Luminescent molecules have been studied extensively as promising candidates for organic light-emitting diodes and chemical sensors. While almost all the luminescent molecules are of closed-shell nature in the ground state, the characteristic luminescent properties of organic radicals with open-shell character have attracted interest recently. However, several problems have hindered investigation of the photofunctions of luminescent organic radicals, including: (1) there are relatively few examples of luminescent organic radicals, and (2) the molecules degrade upon photoexcitation. Here we prepared a novel luminescent stable radical, (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical, PyBTM. PyBTM was luminescent under various conditions such as in solution, in PMMA matrix at room temperature, and in an EPA matrix at 77 K. Fluorescence quantum yield depended highly on the conditions. The photostability of PyBTM is up to 115 times higher than that of the tris(2,4,6-trichlorophenyl)methyl radical, which is a previously reported luminescent radical.

Luminescent properties of an open-shell organic radical with high photostability

249th National Meeting (2015)

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