupolar terthienobenzene (TTB) derivatives with dimesitylboryl as terminal acceptors were synthesized.
► These compounds show high fluorescence quantum yields and good thermal stabilities.
► TTB will allow enhanced π-electron delocalization, but may not be suitable for two-photon absorptions materials.