2014 Fiscal Year Final Research Report
Development of New Molecular Magnetism Based on Dynamical Spin Equilibrium
| Project/Area Number |
26620057
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Functional solid state chemistry
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
OKAZAWA Atsushi 東京大学, 大学院総合文化研究科, 助教 (30568275)
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| Project Period (FY) |
2014-04-01 – 2015-03-31
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| Keywords | 分子磁性 / スピン平衡 / スピンクロスオーバー / 原子価搖動 / 連鎖物性 / 磁気相転移 |
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| Outline of Final Research Achievements |
In this project, we investigated multifunctionalities coupled with the spin equilibrium for (n-CnH2n+1)4N[M(II)Fe(III)(mto)3] (M = Mn, Fe, etc.; mto = C2O3S). In this system, we observed the rapid spin equilibrium phenomenon between the high-spin (HS) and low-spin (LS) states at the Fe(III)O3S3 site in (C6H5)4P[Zn(II)Fe(III)(mto)3], in which the time scale of spin equilibrium was estimated at 10^-10 < τ < 10^-7 sec.
In the case of (C6H5)4P[Mn(II)Fe(III)(mto)3], we observed an anomalous stepwise magnetic phase transitions at 23 and 30 K. At 30 K, the Mn(II) spins are magnetically ordered, while the Fe(III) spins are still paramagnetic. Below 23 K, both of the Mn(II) and Fe(III) spins are ferrimagnetically ordered. In the case of (n-C4H9)4N[Fe(II)Fe(III)(mto)3], we observed that the rapid spin equilibrium of the Fe(III)S3O3 site induces the iron valence fluctuation in (n-C4H9)4N[Fe(II)Fe(III)(mto)3].
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| Free Research Field |
化学
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