| Studies of Molecular Motions of Ocotillol-Type Saponins in Solution by ~(13)C Nuclear Magnetic Relaxation |
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| 作者姓名： | 杨延武 晏欣 许肖龙 王德华 钱保功 |
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| 作者单位： | Institute of Polymer Chemistry，Nankai University，Tianjin 300071，PRC，State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Wuhan Institute of Physics，Academia Sinica，Wuhan 430071，PRC，State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Wuhan Institute of Physics，Academia Sinica，Wuhan 430071，PRC，State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Wuhan Institute of Physics，Academia Sinica，Wuhan 430071，PRC，State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics，Wuhan Institute of Physics，Academia Sinica，Wuhan 430071，PRC |
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| 基金项目： | Project supported by the National Natural Science Foundation of China and the State Key Laboratory of Applied Organic Chemistry, Lanzhou University. |
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| 摘 要： | In this paper, the fully anisotropicoverall tumbling motions and side groups internal rotation of ocotillol-type saponins separated from the leaves of Panax Quidquefolium L. are investigated by ~(13)C nuclear magnetic relaxation. The fully anisotropic overall tumbling motion model with methyl conformation jumps internal rotation among three equivalent sites is presented, and the spectral density function of this model is derived. The rotation rates for overall tumbling motions to ocotillol-type saponins (OTS) are computed by Woessner's fully anisotropic overall tumbling motion model, and the internal rotation rate and barrier for side groups in OTS are calculated using free diffusion internal rotation model, restriction diffusion internal rotation model and conformation jumps internal rotation model, respectively.
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Studies of Molecular Motions of Ocotillol-Type Saponins in Solution by ~(13)C Nuclear Magnetic Relaxation |
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| YANG Yan-Wu.Studies of Molecular Motions of Ocotillol-Type Saponins in Solution by ~(13)C Nuclear Magnetic Relaxation[J].Science in China(Chemistry),1993(12). |
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| Authors: | YANG Yan-Wu |
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| Abstract: | In this paper, the fully anisotropicoverall tumbling motions and side groups internal rotation of ocotillol-type saponins separated from the leaves of Panax Quidquefolium L. are investigated by ~(13)C nuclear magnetic relaxation. The fully anisotropic overall tumbling motion model with methyl conformation jumps internal rotation among three equivalent sites is presented, and the spectral density function of this model is derived. The rotation rates for overall tumbling motions to ocotillol-type saponins (OTS) are computed by Woessner's fully anisotropic overall tumbling motion model, and the internal rotation rate and barrier for side groups in OTS are calculated using free diffusion internal rotation model, restriction diffusion internal rotation model and conformation jumps internal rotation model, respectively. |
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| Keywords: | nuclear magnetic relaxation molecular motion in solution internal rotation of side groups ocotillol-type saponin |
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