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2017.09.26 10:33

[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

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Speaker Prof. Eunsung Lee
Date Thu. 28 Sep. 2017
Time 5:00pm
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.

 

Reference

[1] 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.

[2] Song, H.; Kim, Y.; Park, J.; Kim, K.; Lee, E. Synlett. 2016, 27, 477.

[3] Kim, Y.; Kim, K.; Lee, E. submitted.

[4] Back, J.; Park, J.; Y. Kim, Y.; Kim, K.; Lee, E. submitted.


List of Articles
No. Subject Speaker Date
Notice Spring semester 2019 Seminar Schedule file - -
63 Fall semester 2018 Seminar Schedule file - -
62 Fall semester 2016 Seminar Schedule file - -
61 Spring semester 2017 Seminar Schedule file - -
60 [Fri. 17 Mar. 2017] 9th RINS Symposium file - Fri. 17 Mar. 2017
59 Fall semester 2017 Seminar Schedule file - -
58 [Thu. 27 Apr. 2017] Seminar was canceled! - -
57 [Wed. 5 July. 2017] Seminar is canceled! - -
56 7th Jilin-Korea-Waseda Alliance Annual Symposium file - August 17 ~ 19, 2017
55 [October 10, 2017] Novel Terahertz Spectroscopies file 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 file 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 file 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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