Infrared Spectra of CH<sub>3</sub>–MX and CH<sub>2</sub>X–MH Prepared in Reactions of Laser-Ablated Gold, Platinum,
Palladium, and Nickel Atoms with CH<sub>3</sub>Cl and CH<sub>3</sub>Br
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Abstract
Au,
Pt, Pd, and Ni insertion complexes have been produced in reactions
with methyl chloride and bromide. The primary products are identified
in the matrix IR spectra on the basis of deuterium shifts in the vibrational
frequencies and correlation with DFT calculated frequencies. However,
fragments of the insertion complexes and the higher oxidation state
derivatives, which have been observed in previous studies for reactions
with methane and fluoromethane, were not detected. The Pt C–H
insertion complex (CH<sub>2</sub>Cl–PtH) is also produced,
parallel to the fluorinated analogue. The observed Pt and Pd products
have highly bent CMX(H) moieties, which are traced to the unusually
high d orbital contributions from the metal atom to the C–M
and M–X(H) bonds