| CPC H10K 30/86 (2023.02) [C07C 213/00 (2013.01); C07C 213/08 (2013.01); C07C 217/92 (2013.01); C07D 333/20 (2013.01); H10K 30/40 (2023.02); H10K 85/631 (2023.02); H10K 85/636 (2023.02); H10K 85/655 (2023.02); H10K 2101/30 (2023.02)] | 11 Claims |

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1. A compound having a structure of formula (I),
![]() wherein R1 is trivalent phenyl, optionally 1,3,4-benzenetriyl;
R2 is a single bond, C2-C6 conjugated alkenylene or an unsaturated 5-membered or 6-membered ring group containing heteroatoms selected from O, S, or Se; and optionally, R2 is single bond vinylidene furylidene thiophenylene or selenophenylene.
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