Thermolysis of 5-Phenyltetrazole

Photolysis of 5-Phenyltetrazole 2

IR difference spectrum after 1 min photolysis (254 nm) of 5-phenyltetrazole 2 in Ar matrix at 12 K. Positive peaks: photolysis products, largely benzonitrile imine 6; the peak near 1700 cm−1 is due to an impurity on the deposition window. Negative peaks: reacted tetrazole 2.

(Left) Partial IR difference spectra of 5-phenyltetrazole 2 at 12 K in Ar matrix at different photolysis times, showing peaks due to the photolysis products. Peaks at 2129 and 2166 cm−1 are due to PhN=C=NH 5. The peak at 2073 cm−1 is assigned to PhCNNH 6. Ordinate in absorbance units. (Right) Plots of IR absorbances at different wavelengths versus photolysis time. Ordinate in relative absorbance units.