CPC H10K 71/60 (2023.02) [C07D 409/14 (2013.01); H10K 50/11 (2023.02); H10K 50/16 (2023.02); H10K 50/171 (2023.02); H10K 50/813 (2023.02); H10K 50/822 (2023.02); H10K 50/844 (2023.02); H10K 59/1213 (2023.02); H10K 59/131 (2023.02); H10K 71/00 (2023.02); H10K 85/654 (2023.02); H10K 85/655 (2023.02); H10K 85/6572 (2023.02); H10K 85/6576 (2023.02); H10K 59/121 (2023.02); H10K 59/1315 (2023.02); H10K 2102/361 (2023.02)] | 8 Claims |
1. A phase-transition optical isomer compound of formula:
wherein each of R1 to R4 is independently selected from a heteroaromatic group containing a nitrogen atom.
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