2017 Volume 46 Issue 8 Pages 1145-1147
The cyclic pentamer of 4-butyltriphenylamine (CBTPA ) was prepared by the Pd-catalyzed C–N coupling reaction followed by purification with a combination of chromatographic techniques. Due to the rigid cyclic structure, the glass-transition temperature of CBTPA  was 215 °C. The space-charge-limited current mobility in its amorphous film was determined to be 1.3 × 10−4 cm2 V−1 s−1 which was higher than that of poly(4-butyltriphenylamine) (PBTPA) by a factor of 100. The higher mobility is ascribed to the higher purity of CBTPA , monodispersed nature, and homogeneous electron distribution of the highest occupied molecular orbital.
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