Magnetism, electronic state, and local structure of iron-containing organometallic polymers.
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概要
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Schiff-base polymers were synthesized by the reaction of 2,6-pyridinedicarbaldehyde with 1,4-butane-, 1,6-hexane-, 1,8-octane-, and 1,12-dodecanediamine. Each of the polymers, when combined with iron(II) sulfate or iron(II) chloride, exhibited anomalously large magnetization and a nonlinear relation of the magnetization curve at room temperature. These iron-containing solids were found to be amorphous and, hence, the local structures around the iron atoms in the compounds were determined by the measurements of Fe K-edge X-ray absorption spectra. It was found that the iron atoms were each surrounded by six nitrogen atoms with the almost equivalent distance of 1.93±0.02Å. This was consistent with a possible geometry in which the tridentate ligand moieties of the polymers were coordinated with the iron atoms in a ratio 2 : 1. It was also found from the results of X-ray photoelectron and Mössbauer spectroscopies that the iron atoms in the solid obtained from the reaction between poly(2,6-pyridinediylmethylidynenitrilohexamethylenenitrilomethylidyne) and iron(II) sulfate were in two valence states consisted of the high spin (<I>S</I>=5⁄2) irons(III) which were responsible for the observed magnetism and the low-spin (<I>S</I>=0) irons(II) which gave no contribution to the magnetism.
- 公益社団法人 日本化学会の論文
著者
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Nomura Masaharu
Photon Factory High Energy Accelerator Research Organization (kek)
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Ohta Toshiaki
Photon Factory National Laboratory For High Energy Physics
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Kinoshita Minoru
The Institute For Solid State Physics The University Of Tokyo
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Sugano Tadashi
The Institute for Solid State Physics, The University of Tokyo
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Awaga Kunio
The Institute for Solid State Physics, The University of Tokyo
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Kieng Poh
The Institute for Solid State Physics, The University of Tokyo
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