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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.

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66 [August 14. 2019] Principle of Semiconductor Quantum Cascade Laser and It’s Application to Chemical Gas Detection file Dr. Byeong-il Seo(Agency for Defense Development) Wed. 14 August. 2019
65 [July 11. 2019] Coordination Chemistry in 19F Magnetic Resonance Imaging: Agents for Illuminating Biological Environments in Vitro and in Vivo file Prof. Emily Que(The University of Texas at Austin) Thu. 11 July. 2019
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63 [May 23. 2019] Molecular Engineering for Organic Electronics and Synchrotron X-rays Prof. Hyojung Kim (Pusan National University) Thu. 23 May. 2019
62 [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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60 [May 2. 2019] Theoretical studies of organic molecules in OLEDs: From chemical stability to the excited-state nature Prof. Dongwook-kim (Kyonggi University) Thu. 2 May. 2019
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57 [March 28. 2019] NMR Structural Studies of engineered novel antimicrobial peptides Prof. Yongae Kim (Hankuk University of Foreign Studies) Thu. 28 Mar. 2019
56 [March 21, 2019] Nanomaterials Design for Energy Conversion and Storage Prof. Jong-Hyuk Park (Yonsei University) Thu. 21 Mar. 2019
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» [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
50 Fall semester 2018 Seminar Schedule file - -
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
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