Knowledge Bank

The OH stretching, in-plane OH deformation, and torsional fundamentals of t-HOCO, previously reported1 in a study of the vacuum-ultraviolet photolysis of $H2O$ in a CO matrix, experience large shifts upon removal of the hydrogen-bonding perturbation by isolation of t-HOCO in solid argon. Because of these large shifts, a Fermi resonance perturbation of the $C=O$ stretching fundamental is altered, resulting in a substantial matrix dependence for the isotopic shift in this fundamental of t-DOCO. t-HOCO affords an unusual opportunity to study the effect of hydrogen bonding at either end of the molecule. Infrared spectral data for $OC\dots H-O-C=O$, isolated t-HOCO, and $H-O-C=O\dots HF$ will be compared.