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제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Metal Catalyst-Chromophore Assembly for Visible-Light Driven Photosynthetic Energy Conversion

2018년 1월 24일 16시 10분 47초
INOR2-3 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 09시 : 50분
Inorganic Chemistry - Bioinspired Inorganic Catalysis
저자 및
Jinheung Kim
Chemistry Department of Nano-Science, Ewha Womans University, Korea
Artificial photosynthesis is a green technology that can convert the solar energy into the solar fuel such as hydrogen by driving high-energy chemical reactions. In order to fabricate artificial photosynthetic systems, efficient visible light-absorbing materials have to link reduction and oxidation catalysts for an efficient energy flow. A various strategies of chromophore-catalyst assemblies have been investigated and the simplest assembly strategy is co-loading the chromophore and catalyst on the oxide surface with chromophore injection followed by cross-surface electron transfer activation of the catalyst. As a step toward this goal of an NADH regeneration system and enzymatic production of solar fuels from CO2, we studied the synthesis of a new polydiacetylene compound that is covalently connected with [Ru(phen-NH2)(bpy)2]2+. The [(bpy)2Ru(phen)]-polydiacetylene absorbed a wide range of visible light because of the presence of two chromophores, the Ru complex and polydiacetylene. The electron transfer from the photoexcited [Ru(phen)(bpy)2]2+ to the polydiacetylene backbone was observed. In a visible light-driven photocatalytic NAD+ reduction by (cyclopentadienyl)Rh(bpy)(H2O)2+ with [(bpy)2Ru(phen)]-polydiacetylene, NADH was regenerated, and the reactivity using Ru(bpy)2(phen)-polydiacetylene was enhanced relative to control experiments using only [Ru(phen)(bpy)2]2+ or polydiacetylene. The consecutive carbon dioxide reduction coupled with formate dehydrogenase was carried out to utilize the in-situ photoregenerated NADH catalytically. Bulk electrolysis of NAD+ carried out with a Rh catalyst in the absence and presence of platinum nanoparticles (PtNPs) generates enzymatically active NADH.