Abstract
We have synthesized two boron complexes of 3-(o-hydroxyphenyl)imidazo[1,5-a]pyridine exhibiting blue emission in solution. The transient absorption and theoretical studies of the complexes and their 1-(o-hydroxyphenyl) substituted isomers revealed that the phenolic substituent position in boron complex of imidazo[1,5-a]pyridine affected the excites state dynamics involved in photoluminescence (PL). Although the introduction of phenolic substituent at 1-position of the boron complex is effective to achieve the strong emission, the introduction of phenolic substituent at 3-position results in the decreasing PL quantum yield due to intersystem crossing from the singlet excited state to the triplet excited state.
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