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Study on Relationship between Molecular Structures and Exchange Couplings in Magnetic Materials Having 4f-3d, 3d-3d, and 3d-2p Spins
https://uec.repo.nii.ac.jp/records/1141
https://uec.repo.nii.ac.jp/records/11413ba12132-c9d8-45a6-95c9-b34ae51c40bf
名前 / ファイル | ライセンス | アクション |
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9000000341.pdf (12.0 MB)
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Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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公開日 | 2009-03-24 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Study on Relationship between Molecular Structures and Exchange Couplings in Magnetic Materials Having 4f-3d, 3d-3d, and 3d-2p Spins | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||
資源タイプ | thesis | |||||
その他(別言語等)のタイトル | ||||||
その他のタイトル | 4f-3d, 3d-3d および3d-2p スピンを有する磁性材料における分子構造と交換相互作用の相関についての研究 | |||||
言語 | ja | |||||
著者 |
岡澤, 厚
× 岡澤, 厚 |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | This thesis describes relationship between the molecular structure and the exchange interaction,which characterizes nature of molecular magnetic materials. Determination of magnetic exchangecoupling is one of the most important issues in the study of magnetic clusters.The contents are mainly divided into the three following subjects.(i) Exchange couplings between lanthanoid ion (4f spin) and transition-metal ion (3d spin)(ii) Exchange couplings between transition-metal ion and organic free radical (2p spin)(iii) Exchange couplings between homo transition-metal ionsThe purpose of Subject (i) is as follows. The exchange couplings between a lanthanide ion anda transition-metal ion have been only roughly determined by means of pulsed-field magnetizationmeasurements. We applied a high-frequency (HF)-EPR technique to the 4f-3d hetelometallic SMMs,which has never been utilized for such purpose before our work.The determination of exchange couplings between 4f- and 3d-spins in [Dy2Cu] and [Dy2Ni]SMMs is demonstrated. The one-dimensional compound [Dy2Cu2]n showed SMM behavior and twoDy-Cu exchange parameters were precisely evaluated. The study on isomorphous [Ln2Cu2]n (Ln =Gd, Tb, Dy, Ho, and Er) revealed that the J4f-3d value monotonically decreased in the order ofincreasing the number of the 4f-electrons.The purpose of Subject (ii) is to establish strongly ferromagnetic couplings in the metal-radialhybrid systems. 3d- and 2p-spins seem to be promising for development of strongly correlatedmagnetic materials, in comparison with 4f-spins.A simple magneto-structure relationship in copper(II) and nickel(II) complexes chelated withtert-butyl 2-pyridyl nitroxide radicals was proposed. tert-Butyl 2-pyridyl nitroxide, known to beunisolable under ambient conditions, was successfully utilized in this work. Furthermore, synthesis,crystal structures, and magnetic properties of the two novel stable nitroxide and its coordinationcompounds are presented.The purpose of Subject (iii) is to construct homometallic spin systems showing ferromagneticcouplings. Heterometallic approaches have a disadvantage of potential difficulty in preparation,because of possible metal-scrambling and low positional selectivity. Facile preparation is desired.Magnetic interactions between 3d-3d spins connected with a spiro-bridge were investigated.Intramolecular 3d-3d couplings are ferro- and antiferromagnetic for the dinuclear nickel(II) andmanganese(II) complexes, respectively. This finding can be explained in terms of the orthogonalarrangement of SOMO-SOMO orbitals. | |||||
学位名 | ||||||
学位名 | 博士(理学) | |||||
学位授与機関 | ||||||
学位授与機関名 | 電気通信大学 | |||||
学位授与年度 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 2008 | |||||
学位授与年月日 | ||||||
学位授与年月日 | 2009-03-24 |