A dithienyl unit in a N,C-chelate monoboryl compound has been found to completely stabilize a N,C-chelate borylchromophore toward photoisomerization. N,C-chelate diboryl compounds that contain a dithienyl unit display a similar high stability toward photoisomerization. This greatly enhanced photostability is attributed to the π → π* transition and luminescence involving the dithienyl unit that competes effectively with photoisomerization of the borylchromophore.
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