- 作者: B. C. Maitia, S. Z. Wanga, C. P. Chenga, D. J. Huangb and C.-I. Chaob
- 作者服務機構: Department of Chemistry, National Tsing Hua University, Hsin-chu, Taiwan 300, R.O.C.
- 中文摘要: A series of N,N,N,N'-tetraaryl(Ar12Ar22)-1,1'-biphenyl-4,4¢-diamine were synthesized by the Pd(0) catalyzed C-N bond formation methodology. The physical properties, including glass transition temperature (Tg), melting point (Mp) and oxidation potential were measured. For Ar1 = 2-naphthyl and Ar2 = 3-toly (4f) and Ar2 = 3-ethylphenyl (4h), the DSC charts indicate that they have Tg, but no observable Mp. These two compounds are amorphous in solid state. The X-ray powder diffraction pattern of 4f further confirmed that it is truly amorphous throughout the temperature range in which it is solid. Therefore, we have demonstrated that a low molecular weight organic solid can be amorphous. This is an important aspect in the preparation of morphologically stable amorphous thin film. Other compounds with Ar1 = Ph, 1-naphthyl while Ar2 = 3-toly or 3-ethylphenyl are normal compounds with both Tg and Mp when prepared in their glassy state by rapid cooling of their melt. The oxidation potentials for compounds with Ar1 = 1-naphthyl and 2-naphthyl and identical Ar2 are exactly the same. The molecular structural features must be important factors for an organic solid to be in the amorphous state
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