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A giant negative magnetoresistance effect in an iron tetrabenzoporphyrin complex
http://hdl.handle.net/2298/38561
http://hdl.handle.net/2298/3856131ef2f63-3b37-4f45-b3ef-77496e4244a7
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
DaltonRevised_repository.pdf (2.4 MB)
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| Item type | プレプリント / Preprint(1) | |||||
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| 公開日 | 2017-11-17 | |||||
| タイトル | ||||||
| タイトル | A giant negative magnetoresistance effect in an iron tetrabenzoporphyrin complex | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ | other | |||||
| 著者 |
西, 美樹
× 西, 美樹× 池田, 光雄× Kanda, Akinori× 花咲, 徳亮× 星野, 哲久× 芥川, 智行× 松田, 真生 |
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| 内容記述 | ||||||
| 内容記述 | By measuring the electrical resistivity in TPP[FeIII(tbp)(CN)2]2 (TPP = tetraphenylphosphonium and tbp = tetrabenzoporphyrin) under the application of a static magnetic field, a giant negative magnetoresistance (MR) effect with high anisotropy is observed. More specifically, the MR ratio at 13 K under a field of 9 T perpendicular to the c axis is −70%, whereas the MR ratio under a field parallel to the c axis is −40%. Furthermore, electron spin resonance (ESR) measurements indicate large anisotropy in the principal g-values of d spin (S = 1/2) in the [FeIII(tbp)(CN)2] unit; the g1 value almost perpendicular to the tbp plane and the g2 and g3 values almost parallel to the tbp plane are 3.60, 1.24, and 0.39, respectively. It is revealed that the anisotropy in the MR effect arises from the anisotropy in the d spin, suggesting that the d spins in TPP[FeIII(tbp)(CN)2]2 affect the π-conduction electron via the intramolecular π–d interaction. The anisotropy and magnitude in the giant negative MR effect for TPP[FeIII(tbp)(CN)2]2 are smaller than the corresponding values for the isostructural phthalocyanine (Pc) analogue TPP[FeIII(Pc)(CN)2]2. This is consistent with the fact that the intermolecular antiferromagnetic d–d interaction in TPP[FeIII(tbp)(CN)2]2 (suggested by the Weiss temperature: Θ = −8.0 K) is weaker than that in TPP[FeIII(Pc)(CN)2]2 (Θ = −12.3 K). This indicates that the minor modification in coordination complexes can significantly affect the MR effect via tuning the intermolecular d–d interaction as well as the intermolecular π–π overlap. | |||||
| 書誌情報 |
en : Dalton Transactions 巻 45, p. 16604-16609, 発行日 2016-11-14 |
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| ISSN | ||||||
| 収録物識別子 | 1477-9226 | |||||
| DOI | ||||||
| 関連タイプ | isVersionOf | |||||
| 関連識別子 | https://doi.org/10.1039/C6DT01911K | |||||
| 著者版フラグ | ||||||
| 出版タイプ | AO | |||||
| 出版タイプResource | http://purl.org/coar/version/c_b1a7d7d4d402bcce | |||||
| 日本十進分類法 | ||||||
| 主題Scheme | NDC | |||||
| 主題 | 427 | |||||
| 出版者 | ||||||
| 出版者 | Royal Society of Chemistry | |||||
| 言語 | en | |||||
