In this study, the interaction two monosubstituted aryl tetrazolones, namely 1-(4-nitrophenyl)-1,4-dihydro-tetrazol-5-one 1a and 1-(4-trifluoromethylphenyl)-1,4-dihydro-tetrazol-5-one 1b, with anions of varying basicity e.g. hydrogen sulfate (HSO4-), bromide (Br-), nitrate (NO3-), thiocyanate (NCS-),...