Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Spectroscopic Identification of Isomeric Trimethylbenzyl Radicals Generated from 1,2,3,4-Tetramethylbenzene

  • Yoon, Young-Wook (Department of Chemistry and The Chemistry Institute for Functional Materials, Pusan National University) ;
  • Lee, Sang-Kuk (Department of Chemistry and The Chemistry Institute for Functional Materials, Pusan National University)
  • Received : 2011.05.31
  • Accepted : 2011.07.08
  • Published : 2011.08.20
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Abstract

The visible vibronic emission spectrum was recorded from the corona discharge of precursor 1,2,3,4-tetramethylbenzene with a large amount of inert carrier gas helium using a pinhole-type glass nozzle coupled with corona excited supersonic expansion. The spectrum showed a series of vibronic bands in the $D_1{\rightarrow}D_0$ electronic transition of jet-cooled benzyl-type radicals formed from the precursor in a corona excitation. The analysis confirmed that two isomeric radicals, 2,3,4- and 2,3,6-trimethylbenzyl radicals, were produced as a result of removal of a hydrogen atom from the methyl group at different substitution positions. For each isomeric product, the electronic transition and a few vibrational mode frequencies were determined in the ground electronic state.

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References

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