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Two bipolar molecules 1a and 1b , which incorporate both electron-transporting oxadiazole and hole-transporting carbazolyl or N , N ′-dimethylphenyl moieties within the conjugation system, were synthesized and characterized by 1 H NMR, 13 C NMR, elemental analysis and mass spectrometry. The molecular structure of compound 1a was further confirmed by single X-ray crystallography. The solutions of both compounds in CH 2 Cl 2 individually displayed two absorption bands with λ max values at 376–378 nm and emitted with λ max values at 478–479 nm and quantum yields of 0.61–0.63. The cyclic voltammograms results showed that the carbazole-containing compound 1a has better hole injection ability than the N , N ′-dimethylphenyl end-capped 1b . |
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