Effect of Halogens in Bis(haloaryloxyl)pyrazine Host Crystals on the Room Temperature Phosphorescence Properties of Bisbenzofuropyrazine Guest Luminophores

Tunable mechanochromic luminescence of benzofuran-fused pyrazine: effects of alkyl chain length and branching pattern

“…Moreover, their bent-type isomers, bis(benzofuro)[2,3- b :3′,2′- e ]pyrazines ( Bent-R ), were also synthesized, and parent unsubstituted bis(benzofuro)[2,3- b :3′,2′- e ]pyrazine ( Bent-H : R = H) was found to be a good phosphorescent emitter in a dispersed state. 52,53…”

“…Moreover, their bent-type isomers, bis(benzofuro)[2,3-b:3 0 ,2 0 -e]pyrazines (Bent-R), were also synthesized, and parent unsubstituted bis(benzofuro)[2,3-b:3 0 ,2 0 -e]pyrazine (Bent-H: R = H) was found to be a good phosphorescent emitter in a dispersed state. 52,53 In this paper, we report detailed physical and optical properties of a series of newly synthesized alkyl-substituted bis(benzofuro)[2,3b:2 0 ,3 0 -e]pyrazines (Linear-R). Some compounds formed crystalline polymorphs under different recrystallization conditions.…”

Stimuli‐Responsive Properties on a Bisbenzofuropyrazine Core: Mechanochromism and Concentration‐Controlled Vapochromism

“…In particular, 2,8‐di‐ tert ‐butyl‐bisbenzofuro[2,3‐ b :2′,3′‐ e ]pyrazine formed two different crystal polymorphs and exhibited self‐healing mechanochromic properties. Moreover, their bent‐type isomers, bis(benzofuro)[2,3‐ b :3′,2′‐ e ]pyrazines ( Bent‐R ), were also synthesized, and parent unsubstituted bis(benzofuro)[2,3‐ b :3′,2′‐ e ]pyrazine ( Bent‐H ) was found to be a good phosphorescent emitter in a dispersed state [11,12] …”

“…Moreover, their bent-type isomers, bis(benzofuro) [2,3-b:3',2'-e]pyrazines (Bent-R), were also synthesized, and parent unsubstituted bis(benzofuro) [2,3-b:3',2'-e]pyrazine (Bent-H) was found to be a good phosphorescent emitter in a dispersed state. [11,12] In this paper, we report detailed physical and optical properties of Bent-H and newly synthesized sec-butylated bis(benzofuro) [2,3-b:3',2'-e]pyrazine (Bent-sBu). Compared to the linear-type bis(benzofuro) [2,3-b:2',3'-e]pyrazines (Linear-R), these bent-type isomers are soluble in various solvents, such as chloroform and ethyl acetate, owing to their reduced symmetry.…”