2019年4月25日韩国延世大学Dongho Kim教授学术报告

报告人简介： Dongho Kim，韩国延世大学化学系Underwood杰出教授，2002年当选韩国科学院院士。1980年本科毕业于韩国首尔大学化学系，1984年博士毕业于美国华盛顿大学化学系。1984-1986年在华盛顿大学作研究助理，1986-2000年韩国标准与科学研究所任研究员。曾任韩国超快光学特性控制中心主任，纳米生物分子组装研究所主任，智能纳米共轭中心主任。常年担任Journal of Physical Chemistry，Journal of Porphyrins and Phthalocyanines等期刊的编委。2004年起担任Bulletin of the Korean Chemical Society 的高级编辑，2018年起担任International Journal of Molecular Sciences杂志的主编。2009年，获得韩国“100项国家研究与开发卓越成就“，2015，2016年连续两连获得韩国科学院颁发的“S-oil杰出论文奖”，2017年再度获得韩国“100项国家研究与开发卓越成就“中最佳成就奖（自然科学院和仪器领域）。2018年获得韩国化学会颁发的“杰出学术奖”。至今已在 Nature Chemistry, J. Am. Chem. Soc., Angew. Chem. Int. Ed., Chem. Soc. Rev, Chemical Science等国际著名期刊上发表了超过526篇高水平论文，总引用次数高达24935，H-ide为86。

报告摘要 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 (Hückel’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.