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2018.12.03 11:36

[Thu. 6 Dec. 2018] Prof. Dong-Ho Kim/Department of Chemistry, Yonsei University, Seoul, Korea

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Speaker Prof. Dong-Ho Kim (Yonsei University)
Date Thu. 6 Dec. 2018
Time 5:00pm
Venue #331. Asan Hall. College of Science

A Journey to Molecular Excitonic World

 

Various synthetic strategies have been developed to devise a variety of artificial molecular arrays in molecular photonics because of their similarities in architecture and subunit structures to the natural photosynthetic light-harvesting complexes. For the molecular arrays to be efficient devices, they should have very regular pigment arrangements which allow a facile light energy or charge flow along the array but do not result in the alteration of individual properties of the constituent pigments leading to the formation of energy or charge sink. In these respects, understanding of photophysical properties of these macromolecular architectures is essential for the rational design of molecular devices for photovoltaic, or optoelectronic applications.
Here, we have revealed that the ultrafast excitation energy migration processes in molecular arrays are strongly influenced by the electronic couplings among the constituent molecules as well as the structural rigidity of overall architectures.[1] Our investigations have been extended to H-type aggregated perylenebisimide (PBI)[2] and polythiophene oligomers (linear vs. cyclic)[3]. Not only intermolecular exciton couplings but intramolecular electronic structures have been investigated in a series of expanded porphyrins in conjunction with their molecular structures, the number of π-electrons (Huckel’s [4n+2] rule) as well as their conjugation pathways. Our study demonstrates a relationship between the photophysical properties such as absorption/emission properties, excited state dynamics and the aromaticity of expanded porphyrin systems. Based on these spectroscopic observations, we have found the reversal of aromaticity in the excited states of aromatic/antiaromatic expanded porphyrin congeners.[4] Detailed studies of the modulation events are expected to provide additional fruitful insight into the relationship between (anti)aromaticity and electronic structures. To the extent this proves true, it could have far-reaching practical applications that complement the advances in theoretical understanding that our studies are likely to provide.
 

20181206.jpg

Fig. 1 Excitonic dynamics in various molecular systems

 

Acknowledgement(s) This work was supported by Samsung Science and Technology Foundation under Project Number SSTF-BA1402-10 and the Global Research Laboratory (GRL, 2013K1A1A2A0205183) Program funded by the Ministry of Education, Science and Technology (MEST) of Korea. 
 
References
[1] J. Sung, P. Kim, B. Fimmel, F. Würthner, D. Kim, Nat. Commun., 6 (2015) 8646.
[2] Y. M. Sung, M.-C. Yoon, J. M. Lim, H. Rath, K. Naoda, A. Osuka, D. Kim, Nat. Chem., 7
     (2015) 418-422.
[3] Y. M. Sung, J. Oh, W.-Y. Cha, W. Kim, J. M. Lim, M.-C. Yoon, D. Kim, Chem. Rev., 117
     (2017) 2257-2312.
[4] W.-Y. Cha, T. Kim, A. Ghosh, Z. Zhang, X. Ke, R. Ali, V. M. Lynch, J. Jung, W. Kim, S. Lee,
     S, Fukuzumi, J. S. Park, J. L. Sessler, T. K. Chandrashekar, D. Kim, Nat. Chem., 9 (2017)
     DOI:10.1038/nchem.2834.

List of Articles
No. Subject Speaker Date
Notice Fall semester 2018 Seminar Schedule file - -
» [Thu. 6 Dec. 2018] Prof. Dong-Ho Kim/Department of Chemistry, Yonsei University, Seoul, Korea Prof. Dong-Ho Kim (Yonsei University) Thu. 6 Dec. 2018
49 [January 24, 2018] Electro-Optic Organic THz Wave Sources file Prof. O-Pil Kwon(Ajou University) January 24, 2018 (Wednesday)
48 [Thu. 30 Nov. 2017] Prof. Sunmin Ryu/Department of Chemistry, POSTECH, Pohang, South Korea Prof. Sunmin Ryu Thu. 30 Nov. 2017
47 [Thu. 23 Nov. 2017] Prof. Sung-Gon Kim/Department of Chemistry, Kyonggi University, Suwon, Korea Prof. Sung-Gon Kim Thu. 23 Nov. 2017
46 [November 14, 2017] Zero-Point Energy, Fluctuations, and Dissipation : A (Mostly) Quantum-Optical Perspective Prof. Milonni, Peter November 14, 2017
45 [Thu. 16 Nov. 2017] Prof. Hyungjun Kim/Department of Chemistry, and Graduate school of Energy, Environment, Water, and Sustainability (EEWS), KAIST, Daejeon, Korea Prof. Hyungjun Kim Thu. 16 Nov. 2017
44 [Fri. 30 Oct. 2017] Prof. Igor Rodin/Department of Chemistry, Moscow State University, Moscow, Russia Prof. Igor Rodin Fri. 30 Oct. 201
43 [October 31, 2017] New ways of vision: Protein structures in translational medicine and business development, my experience file Prof. Robert Huber(1988 Nobel Prize in Chemistry) October 31, 2017
42 [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
41 [October 25, 2017] Ultrafast electron microscopy: applications in chemical and materials sciences Dr. Byung-Kuk Yoo October 25, 2017
40 [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
39 [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
38 [Thu. 12 Oct. 2017] Student Host Colloquium : Versatile Dendrimer-Encapsulated Nanoparticles for Analytical Applications Prof. Joohoon Kim Thu. 12 Oct. 2017
37 [October 10, 2017] Novel Terahertz Spectroscopies file Director Mischa Bonn Tue, October 10, 2017
36 [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
35 [Thu. 14 Sep. 2017] Prof. Dokyoung Kim/Department of Anatomy and Neurobiology, Kyung Hee University, Seoul Prof. Dokyoung Kim Thu. 14 Sep. 2017
34 Fall semester 2017 Seminar Schedule file - -
33 7th Jilin-Korea-Waseda Alliance Annual Symposium file - August 17 ~ 19, 2017
32 [Wed. 5 July. 2017] Seminar is canceled! - -
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