Stabilization of the Pentazolate Anion in a Zeolitic Architecture with Na20N60 and Na24N60 Nanocages

• Published in: Angewandte Chemie International Edition 2018-03, Vol.57 (10), p.2592-2595
• Main Authors: Zhang, Wenquan, Wang, Kangcai, Li, Juecheng, Lin, Zhien, Song, Siwei, Huang, Shiliang, Liu, Yu, Nie, Fude, Zhang, Qinghua
• Format: Article
• Language: English
• Subjects: Anions; Bonding strength; Chemical bonds; Metals; nanocages; pentazole; Salts; Sodium; stabilization; Synthesis; Thermal stability; zeolitic frameworks
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.201710602

The experimental detection and synthesis of pentazole (HN5) and its anion (cyclo‐N5−) have been actively pursued for the past hundred years. The synthesis of an aesthetic three‐dimensional metal–pentazolate framework (denoted as MPF‐1) is presented. It consists of sodium ions and cyclo‐N5− anions in which the isolated cyclo‐N5− anions are preternaturally stabilized in this inorganic open framework featuring two types of nanocages (Na20N60 and Na24N60) through strong metal coordination bonds. The compound MPF‐1 is indefinitely stable at room temperature and exhibits high thermal stability relative to the reported cyclo‐N5− salts. This finding offers a new approach to create metal–pentazolate frameworks (MPFs) and enables the future exploration of interesting pentazole chemistry and also related functional materials. Aesthetic pentazole: A 3D open framework featuring two types of nanocages (Na20N60 and Na24N60) was successfully synthesized. In the structure, the isolated cyclopentazolate anions and sodium ions construct a zeolitic architecture through strong metal coordination bonds.