1H-Tetrazole-5-acetic acid(H2tza) may be used in the preparation of:5-(trinitromethyl)-2H-tetrazoleN-(furan-2yl methyl)-2-(1H-tetrazol-5-yl)acetamidetetrazolium based ionic liquidIt may also be used as a bifunctional ligand for the synthesis of novel copper(II) and nickel(II) complexes.