Tetrazole-5-carboxylic Acid Based Salts of Earth Alkali and Transition Metal Cations

The tetrazole-5-carboxylate anion was investigated as ligand for earth alkali metal and transition metal complexes. Therefore, the strontium 4a (*3H2O, *2.75H2O, *2.5H2O), barium 4b (*3H2O), copper 4c (*3.5H2O, *4H2O), manganese 4d (*4H2O, *5H2O), and silver tetrazol-5-carboxylate 4e (*1.56H2O) were synthesized and characterized by vibrational spectroscopy (IR), and the crystal structures of 4a (*2.75H2O, *2.5H2O), 4b*3H2O, 4c*4H2O, and 4d*5H2O were determined using single crystal X-ray diffraction. The thermal stability was investigated by DSC-measurements, and the sensitivity toward impact and friction was determined by BAM-standards. The copper, strontium, and barium tetrazole-5-carboxyate proved to be suitable thermal and physical stable colorants for pyrotechnic compositions. The crystal structure of the tetragonal modification of strontium tetrazole-5-carboxyate possesses channels along the c-axis, leading to a porous material.