N4,N4'-bis(2,3-dimethyl-1-(p-tolyl)-1H-indol-5-yl)-N4,N4'-diphenyl-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-bis(dibenzo[b,d]selenophen-4-yl)-N4,N4'-diphenyl-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-di([1,1'-biphenyl]-4-yl)-N4-([1,1':3',1''-terphenyl]-5'-yl)-N4'-(spiro[cyclohexane-1,9'-fluoren]-2'-yl)-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-bis(dibenzo[b,e]pyrimido[4,5,6-gh]pyrrolizin-6-yl)-N4,N4'-diphenyl-[1,1'-biphenyl]-4,4'-diamine

N4,N4'-di([1,1'-biphenyl]-4-yl)-N4-([1,1':3',1''-terphenyl]-5'-yl)-N4'-(spiro[cyclopentane-1,9'-fluoren]-2'-yl)-[1,1'-biphenyl]-4,4'-diamine

4,4'-di(9H-5-oxa-9-aza-13b-boranaphtho[3,2,1-de]anthracen-9-yl)-1,1'-biphenyl

4,4'-bis(3,6-bis(benzo[d]oxazol-2-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(furo[3,2-b]pyridin-2-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3,6-diallyl-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3,6-divinyl-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(thiophen-2-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(furo[2,3-b]pyrazin-6-yl)-6-phenyl-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(furo[2,3-d]pyridazin-2-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(benzo[b]thiophen-2-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-([1,1'-biphenyl]-4-yl)-10H-phenoxazin-10-yl)-1,1'-biphenyl

4,4'-bis(3-(6-isopropyl-2-phenylfuro[3,2-b]pyridin-3-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(benzo[b]thiophen-2-yl)-6-(tert-butyl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(2-(4-(tert-butyl)phenyl)benzo[d]oxazol-6-yl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(4-(benzofuran-2-yl)-3,5-dimethylphenyl)-9H-carbazol-9-yl)-1,1'-biphenyl

4,4'-bis(3-(6-fluorobenzo[b]thiophen-2-yl)-6-phenyl-9H-carbazol-9-yl)-1,1'-biphenyl