Photolysis of matrix-isolated acetyl bromide and the infrared spectrum of the 1:1 molecular complex of hydrogen bromide with ketene in solid argon

Article abstract of DOI:10.1016/0022-2860(93)80286-5

Ketene and HBr were generated by photolysis of acetyl bromide in argon matrix.Of the photolysis products, ketene and HBr were trapped in the same matrix cage to form 1:1 molecular complex.The HBr stretching mode in the complex was observed at 2396 cm^-1, which was displaced to 160 cm^-1 below the frequency of the monomer HBr fundamental in solid argon.The DBr stretching frequency in the ketene-d2-DBr complex produced on photolysis of acetyl bromide-d3 was observed at 1717 cm^-1, which was displaced to 120 cm^-1 below the frequency of the monomer DBr fundamental in solid argon.After the matrices were annealed, these absorptions were shifted to 2383 and 1708 cm^-1, respectively.