Preparation and Photoluminescent Properties of Amino 2,1,3-Benzoxadiazoles (Am-BODs) with D-A-D and D-A-A Conjugation Systems.

A series of D-A-D and D-A-A conjugated compounds composed of a benzoxadiazole core and corresponding amino moiety were synthesized. Their photoluminescent properties in different states were investigated as well. In the solution state, some compounds were observed to possess the usual anti-Kasha's emission in toluene and the solvatofluorochromic phenomenon. Meanwhile, compound 1 a could be utilized as fluorescent chemosensor for the environmental acidity, and 2 c could be developed for detecting fluoride anion. Moreover, they were emissive in powders and films, and 2 d could be applied to the emissive layer in red OLEDs.