| Abstract
| - The Hg12CH3, Hg13CH3, Hg12CD3, 199Hg12CH3, 201Hg12CH3, 201Hg13CH3, 199Hg12CD3, and 201Hg12CD3 radicalshave all been formed in a microwave discharge and isolated in an inert neon matrix. Their electronic structurewas established for the first time using electron spin resonance (ESR) spectroscopy. The following magneticparameters were determined from the experimental spectra, g⊥ = 1.84525(20), A⊥(199Hg) = 4337(3) MHz,A⊥(201Hg) = 1604(1) MHz, A⊥(13C) = 146(2) MHz, A⊥(H) = 31(1) MHz, and A⊥(D) = 5(1) MHz. Estimateswere made for the following magnetic parameters, g∥ = 1.990(5), A∥(199Hg) = 5658(10) MHz, A∥(201Hg) =2094(10) MHz, and A∥(13C) = 270(25) MHz. The free atom comparison method (FACM) was used to determinethe unpaired electron spin density distribution for the radical and to develop a bonding model. The HgCH3radical results are compared with our previous results for the ZnCH3 and CdCH3 radicals as well as othermercury-containing radicals such as HgH, HgCN, and HgF.
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