Mesomorphic phthalocyanines, tetraazaporphyrins, porphyrins and triphenylenes as charge-transporting materials

作者：Holger Eichhorn · 发表于：Journal of Porphyrins and Phthalocyanines · 年份：2000 · DOI：10.1002/(sici)1099-1409(200001/02)4:1<88::aid-jpp208>3.0.co;2-6 · 被引用次数：180 · 研究领域：Porphyrin and Phthalocyanine Chemistry、Synthesis and Properties of Aromatic Compounds、Liquid Crystal Research Advancements

The columnar mesomorphism of triphenylene-, phthalocyanine-, tetraazaporphyrin- and porphyrin-based compounds is briefly reviewed and the potential use of this particular supramolecular structure for charge-conducting devices is discussed. Suitably substituted triphenylenes exhibit ideal material properties for photoconducting devices, and well-aligned layers have been shown to give a very high charge carrier mobility of 0.1 × 10-4 m 2 V -1 s -1 (time-of-flight measurements). From a molecular point of view, porphyrin systems should be superior to triphenylenes, but the properties of their mesophases do not support the advantageous homeotropic alignment of the columnar stacks. However, pulse radiolysis time-resolved microwave conductivity measurements revealed the highest charge carrier mobility value of 0.28 × 10-4 m 2 V -1 s -1 for mesomorphic phthalocyanines.