Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)

Korean Magnetic Resonance Society (한국자기공명학회)
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Identification of Derivatives of Cobalt-binding BLM-A2 by NMR

  • Lee, Seongeon (Department of Applied Chemistry, Hanyang University) ;
  • Shin, Donghyuk (Department of Applied Chemistry, Hanyang University) ;
  • Woo, Sunhee (Department of Applied Chemistry, Hanyang University) ;
  • Won, Hoshik (Department of Applied Chemistry, Hanyang University)
  • Received : 2012.11.07
  • Accepted : 2012.12.10
  • Published : 2012.12.20
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Abstract

Three different derivatives were obtained in the synthesis of cobalt-binding BLM-A2 and characterized by NMR and Mass spectrometry. It was found that Component 1 is Co(II)($2H_2O$)(BLM-A2), component 2 is Co(III)($OOH^-$)(BLM-A2) and component 3 is Co(III)($H_2O$)($OH^-$)(BLM-A2), respectively. Component 2 and 3 were interestingly dominated when CoBLM-A2 complex was synthesized under basic condition. In this experiment, it was revealed newly that the brown form (component 1) was 6-coordinated structure composed with not 5 ligands but 4 ligands from BLM-A2 and with $2H_2O$ as the axial ligands. The component 3 exhibiting a novel ligand configuration is found, and the structure of component 3 was observed to be very similar to that of component 1 in the kind of their ligands but one of the axial ligand is $OH^-$ instead of $H_2O$. These ligand configurations are different from the green form (component 2) exhibiting 6-coordinate structure composed of 5 ligands from BLM-A2 and one ligand of $OOH^-$, being consistent with former studies.

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References

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