A convenient and selective TLC of 4-R-1,2,4-triazoles (Rtrz) and nitrogen containing aromatic rings is presented (molecules 1-11). This simple revelation method implies a complexation of heterocycles to Co(II) ions on a TLC plate, followed by a subsequent modification of the reduction potential which enables oxidation of Co(II) by permanganate.
Boland, Y., Attout, A., Marchand-Brynaert, J., & Garcia, Y. (2007). Selective thin-layer chromatography of 4-R-1,2,4-triazoles. Journal of Chromatography A, 1141(1), 145-149. https://doi.org/10.1016/j.chroma.2006.12.012 (Original work published 2007)