NIR and UV induced transformations of indazole-3-carboxylic acid isolated in low temperature matrices.

The molecular structure and NIR and UV induced phototransformations of indazole-3-carboxylic acid were studied in low temperature argon and nitrogen matrices by FTIR spectroscopy and B3LYP/6-311++G(2d,2p) calculations. Eleven minima of IC were located on the S potential energy surface. The three most stable structures were detected experimentally in both matrices after deposition.