XANES Analysis of Phthalocyanine Molecular Conductor

抄録

The dicyano(phthalocyaninato)iron molecular conductor shows the Giant Magnetoresistance (GMR) effect. In order to investigate the effect of the molecular structure and charge on the X-ray absorption in the Fe(Pc)(CN)₂ molecule, we measured the Fe K-edge X-ray Absorption Near Edge Structure (XANES) spectra in the TPP[Fe(Pc)L₂]₂ (L=CN, Br, and Cl), DMDP[Fe(Pc)(CN)₂], and [(n-C₇H₁₅)₄N][Fe(Pc)(CN)₂]. In 7134-7152 eV, we found the clear difference in the XANES spectra between these Fe(Pc)(CN)₂ compounds. Our multiple scattering calculations indicate that the local structure of the iron and CN ligand, which tends to be changed by the nominal charge in the Pc ring, causes the spectral change. [DOI: 10.1380/ejssnt.2012.92]