Elucidation of the chemiexcitation mechanism and an improvement of luminescence performance of the Cypridina bioluminescence system

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Based on the imidazopyrazinone molecular system related to Cypridina bioluminescence, studies were undertaken to elucidate the chemiexcitation mechanism to increase luminescence efficiency and to construct a high-performance chemiluminescence system. The studies on the chemiexcitation process lead to (1) clarify the role of π-conjugated substituents to modulate charge transfer in chemiexcitation and (2) establish the fundamental chemiluminescent property of (trialkoxyphenyl)imidazopyrazinones for investigating the effect of intermediate conformations. (3) The position effect of a π-conjugated substituent on chemiluminescence character of the imidazopyrazinones was also confirmed for designing a high-performance chemiluminescent derivative.