Chinese Journal of Magnetic Resonance

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Determination of 1H-27Al Dipolar Coupling Constant by 1H/27Al S-RESIDOR Experiment under Fast MAS

HE Yi-yan2,  WANG Xiu-mei1,3,  LI Fang2*,  CHEN Lei1*   

  1. 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
  • Received:2012-03-14 Revised:2012-04-23 Online:2013-03-05 Published:2013-03-05
  • Contact: Chen Lei,Tel: 027-87199737,E-mail:chenlei@wipm.ac.cn;Li Fang,Tel:027-67867961,E-mail:f.li@mail.ccnu.edu.cn. E-mail:chenlei@wipm.ac.cn;f.li@mail.ccnu.edu.cn
  • About author:何义艳(1985-),女,河南信阳人,硕士研究生,现从事固体核磁共振应用研究.
  • Supported by:

    国家自然科学基金资助项目(10804122,31100267).

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.

Key words: NMR, S-RESIDOR, dipolar coupling constant, mordenite

CLC Number: