In chemistry, a pentazolate is a compound that contains a cyclo-N<sub>5</sub><sup>âÂÂ</sup> ion, the anion of pentazole. In 2017, researchers prepared the first salt (N<sub>5</sub>)<sub>6</sub>(H<sub>3</sub>O)<sub>3</sub>(NH<sub>4</sub>)<sub>4</sub>Cl containing pentazolate anion starting a substituted phenylpentazole, m-CPBA and iron(II) glycinate. A series of metal and nonmetal pentazolates were subsequently synthesized according to their work.