## Abstract Ξ³βIrradiation of tris (methylidene)βcyclopropane (β[3]radialeneβ) **1** in a rigid electron scavenging matrix (butylchoride/iβpentane, 1:1) at 77 K leads to formation of its molecular cation **1**^+^. Slight softening of the matrix by a temperature increase of 3β5 K results in formation
Molecular motion of the radical cations in the condensed phase as studied by ESR: Diazabenzenes
β Scribed by Michio Matsushita; Takamasa Momose; Tatsuhisa Kato; Tadamasa Shida
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 401 KB
- Volume
- 161
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
The radical cation of three diazabenzenes, pyridaxine, pyrimidine, and pyrazine, have heen investigated by ESR in the temperature region of 6-I43 K. The observed spectra changes have been analyzed by the density matrix method with a model of uniaxial rotation of the radicals. A conspicuous difference in the dynamical behavior of the three similar systems is found.
π SIMILAR VOLUMES
Molecular radical cations of oxazole (1) and isoxazole (2) dissociate by losing carbon monoxide or a hydrogen atom, respectively. These fragmentations were examined by use of tandem mass spectrometry, flash vacuum pyro- lysis and ab initiu molecular orbital calculations. A multi-step mechanism is pr