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    QIBEBT International Expert Forum---QIBEBT International Expert Forum
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    Update time: 2013-10-16
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    Title: Selenium and Tellurium-Containing pi-Conjugated Materials

    Speaker: Professor Dwight S. Seferos, Chemistry Department, – University of Toronto

    Host: Prof. YANG Renqiang

    Time & Date: 14:30, October 23, 2013, Wednesday

    Place: Meeting Room 201

    Abstract:

     

    My research group focuses on the chemistry of selenophene and tellurophene heterocycles. We have recently synthesized selenophene-thiophene block copolymers and discovered that they exhibit broad light absorption properties and phase-separated domains in the solid-state. All of our experimental data indicate that blocks of distinct heterocycles undergo a significant amount of phase separation. This is surprising given the chemical similarities between repeat units, however we have uncovered several properties, including crystal packing and solvation, that differ in these polyheterocycles. The polymers can be used to organize spherical CdSe nanocrystals into aligned hierarchical structures, and when combined with a fullerene derivative, they function as the light-harvesting component in a solar cell. We have also learned how to synthesize polymers and delocalized molecules based on tellurophene, and identified several unexpected properties in these materials including reversible binding of small molecules and chemochromic behavior. Recently, we have prepared the tellurium analog of ‘P3HT’ and found that it is a solution processable material. Selenium and tellurium-containing pi-conjugated materials have interesting and useful optoelectronic properties and are distinct from their lighter group 16-analogs.

     

    Selected Publications:

    [1] Hollinger, J.; Jahnke, A. A.; Coombs, N.; Seferos, D. S. J. Am. Chem. Soc. 2010, 132, 8546-8547.

    [2] Jahnke, A. A.; Howe, G.; Seferos, D. S. Angew. Chem. Int. Ed. 2010, 49, 10140-10144.

    [3] Li, L.; Hollinger, J; Coombs, N.; Petrov, S.; Seferos, D. S. Angew. Chem. Int. Ed. 2011, 50, 8148-8152.

    [4] McCormick, T. M.; Jahnke, A. A.; Lough, A. J.; Seferos, D. S. J. Am. Chem. Soc. 2012, 134, 3542-3548.

    [5] Gibson, G. L.; McCormick, T. M.; Seferos, D. S. J. Am. Chem. Soc. 2012, 134, 539-547.

    [6] Gao, D.; Hollinger, J.; Seferos, D. S. ACS Nano, 2012, 6, 7114.

    [7] Jahnke, A. A.: Djukic, B.; McCormick, T. M.; Domingo, E. B.; Hellmann, C.; Lee, Y; Seferos, D. S. J. Am. Chem. Soc. 2013, 135, 951.

     

    Speaker's Bio:

    Dwight Seferos attended Western Washington University, completing a B.S. degree in 2001. He entered the graduate school at the University of California, Santa Barbara where he worked under the supervision of Guillermo Bazan on the synthesis and study of organic molecules with delocalized pi-electron systems. After completing a Ph.D. in 2006, Seferos moved to Northwestern University where he was an American Cancer Society Postdoctoral Fellow with Chad Mirkin. In 2009, Seferos began his independent laboratory in the Chemistry Department at the University of Toronto where he and his highly talented team of students and postdoctoral fellows study the optical and electronic properties of semiconducting polymers and nanomaterials. He has authored or coauthored over 50 publications and has 6 patents (one of which is currently licensed to Millipore). Since beginning his independent career he has been recognized as a DuPont Young Professor (2011), Ontario Early Research Award (2011), Canada Research Chair (2012), and Alfred P. Sloan Research Fellowship (2013).

     

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