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제1항에 있어서,하기 그룹으로부터 선택되는 화합물:3,8-difluoro-5,10-dihexyl-2,7-bis(3-hexyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 2);2,7-bis(3-butyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 3);5,10-dibutyl-3,8-difluoro-2,7-bis(3-hexyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 4);5,10-dibutyl-2,7-bis(3-butyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 5);3,8-difluoro-2,7-bis(3-hexyl-[2,2'-bithiophen]-5-yl)-5,10-dioctyl-5,10-dihydroindolo[3,2-b]indole (화학식 6);3,8-difluoro-5,10-dioctyl-2,7-bis(3-octyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 7);3,8-dichloro-5,10-dihexyl-2,7-bis(3-hexyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 8);2,7-bis(3-butyl-[2,2'-bithiophen]-5-yl)-3,8-dichloro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 9);5,10-dibutyl-3,8-dichloro-2,7-bis(3-hexyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 10);5,10-dibutyl-2,7-bis(3-butyl-[2,2'-bithiophen]-5-yl)-3,8-dichloro-5,10-dihydroindolo[3,2-b]indole (화학식 11);3,8-dichloro-2,7-bis(3-hexyl-[2,2'-bithiophen]-5-yl)-5,10-dioctyl-5,10-dihydroindolo[3,2-b]indole (화학식 12);3,8-dichloro-5,10-dioctyl-2,7-bis(3-octyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 13);2,7-bis(3-(2-ethylhexyl)-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 14);2,7-bis(3-(2-ethylhexyl)-[2,2'-bithiophen]-5-yl)-3,8-dichloro-5,10- dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 15);2,7-bis(3-(2-butyloctyl)-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10- dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 16);2,7-bis(3-(2-butyloctyl)-[2,2'-bithiophen]-5-yl)-3,8-dichloro-5,10- dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 17);3,8-difluoro-5,10-dihexyl-2,7-bis(3-hexyl-5'-methyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 18);2,7-bis(3-butyl-5'-methyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10- dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 19);5,10-dibutyl-3,8-difluoro-2,7-bis(3-hexyl-5'-methyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 20);5,10-dibutyl-2,7-bis(3-butyl-5'-methyl-[2,2'-bithiophen]-5-yl)-3,8- difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 21);3,8-difluoro-2,7-bis(3-hexyl-5'-methyl-[2,2'-bithiophen]-5-yl)-5,10-dioctyl-5,10-dihydroindolo[3,2-b]indole (화학식 22);3,8-difluoro-2,7-bis(5'-methyl-3-octyl-[2,2'-bithiophen]-5-yl)-5,10- dioctyl-5,10-dihydroindolo[3,2-b]indole (화학식 23);2,7-bis(3-(2-ethylhexyl)-5'-methyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 24);2,7-bis(3-(2-butyloctyl)-5'-methyl-[2,2'-bithiophen]-5-yl)-3,8- difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 25);2,7-bis(3,5'-dihexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 26);2,7-bis(3-butyl-5'-hexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10- dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 27);5,10-dibutyl-2,7-bis(3,5'-dihexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 28);5,10-dibutyl-2,7-bis(3-butyl-5'-hexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 29);2,7-bis(3,5'-dihexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dioctyl-5,10-dihydroindolo[3,2-b]indole (화학식 30);3,8-difluoro-2,7-bis(5'-hexyl-3-octyl-[2,2'-bithiophen]-5-yl)-5,10-dioctyl-5,10-dihydroindolo[3,2-b]indole (화학식 31);2,7-bis(3-(2-ethylhexyl)-5'-hexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 32);2,7-bis(3,5'-bis(2-ethylhexyl)-[2,2'-bithiophen]-5-yl)-3,8-difluoro- 5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 33);2,7-bis(3-(2-butyloctyl)-5'-hexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihexyl-5,10-dihydroindolo[3,2-b]indole (화학식 34);5,10-bis(2-ethylhexyl)-3,8-difluoro-2,7-bis(3-hexyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 35);5,10-bis(2-ethylhexyl)-3,8-difluoro-2,7-bis(4-hexyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 36);5,10-bis(2-ethylhexyl)-3,8-difluoro-2,7-bis(3-hexyl-5'-methyl-[2,2'- bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 37);2,7-bis(3,5'-dihexyl-[2,2'-bithiophen]-5-yl)-5,10-bis(2-ethylhexyl)- 3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 38);5,10-bis(2-ethylhexyl)-3,8-dichloro-2,7-bis(3-hexyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 39);5,10-bis(2-ethylhexyl)-3,8-dichloro-2,7-bis(4-hexyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 40);5,10-bis(2-ethylhexyl)-3,8-dichloro-2,7-bis(3-hexyl-5'-methyl-[2,2'- bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 41);2,7-bis(3,5'-dihexyl-[2,2'-bithiophen]-5-yl)-5,10-bis(2-ethylhexyl)- 3,8-dichloro-5,10-dihydroindolo[3,2-b]indole (화학식 42);5,10-bis(2-ethylhexyl)-2,7-bis(3-(2-ethylhexyl)-[2,2'-bithiophen]-5- yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 43);3,8-dichloro-5,10-bis(2-ethylhexyl)-2,7-bis(3-(2-ethylhexyl)-[2,2'- bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 44);5,10-bis(2-ethylhexyl)-3,8-difluoro-2,7-bis(3-hexyl-[2,2'-bithiophen]- 5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 45);5,10-bis(2-ethylhexyl)-2,7-bis(4-(2-ethylhexyl)-[2,2'-bithiophen]-5- yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 46);5,10-bis(2-ethylhexyl)-2,7-bis(3-(2-ethylhexyl)-5'-methyl-[2,2'-bi- thiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 47);5,10-bis(2-ethylhexyl)-2,7-bis(3-(2-ethylhexyl)-5'-hexyl-[2,2'-bi- thiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 48);2,7-bis(3,5'-bis(2-ethylhexyl)-[2,2'-bithiophen]-5-yl)-5,10-bis(2- ethylhexyl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 49);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-3,8-difluoro-2,7-bis(3-hexyl- [2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 50);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-3,8-difluoro-2,7-bis(4-hexyl- [2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 51);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-3,8-difluoro-2,7-bis(3-hexyl- 5'-methyl-[2,2'-bithiophen]-5-yl)-5,10-dihydroindolo[3,2-b]indole (화학식 52);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-2,7-bis(3,5'-dihexyl-[2,2'- bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 53);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-2,7-bis(3-(2-ethylhexyl)-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 54);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-2,7-bis(4-(2-ethylhexyl)-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 55);5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-2,7-bis(3-(2-ethylhexyl)-5'- methyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 56); 및5,10-bis(bis(4-(hexyloxy)phenyl)methyl)-2,7-bis(3-(2-ethylhexyl)-5'- hexyl-[2,2'-bithiophen]-5-yl)-3,8-difluoro-5,10-dihydroindolo[3,2-b]indole (화학식 57)
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