Abstract
Normal coordinate analyses have been carried out for the ClCH 2HGCl and BrCH 2HgBr molecules by use of the FG-matrix method and a simple valence force field incorporating ten primary five interaction force constants. Some re-assignments and modifications of the published experimental vibrational assignments are proposed, and other tentative assignments are confirmed by these calculations. A decrease in value of the HgC stretching force constant on going from (CH 3) 2Hg to ClCH 2HgCl is observed. A comparison is made of the stretching force constants for the series of molecules (CH 3) 2Hg, ClCH 2HgCl and Cl 3CHgCl, and the effect of substitution of the Cl atom in a methyl group of (CH 3) 2Hg is discussed.
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