Infrared Studies of Dimethylsilylamine and Methyldisilylamine by the Matrix‐Isolation Technique

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Abstract
A partial assignment of the fundamental vibrational modes of (CH3)2SiH3N and CH3(SiH3)2N is proposed based on the infrared spectra of the matrix‐isolated molecules. Calculated and observed vibration—rotation band envelopes are compared and are found to be indicative of a pyramidal skeleton for the monosilyl molecule and a planar skeleton for the disilyl molecule. Compelling evidence for the intermolecular association through p→d bonding in (CH3)2SiH3N is presented in the form of radical changes in the infrared absorption spectrum as the concentration of this molecule in an argon matrix is increased. Although the structure of the associated molecules can not be deduced from the complicated spectrum of the solid, several conceivable geometries are discussed.