Freezing of equilibrium of 1,2,4-triazole by complex formation with 1,1-di(2,4-dimethylphenyl)but-2-yn-1-ol, and X-ray crystal structure of the complex

Of the two tautomeric isomers of 1,2,4-triazole, 1,2,4-triazacyclopenta-3,5-diene and 1,2,4-triazacyclopenta-2,5-diene, the former was isolated as a 1:1 complex with the title host compound. X-Ray analysis of the complex reveals that the two molecular components are linked by hydrogen bonds with the triazole molecules lying in channels running parallel to the b axis, cutting a near O and c near 1/4.