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철원소를 함유한 분자기반 생체물질 나노입자들의 연 x선 방사광 분광 연구
이은숙(Eunsook Lee),김대현(D. H. Kim),황지훈(Jihoon Hwang),이기호(Kiho Lee),강정수(J.-S. Kang) 한국자기학회 2012 한국자기학회지 Vol.22 No.4
By employing soft x-ray absorption spectroscopy (XAS) and soft x-ray magnetic circular dichroism (XMCD), the electronic structures of molecule-based nano bioparticles, such as Helicobacter pylori ferritin (H. pylori ferritin), Heme, NaM[Fe(CN)?] · H₂Otype Prussian Blue (M=Co, Ni) analogue, have been investigated. The measured Fe 2p XAS spectra reveal that Fe ions are trivalent (Fe<SUP>3+</SUP>) in H. pylori ferritins, while they are in the Fe<SUP>2+</SUP>-Fe<SUP>3+</SUP> mixed-valent states in NaM[Fe(CN)6] · H2O Prussian Blue analogues (M=Co, Ni). According to the Fe 2p XMCD spectrum of high-state H. pylori ferritin, all the Fe<SUP>3+</SUP> ions have the same local symmetry and their magnetic moments are aligned in the same direction. It is also found that the Fe 3d orbitals in NaM[Fe(CN)?] · H₂O have a strong covalent bonding to (CN)? ligands, but with a very weak bonding to the 2p orbitals of O ligands.