Polymers possessing a silicon-bridged π-conjugated repeating unit constitute an important class of compounds for their potential utility as optoelectronic materials. Herein we developed a rhodium-catalyzed stitching polymerization of nonconjugated and readily prepared alkynylsilylacetylenes for the synthesis of new πconjugated polymers with ladder-type silicon-bridged repeating units. The polymerization proceeded smoothly by employing a Rh/ tfb complex as the catalyst, and not only diynes but also triynes and tetraynes could be polymerized in a stitching manner to give polymers that are inaccessible by existing methods. The solubility of the polymers in different types of solvents could be controlled by introducing appropriate functional groups on the silicon atoms, and sequence-controlled functionalized polyacetylenes could be accessed by protodesilylation of the stitched polymers. Physical properties of the obtained polymers were also investigated to understand their characteristic features.
A marker system based on the binary translation of two-dimensional coordinate numbers was developed to facilitate the positional determination of individual nanomaterial adsorbed randomly on a substrate. The design of the coordinate markers enabled simple calculations of the position of the selected individual nanomaterial from an atomic force microscope image. This position information was used to fabricate metal contact structures for the selected nanomaterial. We demonstrated that the coordinate markers were successfully used to prepare field-effect transistors with a thin bundle of single-walled carbon nanotubes.
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