Journal of the Korean Magnetic Resonance Society (한국자기공명학회논문지)

Korean Magnetic Resonance Society (한국자기공명학회)
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Molecular Motions of [N(C2H5)4]+ and [N(CH3)4]+ ions by 1H Nuclear Magnetic Resonance Relaxation in [N(C2H5)4]2CoCl4 and [N(CH3)4]2CoCl4 Single Crystals

  • Yoon, Su-A (Department of Science Education, Jeonju University) ;
  • Lim, Ae-Ran (Department of Science Education, Jeonju University)
  • Received : 2011.11.08
  • Accepted : 2011.12.01
  • Published : 2011.12.20
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Abstract

The line widths and spin-lattice relaxation times of protons in $[N(C_2H_5)_4]_2CoCl_4$ and $[N(CH_3)_4]_2CoCl_4$ single crystals were investigated in the temperature range 160-400 K. The temperature dependences of the spin-lattice relaxation times are attributed to the molecular motions of the ethyl and methyl groups in the $[N(C_2H_5)_4]^+$ and $[N(CH_3)_4]^+$ ions respectively. The NMR line widths indicate that the ethyl groups in $[N(C_2H_5)_4]_2CoCl_4$ have one more degree of freedom than the methyl groups in $[N(CH_3)_4]_2CoCl_4$. The experimental results are interpreted in terms of the reorientations of the methyl and ethyl groups.

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References

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