122nd General Meeting of the KCS

Type Poster Presentation
Area Physical Chemistry
Room No. Grand Ballroom
Time 10월 19일 (금요일) 11:00~12:30
Code PHYS.P-224
Subject Detecting Low Concentrations of Unsaturated C-C Bonds by Parahydrogen-Induced Polarization using an Efficient Home-Built Parahydrogen Generator
Authors Sein Min, Heelim Chae, Sung-keon Namgoong 1, Keunhong Jeong2,*
Department of Chemistry, Seoul Women's university, Korea
1Department of Chemistry, Seoul Women's University, Korea
2Department of Chemistry, Korea Military Academy, Korea
Abstract Parahydrogen has great potential as a hyperpolarization source. To achieve the hyperpolarized parahydrogen, heat exchanger in ultra-low temperature is the essential part and low temperature is normally sustained by wasteful liquid nitrogen. To save the liquid nitrogen in this home-built parahydrogen generator, we utilized the cryogenic storage dewar and it lasted more than 20 days in a single fueling. A principle-based experiment, identifying small concentration of unsaturated bond compound in mixture by using hyperpolarization and phase difference, was carried out by hydrogenation reaction. Lower than 1 μl styrene in 1 ml chloroform was identified by a single scan of 43 MHz Benchtop NMR after hydrogenation reaction via 50% parahydrogen. This method could be developed with great potential such as using high field NMR, higher parahydrogen concentration, and more scan time to collect data etc. Because hydrogenation reaction by parahydrogen induce reversed phase in attaching on the unsaturated C-C bond, many other unsaturated bonds in organic molecules might be used for detection. This study will not only broaden the parahydrogen-based unsaturated bond detecting study but also hyperpolariazation study on many researchers by providing the long time lasting system of home-built parahydrogen generator
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