Document Detail


Superexchange-like interaction of encaged molecular oxygen in nitrogen-doped water cages of clathrate hydrates.
MedLine Citation:
PMID:  22060726     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Clathrate hydrates are a highly prospective material in energy and environmental fields, but the inherent nature of inclusion phenomena occurring in the stacked water cages has not been completely resolved yet. Investigating the magnetism of guest molecules is a new experimental approach in clathrate hydrate research to open possibility of icy magnetic applications as a novel material as well as to understand the unrevealed host-guest interactions in icy inclusion compounds. In this study, we observed an indirect spin coupling between encaged dioxygen molecules via a nonmagnetic water framework through the measurement of guest magnetization. This spin coupling is reminiscent of superexchange coupling between magnetic ions through intervening oxygens in antiferromagnetic oxides such as MnO and CoO. Theoretical calculations revealed that OH- incorporated in the framework induced the mixing of perpendicular p* orbitals of two distant dioxygens and that ammonia doping into the hydrate cage leads to longer lifetime of that orientation.
Authors:
Kyuchul Shin; Minjun Cha; Wonhee Lee; Hyungjun Kim; Yousung Jung; Joonghoe Dho; Jinkwon Kim; Huen Lee
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-7
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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