Materials Science

New Concepts in Synthetic Chemistry - Toward Innovation in the Organic Electronics
Shigehiro Yamaguchi, Nagoya University

1. Introduction: Replacing bulk inorganic materials with functional organic materials has recently gained strong momentum in the (opto)electronics. In this so-called “soft-electronics”, the main players are π-conjugated molecules consisting of carbon-carbon unsaturated bonds.1 Their precise molecular design enables us to open new aspects not only in achieving high performance, but also providing new directions in applications. The creation of one truly excellent molecule would lead to give a significant impact on the advancements in our standard of living, through evolution in the sophisticated (opto)electronic devices, such as flexible large-area display, flexible white backlight, printable integral circuit, and organic laser.

2. Main Group Element Approach to Functional Organic Materials: To develop key materials in this area, the exploration of seeds in the main group chemistry (B, Si, P, S, and Se etc.) may be a new powerful direction. The molecular design exploiting notable features of main group elements, such as effective orbital interaction, various valence numbers, and unique structural features, allows us to create a broad spectrum of functional molecules with superior electronic or photophysical properties.2 How to achieve their efficient synthesis is another crucial issue. Without providing a large quantity of the molecule (gram-scale at least), the science would not be evolved. To this end, a tailored synthetic route to the designed π-conjugated skeleton, including the development of a new reaction, is required. As an example of this type of synthesis,
we recently synthesized fused oligothiophenes based on a new acetylenic cyclization. These compounds have highly aligned packing structures in crystalline states, and have great potentials as a stable and high performance material for organic thin film transistors (TFTs).

1. T. J. J. Muller, U. H. F. Bunz, Eds., Functional Organic Materials, Wiley-VCH, Weinheim (2007)

2. S. Yamaguchi and K. Tamao, Chem. Lett. (Highlight Review), 34, 2 (2005).

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Materials Science

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