Monday, 23 May 2005 - 2:00 PM

This presentation is part of: Solid State and Materials Chemistry II

Solution processable semiconductive coordination networks based on large aromatic building blocks

Zhengtao Xu, Kunhao Li, Hanhui Xu, and Jacqueline M. Ryan. The George Washington University, Washington, DC

We present our initial efforts to promote electronic communications across polycyclic aromatic molecules through intervening metal halides moieties. Such efforts stand as part of the larger scheme to overcome the limitation of the van der Waals barrier in molecular semiconductors. In particular, the polycyclic aromatic ligands of 2,3,6,7,10,11-hexakis(alkylthio)triphenylene (alkyl: methyl, ethyl and isopropyl; corresponding abbreviations for the molecules: HMTT, HETT and HiPTT) were interacted with bismuth(III) bromide and chloride to produce in high yields a series of semiconductive hybrid networks featuring flexible network dimensionalities and electronic properties, as well as promising solution processing properties. Enlarging the side group from methyl to ethyl and to isopropyl groups effectively reduces the dimensionality of the bismuth halide components (and consequently the dimensionality of the overall coordination framework). Solid-state optical absorption measurements indicate effective electronic interactions between the organic g-system and the bismuth trihalide component, and the electronic band gap decreases monotonically with increasing dimensionality of the coordination network. Compared with molecular semiconductors, these integrated hybrid networks feature stronger electronic communication across the organic molecules, and point to potentially higher charge carrier mobilities.

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