Bis 4- -2-methylphenyl

N,N-bis(4-methylphenyl)-N,iV-bis(4-ethylphenyl)-[l,l -(3,3 -dimethyl)biphenyl]-4,4 -diamine [115310-63-9] (ETPD) (8) -doped PMPS (Table 1, entry 22), hole mobihty approaching 10 cm /Vs at 2.5 x 10 V/cm was observed (48). This is the highest recorded hole mobihty for disordered organic systems. From this perceptive, it is very interesting to study the carrier mobihty of polymers heavily doped with semiconductor nanoclusters. 

The organic solvent is removed by distillation under reduced pressure to give 4,4 -dimethyl-l,T-biplienyl contaminated with a small amount of bis(4-methylphenyl)thallium bromide. The crude product is dissolved in 30 ml. of benzene, and the solution is filtered through a short column of alumina (Note 7) using a total of 250 ml. of benzene as eluent. Distillation of the benzene under reduced pressure leaves 19-21 g. (80-83%) of 4,4 -dimethyl 1,1 -biphenyl as a colorless solid, m.p. 118-120° (Note 8). 

The dimensions of the alumina column arc not critical A column approximately 2 5 cm by 12 5 cm is recommended The small amount of bis(4-methylphenyl)thallium bromide formed in the reaction remains on the top of the column... 

T. Noda, H. Ogawa, N. Noma, and Y. Shirota, A novel yellow-emitting material, 5,5"-bis 4-[bis(4-methylphenyl)amino]phenyl -2,2 5, 2"-terthiophene, for organic electroluminescent devices, Appl. Phys. Lett., 70 699-701, 1997. 

Bipolar Molecular Glasses. Recently, bipolar molecular glasses have been described that allow both injection of holes and electrons (Fig. 3.30). 2- 4-[bis(4-methylphenyl)amino]phenyl -5-(dimesitylboryl)thiophene (PhAMB-lT, 68) and 2- 4-[bis(9,9-dimethylfluorenyl)amino]phenyl -5-(dimesitylboryl)thiophene (F1AMB-1T, 69) show oxidation potentials of 0.62 and 0.58 V, and reduction potentials of —2.13 and —2.01 V vs. Ag/0.01 Ag+, respectively [145]. Oxidation as well as reduction leads to stable radical ions. With the conversion rules given above, the HOMO and LUMO levels can be estimated to be approximately at —5.3 and —2.8 eV. In comparison, for the bipolar compound 70, consisting of triarylamine and oxadiazole moieties, the values are —5.5 and — 2.7eV [129]. However, in this case no data on the stability of the radical ions are available. 

Dihydro-l, 2,3,5-thiatriazole 1-oxide radicals were generated from the thiatriazole oxides upon hydrogen abstraction in the reaction with thermally formed bis(4-methylphenyl)aminyl (4.20.5.1). Only radicals with aryl substituents in positions two and four are persistent, radicals with alkyl groups in these positions could not be detected. The radicals were investigated by ESR, ENDOR, and general triple resonance spectroscopy <92MRC84>. 

N,N, JV"-Tris(p-tolylsnlfonyl)diethylenetriamine-N,lV"-disodium salt Diethylenetriamine, N,N, N"-tris(p-tolyIsulfonyl)-, disodium salt (8) Benzenesulfonamide, 4-methyl-N,N-bis[[[(4-methylphenyl) suIfonyl]amino]ethyl]-, disodium salt (9) (52601-80-6)... 

HYDROQUINONE, RESORCINOL, AND CATECHOL] (Vol 13) 4,4y-Cyclohexylidenebis[N,N-bis(4-methylphenyl)]benzenamine(l,l-bis( di-4-tolyl-ammophenyl)cyclohexane) [58473-78-2]... 

FIGURE 16. Stereoscopic packing diagram of dicarboxylic acid (66t). Reproduced by permission of Kluwer Academic Publishers from Reference 116... 

S-diethylaminophenyl)-l-phenyl-3-(i>-diethylaminostyryl)pyrazoline) (d) 4-(5H-dibezo[i , J]cyclohepten-5-ylidenemethyl) benzenamine [119544-18-2] (e) 4,4 -cyclohexylidenebis [N,IV-bis(4-methylphenyl)]benzenamine [58475-78-2] (l,l-bis(di-4-tolyl-aminophenyl)cyclohexane) (f)... 

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