XAFS

 
작성일 : 21-06-20 02:27
2021년 6월 22일 오후 4시 XAS Journal Club 온라인 발표
 글쓴이 : 한상욱
조회 : 205  
안녕하세요.
격주로 진행되는 온라인 XAS Journal Club 다음 발표는 아래와 같이 진행됩니다.
 
Date:June 22
Time: 14:00 (Seoul) Syndey(17:00)  Tokyo(16:00)  Beijing (15:00) New Delly (12:30)  Moskow (10:00)  Berlin and Paris (9:00)    London(8:00)

Place: ZOOM from Thailand
Chair: Dr. Wantana Klysubun (SLRI, Thailand)
Speaker: Dr. Suttipong Wannapaiboon (SLRI, Thailand)
Title:  Revealing structural design and defect engineering of Metal-Organic Frameworks and their applications by employing X-ray absorption spectroscopy

Abstract: 
Metal-organic frameworks (MOFs) are novel crystalline porous materials, which combine the rigid, well-defined structures of crystalline inorganic networks and the flexibility and versatility of organic-based moieties as a synergistic unit. The tremendous diversity of precursor components reveals broad perspectives for systematic, bottom-up designs and fine tunings of MOFs framework structures, characteristic features, and chemical properties. Rational design of chemical functionalities and engineering of structural defects within MOF structures provide the mechanistic understanding of controlled phase formation and crystal morphology. Moreover, they also exhibit emerging functional properties, which can be further applied for selective catalysts, and sensing materials. X-ray absorption spectroscopy (XAS) is one of the crucial characterization techniques to examine the detailed structural engineering and the presence of catalytic active sites in MOF structures, especially at the metal clusters. In details, X-ray absorption near-edge structure (XANES) confirms the existing of highly reactive RuII,II centers in Ru-based HKUST-1 analogue MOF. X-ray absorption fine structure (EXAFS) is used to monitor the mechanistic crystalline-phase formation of Zr-based MOFs synthesized by controlled secondary building approach at mild conditions and reveals the presence of both Cr and Fe at the same metal nodes within the mixed-metal MOFs. In additions, EXAFS analysis provides the strong evidence to identify the different local defect concentration within Zr-based MOF, of which plays a crucial role as catalytic active sites for monosaccharide sugar conversion to lactic acid. 

References:
1. W. Zhang, K. Freitag, S. Wannapaiboon, C. Schneider, K. Epp, G. Kieslich, R.A. Fischer, Inorganic Chemistry (2016), 55(24), 12492-12495.
2. A.L. Semrau, S. Wannapaiboon, S.P. Pujari, P. Vervoorts, B. Albada, H. Zuilhof, R.A. Fischer, Crystal Growth & Design (2018), 19(3), 1738-1747.
3. L. Pukdeejorhor, K. Adpakpang, P. Ponchai, S. Wannapaiboon, S. Ittisanronnachai, M. Ogawa, S. Horike, S. Bureekaew, Crystal Growth & Design (2019), 19, 5581-5591.
4. P. Ponchai, K. Adpakpang, S. Thongratkaew, K. Chaipojjana, S. Wannapaiboon, S. Siwaipram, K. Faungnawakij, S. Bureekaew, Chemical Communications (2020), 56, 8019-8022.

We hope all of you make registration through the following g-form and join the meeting.
https://docs.google.com/forms/d/e/1FAIpQLScyZVGEpGgFaAnMMk_ztaoasFrSx4nZ9fl1Ym_v8uVKiQZIlQ/viewform?usp=sf_link