Stabilization of pentazolate anions in the high-pressure compounds Na2N5 and NaN5 and in the sodium pentazolate framework NaN5·N2. Issue 21 (29th April 2021)

• Record Type: Journal Article
• Authors: Bykov, Maxim; Bykova, Elena; Chariton, Stella; Prakapenka, Vitali B.; Batyrev, Iskander G.; Mahmood, Mohammad F.; Goncharov, Alexander F.
• Is Part Of: Dalton transactions. Volume 50:Issue 21(2021)
• Page Start: 7229
• Page End: 7237
• Publication Date: 2021-04-29
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d1dt00722j
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Three oxygen-free pentazolate salts Na2 N5, NaN5 and NaN5 ·N2 were synthesized from sodium azide NaN3 and molecular nitrogen N2 at 50 GPa. Abstract : Synthesis and characterization of nitrogen-rich materials is important for the design of novel high energy density materials due to extremely energetic low-order nitrogen–nitrogen bonds. The balance between the energy output and stability may be achieved if polynitrogen units are stabilized by resonance as in cyclo -N5 − pentazolate salts. Here we demonstrate the synthesis of three oxygen-free pentazolate salts Na2 N5, NaN5 and NaN5 ·N2 from sodium azide NaN3 and molecular nitrogen N2 at ∼50 GPa. NaN5 ·N2 is a metal-pentazolate framework (MPF) obtained via a self-templated synthesis method with nitrogen molecules being incorporated into the nanochannels of the MPF. Such self-assembled MPFs may be common in a variety of ionic pentazolate compounds. The formation of Na2 N5 demonstrates that the cyclo -N5 group can accommodate more than one electron and indicates the great accessible compositional diversity of pentazolate salts.