Abstract: Synthesis and Properties of New Conjugated Polymers based on Vat Dyes for Organic Electronics
The design and synthesis of conjugated building blocks with precise properties have been the corner stone of the recent development in organic electronics. Using modern synthetic tools and some basic design rules, chemists have prepared an impressive number of oligomeric and polymeric materials for multiple electronic applications. Surprisingly, only few commercially available dyes and pigments have been used as building blocks for these materials. Yet, some of these are very low cost and are produced in very large scale in pure form. Recently, we have reported the synthesis and characterization of vat orange 3 and vat orange 1 derivatives. Vat orange dyes are particularly interesting dye since they can be functionalized through C-C cross-coupling reaction and other organic transformations. Using few steps, we have also been able to extend the conjugation of this dye by fusing electron-rich heterocycles to it in order to tune its optoelectronic properties. Soluble and stable n-type, p-type and ambipolar oligomeric and polymeric materials have thus been prepared and the best candidates have been tested in field-effect transistors (OFETs) and organic solar cells (OSCs). The presentation will include the synthesis, characterization and devices testing for new conjugated materials based on these vat dyes. Finally, our recent efforts towards the synthesis of ullazine-based electron-rich units will be described.
Beijing Institute of Technology
Abstract: Tailored Supramolecular Polymerization of Liquid Crystalline Block Copolymers
The construction of hierarchical nanostructures with precise morphological and dimensional control has been one of the ultimate goals of contemporary materials science and chemistry, and the emulation of tailor-made nanoscale superstructures realized in the nature, using artificial building blocks, poses outstanding challenges. In this lecture, we present a facile and versatile supramolecular polymerization approach to fabricate nanostructures with precisely-determined dimensions and architectures from liquid crystalline block copolymers.