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http://dx.doi.org/10.6564/JKMRS.2017.21.4.139

Synthesis of α-oximinoketones, Precursor of CO2 Reduction Macrocyclic Coenzyme F430 Model Complexes  

Kim, Gilhoon (Department of Chemical and Molecular Engineering, Hanyang University)
Won, Hoshik (Department of Chemical and Molecular Engineering, Hanyang University)
Publication Information
Journal of the Korean Magnetic Resonance Society / v.21, no.4, 2017 , pp. 139-144 More about this Journal
Abstract
Ni(II) containing coenzyme F430 catalyzes the reduction of $CO_2$ in methanogen. Macrocyclic Ni(II) complexes with N,O shiff bases have been received a great attention since metal ions play an important role in the catalysis of reduction. The reducing power of metal complexes are supposed to be dependent on oxidoreduction state of metal ion and structural properties of macrocyclic ring moiety that can enhance electrochemical properties in catalytic process. Six different ${\alpha}$-oximinoketone compounds, precursor of macrocyclic ligands used in $CO_2$ reduction coenzyme F430 model complexes, were synthesized with yields over 90% and characterized by NMR. The molecular geometries of ${\alpha}$-oximinoketone analogues were fully optimized at Beck's-three-parameter hybrid (B3LYP) method in density functional theory (DFT) method with $6-31+G^*$ basis set using the ab initio program. In order to understand molecular planarity and substitutional effects that may enhance reducing power of metal ion are studied by computing the structure-dependent $^{13}C$-NMR chemical shift and comparing with experimental results.
Keywords
Coenzyme F430; Ab initio; NMR; $CO_2$ reduction;
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