Abstract
Recent progress in deuterium (D or 2H) labeling studies of radicals in the solid state is reviewed. Emphasis is placed on quantum effects at low temperature. The high-resolution EPR (ESR) spectra of selectively D-labeled methyl radicals were radiolytically generated together with a hydrogen atom methyl radical pair in an Ar matrix at cryogenic temperatures. The methyl radical spectra are discussed in terms of nuclear spin-rotation couplings using a three-dimensional free quantum-rotor model. A hydrogen atom hydrogen molecule (H···H2) pair formation in Ar is discussed in terms of D-isotope effects on quantum mechanical tunneling reaction. The H2 molecule as a “quantum solid” for high-resolution EPR spectroscopy is presented. D-effects on zero-point vibrational energy (ZPVE) are presented in combination with Jahn-Teller (J-T) distortion of some chemically important radical cations of methane, tetramethylsilane, cyclohexane and related radical cations whose mother molecules have high symmetrical structures such as T d and D 3d .D-isotope effects on methyl group conformations are exemplified using selectively deuterated dimethylether and monofluoromethane radical cations; the experimental results were also interpreted in terms of ZPVE incorporated with the mass difference of the two hydrogen isotopes. Furthermore, a D-labeling study on bimolecular homolytic substitution (SH 2) reactions by methyl radical in solid methylsilane (CH3 SiH3) is presented.
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Shiotani, M., Komaguchi, K. (2013). Deuterium Labeling Studies and Quantum Effects of Radicals in Solids. In: Lund, A., Shiotani, M. (eds) EPR of Free Radicals in Solids I. Progress in Theoretical Chemistry and Physics, vol 24. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4893-4_4
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