Methyl Rotation in 1,3,5-Trichloro-2,4,6-trimethylbenzene as Studied by Nuclear Magnetic Resonance: A Comparison with Merthyl Rotation in Hexamethlbenzene

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概要

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• The spin-lattice relaxation rate and the line shape of proton NMR of 1,3,5-trichloro-2,4,6-trimethylbenzene were measured between 1.8 and 430 K. Two maximaof the spin-lattice relaxation rate were clearly distinguished at 36.4 and 19.0 K. Themaxima are ascribed to fluctuation of intramethyl and intermccthyl dipole interactionsdue to methyl rotation. The activation energy of' the roLaLic?n of the methyl groupover the potential barrier is 2.4 kJ mol ' and the tunneling f'requency of the methylgroup was estimated to be 830 MHz at 36 K. In comparison with the methyl rotationin hexamethylbenzene, the alternate substitution of three chlorine atoms for the threemethyl groups substantially reduces the potential barrier hindering the rotation of themethyl groups.

• 社団法人日本物理学会の論文
• 1989-05-15

著者

• FUJIWARA Takahiro

  Department of Mechanical and Control Engineering, University of Electro-Communications

• Takeda Sadamu

  Department Of Chemistry Faculty Of Science Osaka University

• CHIHARA Hideaki

  Department of Chemistry, Faculity of Science, Osaka University

• Chihara Hideaki

  Department Of Chemistry Faculity Of Science Osaka University

• Fujiwara Takahiro

  Department Of Chemistry Faculty Of Science Osaka University

• Chihara Hideaki

  Department Of Chemistr Faculty Of Science Osaka University

• Fujiwara Takahiro

  Department of Chemistry and Microcalorimetry Research Center, Faculty of Science, Osaka University

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