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飯島, 隆広 ; 水野, 元博 ; 須原, 正彦 ; 遠藤, 一央
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金沢大学大学院自然科学研究科物質情報解析<br />A method using the 2H-NMR spectra was shown to be useful to study the solid state physics in d
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iamagnetic and paramagnetic compounds and in crystals having a modulated structure. The spectra and T1 of NMR in solids were measured for [M(H2O)6][AB6] crystals to investigate the static and dynamic structure of H2O and [M(H2O)6]2+ as well as the dynamics of the electron spin in the paramagnetic M2+ ion. The physical properties of [M(H2O)6] [AB6] were found to be as follows: (1) The spin-lattice relaxations of the electron spin of M2+ in [M(H2O)6] [SiF6] (M2+ = Fe 2+ , Co2+ , Ni2+) are dominated by the Orbach process, the Orbach process, and the Raman process, respectively. The spin-lattice relaxation of the electron spin of Cu2+ in [Cu(H 2O)6][PtCl6] is caused by jumping between the Jahn-Teller configurations. (2) In [Cu(H2O)6] [PtCl 6], H2O and [Cu(H2O)6]2+ undergo 180° flips and jumping between the different Jahn-Teller configurations, respectively. A weakening of the hydrogen bond O-H⋯Cl upon deuteration results in a lowering of the transition temperature. (3) In [M(H2O)6][SiF6], H2O and [M(H 2O)6]2+ undergo 180° flips and reorientation about the C3, axis, respectively. The order-disorder transition is closely related to a freezing of this reorientation. (4) By elongation of [M(H2O)6]2+ along the C 3 axis, the mobility becomes higher. (5) The disorder of [Fe(H 2O)6]2+ in the high-temperature phase of [Fe(H2O)6][SiF6] is dynamic. Rotational modulation of [Mg(H2O)6]2+ along the C 3 axis exists in the incommensurate phase of [Mg(H2O) 6] [SiF6].
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早川, 和一
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金澤, 裕樹 ; 宮地, 利明 ; 八木, 絢子 ; 吉田, 彩 ; 佐藤, 修 ; Kanazawa, Yuki ; Miyati, Toshiaki ; Yagi, Ayako ; Yoshida, Aya ; Sato, Osamu
概要:
The purpose of our study is to develop and to assess a method to calculate T1 and T2 relaxation times using fast spin-echo (FSE) sequences with two echoes per excitation. On a 1.5-T MRI, dual-echo FSE sequences with different repetition
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times (TR:TR2=2TR1, i.e., TR1=400ms and TR2=800ms) were performed in MnCl2 phantom. Then, we assessed effects of the echo train length (ETL) , effective echo time (TE) , and T2 correction for T1 measurement, when changed each imaging parameter. Besides, we evaluated with comparison between the dual-echo FSE method and mixed sequence. With optimizing FSE imaging parameters, i.e., effective TE, TR, and low ETL, the measurement values of T1 and T2 revealed significantly higher correlation between the dual FSE method and mixed sequence. Moreover, the T2 correction to calculate T1 value could be omitted by shortening first effective TE. The dual-echo FSE method makes it possible to measure T1 and T2 fast and easily and to obtain more detailed information of organizations in human.
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上野, 善道
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飯島, 隆広 ; 水野, 元博 ; 須原, 正彦 ; 遠藤, 一央
概要:
固体NMR法は,物質中の分子やイオンの静的・動的局所構造や常磁性イオンの電子スピンのダイナミクスを調べるのに有効な手法である.本研究では,反磁性化合物と常磁性化合物及び変調構造を有する化合物のNMR解析を可能にし,一般式[M(H_2O)_6
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][AB_6] (M = Mg^<2+>, Mn^<2+>, Fe^<2+>, Co^<2+>, Ni^<2+>; AB_6 = PtCl_6, SiF_6)で表される一連の化合物について,固体NMR法によりH_2O分子や[M(H_2O)_6]^<2+>イオンの静的・動的局所構造及び常磁性M^<2+>イオンの電子スピンのダイナミクスを調べた.分子運動と構造相転移との相関や[M(H_2O)_6]^<2+>イオンの構造と運動性との相関を明らかにした.[M(H_2O)_6]^<2+>イオンのdynamic disorder構造や変調構造も解析された. A method using the ^2H-NMR spectra was shown to be useful to study the solid state physics in diamagnetic and paramagnetic compounds and in crystals having a modulated structure. The spectra and T_1 of NMR in solids were measured for [M(H_2O)_6][AB_6] crystals to investigate the static and dynamic structure of H_2O and [M(H_2O)_6]^<2+> as well as the dynamics of the electron spin in the paramagnetic M^<2+> ion. The physical properties of [M(H_2O)_6][AB_6] were found to be as follows: (1) The spin-lattice relaxations of the electron spin of M^<2+> in [M(H_2O)_6][SiF_6] (M^<2+> = Fe^<2+>, Co^<2+>, Ni^<2+>) are dominated by the Orbach process, the Orbach process, and the Raman process, respectively. The spin-lattice relaxation of the electron spin of Cu^<2+> in [Cu(H_2O)_6][PtCl_6] is caused by jumping between the Jahn-Teller configurations. (2) In [Cu(H_2O)_6][PtCl_6], H_2O and [Cu(H_2O)_6]^<2+> undergo 180° flips and jumping between the different Jahn-Teller configurations, respectively. A weakening of the hydrogen bond O-H…Cl upon deuteration results in a lowering of the transition temperature. (3) In [M(H_2O)_6][SiF_6], H_2O and [M(H_2O)_6]^<2+> undergo 180°flips and reorientation about the C_3 axis, respectively. The order-disorder transition is closely related to a freezing of this reorientation. (4) By elongation of [M(H_2O)_6]^<2+> along the C_3 axis, the mobility becomes higher. (5) The disorder of [Fe(H_2O)_6]^<2+> in the high-temperature phase of [Fe(H_2O)_6][SiF_6] is dynamic. Rotational modulation of [Mg(H_2O)_6]^<2+> along the C_3 axis exists in the incommensurate phase of [Mg(H2_O)_6][SiF_6].
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三盃, 隆一
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金沢大学外国語教育研究センター
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淺木, 愼一
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上条, 勇
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