|Speaker||Prof. Eunsung Lee|
|Date||Thu. 28 Sep. 2017|
|Venue||#331, Asan Hall, College of Science|
“Activation of Small Molecules at N-heterocyclic Carbenes
and their Application to Metal-organic Materials”
N-Heterocyclic Carbenes (NHCs) have been intensively explored for stabilizing unstable species such as radicals and zerovalent nonmetal species, and for activating small molecules such as CO, H2, NH3, N2O, NO, etc.1,2 Such a capability of NHCs can be attributed to their strong donor characters and steric tunability that lead to the remarkable reactivity. Recently, we reported N-heterocyclic carbene nitric oxide (NHCNO) radicals, which can be also considered as iminoxyl radicals. NHCNO radicals react with silyl and alkyl triflate to generate the corresponding radical cations.3 The structures of the unprecedented oxime ether radical cations were determined by X-ray crystallography. Furthermore, we also found that triazenyl cations stabilized by NHC form the corresponding triazenyl radicals upon the treatment of elemental potassium as a reductant.4 The triazenyl radicals were fully characterized by single-crystal X-ray analysis and electron paramagnetic resonance (EPR) spectroscopy. The details of synthesis, characterization, and formation mechanisms of the compounds will be discussed.
With the novel reactivity of NHCs, we also have also been exploring porous metal–organic frameworks (MOFs) and cages (MOCs) with various N-heterocyclic carbene precusors, imidazolium salts, and metal ions due to their potential applications such as catalysis, gas storage, molecular separations, etc. Since MOFs and MOCs can be constructed with a variety of structural and functional diversity via a modular approach, the facile tunability of the materials is available for appropriate applications. I will discuss the synthetic progress for MOFs and MOCs.
 Park, J.; Song, H.; Kim, Y.; Eun, B.; Kim, Y.; Bae, Y.; Park, D. S.; Rhee, Y. M.; Kim, W. J.; Kim, K.; Lee, E. J. Am. Chem. Soc. 2015, 137, 4642.
 Song, H.; Kim, Y.; Park, J.; Kim, K.; Lee, E. Synlett. 2016, 27, 477.
 Kim, Y.; Kim, K.; Lee, E. submitted.
 Back, J.; Park, J.; Y. Kim, Y.; Kim, K.; Lee, E. submitted.
|Notice||Fall semester 2017 Seminar Schedule||-||-|
|41||[Thu. 26 Oct. 2017] Dr. Jung-Nyoung Heo/Center for Medicinal Chemistry Research, Korea Research Institute of Chemical Technology, Daejeon, Korea||Dr. Jung-Nyoung Heo||Thu. 26 Oct. 2017|
|40||[October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences||Dr. Byung-Kuk Yoo||October 25, 2017|
|39||[Mon. 16 Oct. 2017] Prof. Kirk S. Schanze/Department of Chemistry, University of Texas at San Antonio, Texas, USA||Prof. Kirk S. Schanze||Mon. 16 Oct. 2017|
|38||[Fri. 13 Oct. 2017] Dr. J. Nathan Hohman/The Molecular Foundry, Lawrence Berkeley National Laboratory, California, USA||Dr. J. Nathan Hohman||Fri. 13 Oct. 2017|
|37||[Thu. 12 Oct. 2017] Student Host Colloquium : Versatile Dendrimer-Encapsulated Nanoparticles for Analytical Applications||Prof. Joohoon Kim||Thu. 12 Oct. 2017|
|36||[October 10, 2017] Novel Terahertz Spectroscopies||Director Mischa Bonn||Tue, October 10, 2017|
|»||[Thu. 28 Sep. 2017] Prof. Eunsung Lee/Department of Chemistry, POSTECH and Center for Self–assembly and Complexity, Institute for Basic Science (IBS), Pohang, Republic of Korea||Prof. Eunsung Lee||Thu. 28 Sep. 2017|
|34||[Thu. 14 Sep. 2017] Prof. Dokyoung Kim/Department of Anatomy and Neurobiology, Kyung Hee University, Seoul||Prof. Dokyoung Kim||Thu. 14 Sep. 2017|
|33||7th Jilin-Korea-Waseda Alliance Annual Symposium||-||August 17 ~ 19, 2017|
|32||[Wed. 5 July. 2017] Seminar is canceled!||-||-|
|31||[Fri. 16 Jun. 2017] Prof. Martin Thuo/Department of Materials Science and Engineering, Iowa State University, USA||Prof. Martin Thuo||Fri. 16 Jun. 2017|
|30||[Thu. 8 Jun. 2017] Prof. Won-jin Chung/Department of Chemistry, GIST, Gwangju, Republic of Korea||Prof. Won-jin Chung||Thu. 8 Jun. 2017|
|29||[Thu. 1 Jun. 2017] Prof. Jong-Man Kim/Department of Chemical Engineering, Hanyang University, Seoul, Korea||Prof. Jong-Man Kim||Thu. 1 Jun. 2017|
|28||[Thu. 25 May. 2017] Prof. Wonsuk Kim/Department of Chemistry and Nano Science, Ewha Womans University, Seoul||Prof. Wonsuk Kim||Thu. 25 May. 2017|
|27||[Thu. 18 May. 2017] Student Host Colloquium : 1,1-Bisborylalkane: New Class of Organoboron Compound for the Chemo, Regio and Stereoselective Organic Transformations||Prof. Seung Hwan Cho||Thu. 18 May. 2017|
|26||[Thu. 11 May. 2017] Prof. Andreas Heinrich/IBS Research, Center for Quantum Nanoscience, Seoul, South Korea||Prof. Andreas Heinrich||Thu. 11 May. 2017|
|25||[Thu. 27 Apr. 2017] Seminar was canceled!||-||-|
|24||[Thu. 13 Apr. 2017] Dr. Wan Ki Bae/Photoelectronic Hybrid Research Center, Korea Institute of Science and Technology, Seoul, Korea||Dr. Wan Ki Bae||Thu. 13 Apr. 2017|
|23||[Thu. 6 Apr. 2017] Prof. Rong-Jie Chein/Institute of Chemistry, Academia Sinica, Nankang, Taipei, Taiwan||Prof. Rong-Jie Chein||Thu. 6 Apr. 2017|
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