A. Lewanowicz et F. Baert, -(2-HYDROXY-5-METHYLPHENYL)-5-CHLOROBENZOTRIAZOLE, C13H10CLN3O, Acta crystallographica. Section C, Crystal structure communications, 50, 1994, pp. 801-803
Preliminary results of an X-ray crystal structure analysis show that t
he title molecule [2-(5-chloro-2-benzotriazolyl)-4-methylphenol] is pr
actically planar in the crystalline state. There is an intramolecular
hydrogen bond in which the hydroxyl group serves as a donor to the N3
atom of the benzotriazole moiety. Such systems, which undergo intramol
ecular proton transfer, are widely used as UV stabilizers.