Photostability enhancement of the pentacene derivative having two nitronyl nitroxide radical substituents

Abstract

Pentacene derivatives possessing nitronyl nitroxide radical substituents (1a and 1b) were synthesized, and their photochemical properties were evaluated. 1a with two radical substituents showed a remarkable enhancement of photostability compared with pentacene, 6,13-bis(triisopropylsilylethynyl)pentacene and the monoradical, 1b. This is understood due to the presence of the multiple deactivation pathways in the photoexcited states.