I. The Infra-Red Spectrum of Tetramethyl Lead and the Force Constants of M(CH3)4 Type Molecules

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Abstract
The infra‐red absorption of tetramethyl lead has been measured in the region 2–23μ. A frequency assignment has been proposed. A partial normal coordinate analysis has been made using the fundamental frequencies of this investigation and the data of previous investigators of tetramethyl compounds. Thereby M — C valence‐type force constants of all the Group IV tetramethyl derivatives and the analogous tetramethyl ammonium ion have been determined. These force constants are compared with those predicted by the rules of Badger and Gordy and the relationship between bond force constants and atomic parameters is briefly considered.

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