Thiocarbohydrazide (Alfa-Aesar), acetic acid (Merck), salicylaldehyde (Merck) and all the anions in the form of their tetrabutylammonium salts (Aldrich) were stored in a vacuum desiccator containing selfindicating silica-gel and all the above chemicals were used as received. 4-Salicylideneamino-3-methyl-1,2,4-triazole-5-thione (R1), was synthesized
accordingly as described in Section 2.3. Analytical grade DMSO (Aldrich) and other solvents (Merck) were used without further purification. Silica Gel G (Merck) was used for the thin layer chromatography (TLC).