| 高转速下采用S-RESIDOR方法测量1H-27Al偶极偶合常数 |
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| 引用本文： | 何义艳,王秀梅,李芳,陈雷.高转速下采用S-RESIDOR方法测量1H-27Al偶极偶合常数[J].波谱学杂志,2013,30(1):93-102. |
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| 作者姓名： | 何义艳 王秀梅 李芳 陈雷 |
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| 作者单位： | 华中师范大学化学学院,湖北武汉,430079;波谱与原子分子物理国家重点实验室,武汉磁共振中心(中国科学院武汉物理与数学研究所),湖北武汉430071;中国科学院大学,北京100049;波谱与原子分子物理国家重点实验室,武汉磁共振中心(中国科学院武汉物理与数学研究所),湖北武汉430071 |
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| 基金项目： | 国家自然科学基金资助项目(10804122,31100267) |
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| 摘 要： | 提出利用S-RESIDOR(Symmetry-based Resonance Echo Saturation Irradiation DOuble Resonance)方法测量1H-27Al偶极偶合常数. 通过理论模拟，讨论了四极作用常数、饱和照射脉冲功率、照射时间对1H/27Al S-RESIDOR实验的影响. 发现四极作用常数对1H/27Al S-RESIDOR偶极去相曲线影响较小，中等强度的饱和照射功率即能满足实验要求. 高转速下，在氢型丝光沸石上进行了1H/27Al S-RESIDOR实验，测量得到Br-nsted酸位上的 1H与骨架上27Al的偶极偶合常数为874 Hz.
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| 关 键 词： | 核磁共振(NMR) S-RESIDOR 偶极偶合常数 丝光沸石 |
| 收稿时间： | 2012-03-14 |
Determination of 1H-27Al Dipolar Coupling Constant by 1H/27Al S-RESIDOR Experiment under Fast MAS |
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| HE Yi-yan,WANG Xiu-mei,LI Fang,CHEN Lei.Determination of 1H-27Al Dipolar Coupling Constant by 1H/27Al S-RESIDOR Experiment under Fast MAS[J].Chinese Journal of Magnetic Resonance,2013,30(1):93-102. |
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| Authors: | HE Yi-yan WANG Xiu-mei LI Fang CHEN Lei |
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| Affiliation: | 1. State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance (Wuhan Institute of Physics and Mathematics, Chinese Academy of Science), Wuhan 430071, China; ;
2. College of Chemistry, Central China Normal University, Wuhan 430079, China; ;
3. University of Chinese Academy Science, Beijing 100049, China |
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| Abstract: | A Symmetry-based Resonance Echo Saturation Irradiation DOuble Resonance (S RESIDOR) method is proposed for measuring 1H-27Al dipolar coupling constant in zeolite. The influence of 27Al Cq value, υ1 (27Al) and the saturation pulse length of 27Al channel on the 1H/27Al S-RESIDOR experiment were discussed. Numerical simulations indicate that 1H/27Al S-RESIDOR dephasing curves are insensitive to the 27Al quadrupole coupling constant, and moderate RF field can fulfill the experiment requirements. The 1H/27Al S-RESIDOR experiment was performed on H-mordenite under fast spinning speed, and the measured 1H/27Al dipolar coupling constant is 874 Hz. |
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| Keywords: | NMR S-RESIDOR dipolar coupling constant mordenite |
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