Low-Temperature Infrared Study of Intermediates in the Photolysis of HNCO and DNCO

Abstract
HNCO and DNCO suspended in Ar and in N2 matrices at 4° and at 20°K are shown to yield upon photolysis the corresponding tautomers, HOCN and DOCN, for which vibrational assignments are proposed. HOCN may be produced by recombination at the O atom of H+NCO produced in a primary photolytic rupture of the N–H bond, as well as by the attack of NH (3Σ—) on the carbon—oxygen bond of CO, giving an unstable cyclic intermediate.
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