|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||Spring semester 2019 Seminar Schedule||-||-|
|63||Fall semester 2018 Seminar Schedule||-||-|
|62||Fall semester 2016 Seminar Schedule||-||-|
|61||Spring semester 2017 Seminar Schedule||-||-|
|60||[Fri. 17 Mar. 2017] 9th RINS Symposium||-||Fri. 17 Mar. 2017|
|59||Fall semester 2017 Seminar Schedule||-||-|
|58||[Thu. 27 Apr. 2017] Seminar was canceled!||-||-|
|57||[Wed. 5 July. 2017] Seminar is canceled!||-||-|
|56||7th Jilin-Korea-Waseda Alliance Annual Symposium||-||August 17 ~ 19, 2017|
|55||[October 10, 2017] Novel Terahertz Spectroscopies||Director Mischa Bonn||Tue, October 10, 2017|
|54||[October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences||Dr. Byung-Kuk Yoo||October 25, 2017|
|53||[March 5. 2019] Innovation@Agilent||Dr. Darlene Solomon (Agilent Technologies Inc.)||Tuesday. 5 March. 2019|
|52||[May 16. 2019] Nano Structure Analysis by Synchrotron Small Angle X-ray Scattering Technique||Dr. Hyungjoo-An (Pohang Accelerator Laboratory)||Thu. 16 May. 2019|
|51||[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|
|50||[March 20, 2019] Challenges in molecular dynamics simulations of unfolded proteins and protein-DNA complexes||Dr. Jejoong Yoo||March 20, 2019|
|49||[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|
|48||[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|
|47||[Mon. 13 Oct. 2016] Prof. Amir H. Hoveyda/Multicomponent Catalytic Synthesis of Organoboron Compounds for Scalable Natural Product Synthesis||Prof. Amir H. Hoveyda||Monday 13 October 2016|
|46||[Thu. 11 May. 2017] Prof. Andreas Heinrich/IBS Research, Center for Quantum Nanoscience, Seoul, South Korea||Prof. Andreas Heinrich||Thu. 11 May. 2017|
|45||[Thu. 22 Sep. 2016] Prof. Anna Lee/Organocatalyzed Asymmetric Reactions||Prof. Anna Lee||Thursday 22 September 2016|
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