The Absorption Spectra and Dissociation Energies of Cyanic Acid and Some Isocyanates

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Abstract
The absorption spectra of gaseous isocyanic acid, methyl, ethyl and phenyl isocyanates have been observed in the ultraviolet. The long wavelength limits of the continuous absorption found were as follows: HNCO, λ2240; CH3NCO, λ2550; C2H5NCO, λ2480; C6H5NCO, λ2420A. In the case of isocyanic acid, diffuse bands were also found in the region λλ2570–2250A. Characteristic absorption bands due to an excitation in the benzene ring were found in phenyl isocyanate. The structures are probably represented by the formulae H–N=C=O, CH3–N=C=O, C2H5–N=C=O, C6H5–N=C=O. The products and energies of dissociation have been described. The absence of the characteristic absorption due to =C=0 has also been discussed.

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