Citation: WANG Wen-Qing, SHEN Xin-Chun, ZHANG Yu-Feng, NG Yan. Emergent Paramagnetism in D- and L-Alanine Crystals: Spin-Orbital Separation in Quasi-One-Dimensional N⁺H…O^? Bonds[J]. Acta Physico-Chimica Sinica, ;2013, 29(07): 1396-1400. doi: 10.3866/PKU.WHXB201304163 shu

Emergent Paramagnetism in D- and L-Alanine Crystals: Spin-Orbital Separation in Quasi-One-Dimensional N⁺H…O^? Bonds

WANG Wen-Qing ^1, ,
SHEN Xin-Chun ^1,2 ,
ZHANG Yu-Feng ^1,3 ,
NG Yan ^1,3

1.
1 Beijing National Laboratory for Molecular Sciences, Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China;
2 School of Chemistry and Chemical Engineering, Shandong University, Jinan 250061, P. R. China;
3 Beijing Key Laboratory of Clothing Materials R&D and Assessment, School of Materials Science & Engineering, Beijing Institute of Fashion Technology, Beijing 100029, P. R. China

Received Date: 21 February 2013
Available Online: 16 April 2013
Fund Project: 国家自然科学基金(21002006, 20452002) (21002006, 20452002)国家科技部基础研究重大项目(2004-973-36)资助 (2004-973-36)

We investigated the field-dependent magnetic properties of chiral alanine crystals, especially associated with the electronic orbital motions. Based on the chirality of the zwitterionic model (⁺NH₃-C(CH₃)H-CO₂^-), and the helicity of the lattice structure of peptide bond in proteins, when an external field of +5 T was applied parallel to the preferred axis c(z) of the N⁺H…O^- hydrogen bond in D-alanine, the electron spin-flip manifested emergent paramagnetism at 297.6 K. Because the spin magnetic dipole moment of hydrogen in L-alanine was originally aligned antiparallel to the field, the electron spins flipped firstly perpendicular to the field then manifested paramagnetism at 303.9 K. The magnetic field of 5 T split a degenerate energy level in the paramagnetic state of chiral alanine. Furthermore, the spin-orbital separation of the quasi-one dimensional N⁺H…O^- hydrogen bond in the crystal lattice provided evidence for the hallmark of one-dimensional physics.
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Emergent Paramagnetism in D- and L-Alanine Crystals: Spin-Orbital Separation in Quasi-One-Dimensional N+H…O? Bonds

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通讯作者: 陈斌, bchen63@163.com

Emergent Paramagnetism in D- and L-Alanine Crystals: Spin-Orbital Separation in Quasi-One-Dimensional N⁺H…O^? Bonds