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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 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
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50 [March 20, 2019] Challenges in molecular dynamics simulations of unfolded proteins and protein-DNA complexes file Dr. Jejoong Yoo March 20, 2019
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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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