| D-和L-丙氨酸的磁手性相变 |
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| 引用本文： | 王文清,沈新春,龚. D-和L-丙氨酸的磁手性相变[J]. 物理化学学报, 2008, 24(5): 743-748. DOI: 10.1016/S1872-1508(08)60031-5 |
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| 作者姓名： | 王文清 沈新春 龚 |
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| 作者单位： | Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; Medical College of Tsinghua University, Beijing 100084, P. R. China |
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| 基金项目： | 国家重点基础研究发展计划(973计划) , 国家自然科学基金 |
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| 摘 要： | 利用变温直流磁化率测定, 在外加磁场强度为1 T, 磁场平行晶体c轴, 发现在温度270 K, D-和L-丙氨酸发生磁手性相变. 结合中子衍射确定磁手性相变机制为, D-和L-丙氨酸中的(N+H)有类金属氢原子特性, 在相变点270 K, 由(N+H)释放的电子自旋有磁手性. 用变温偏振拉曼光谱进一步证明, D-丙氨酸中的(N+H)的电子自旋(↑), 而L-丙氨酸中的电子自旋(↓), 处于高低不同的能态.磁手性相变(宇称和时间反演都破缺)能差为10-4-10-5 eV·molecule-1.
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| 关 键 词： | 磁手性相变 D-和L-丙氨酸 直流磁化率 变温偏振拉曼光谱 |
| 收稿时间： | 2007-10-29 |
| 修稿时间： | 2007-10-29 |
Magnetic Chirality Transitions of D- and L-Alanine |
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| WANG Wen-Qing,SHEN Xin-Chun,GONG Yan. Magnetic Chirality Transitions of D- and L-Alanine[J]. Acta Physico-Chimica Sinica, 2008, 24(5): 743-748. DOI: 10.1016/S1872-1508(08)60031-5 |
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| Authors: | WANG Wen-Qing SHEN Xin-Chun GONG Yan |
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| Affiliation: | Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China; Medical College of Tsinghua University, Beijing 100084, P. R. China |
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| Abstract: | Achiral spin state of (N+H) in D- and L-alanine was established by monitoring the temperature dependence of dc-magnetic susceptibility (dc: direct current) under the external magnetic field of 1 T. An intrinsic spin chirality of electrons in the atomic magnetic dipole moment of (N+H) was also supported by polarized Raman spectroscopy. Magnetic chirality was associated with a strongly correlated electron system that was related to spin rigidity. Raman vibrational spectra were unrelated to structural chirality but could reflect spin chirality due to the reversal of motion breaking. The spin transition of (N+H) occured at 270 K without bond breaking but was assisted by an intermediate hydrogen bond elongation, splitting and reformation with NH+3 torsion. The energy difference of spin chirality transitions between D- and L-alanine was around 10-4-10-5 eV·molecule-1. |
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| Keywords: | Magnetic chirality transition D- and L-alanine Direct current magnetic susceptibility Polarized Raman spectroscopy |
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