High-Pressure Synthesis of a Pentazolate Salt

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• 作者：Brad A. Steele ; Elissaios Stavrou ; Jonathan C. Crowhurst ; Joseph M. Zaug ; Vitali B. Prakapenka ; Ivan I. Oleynik
• 刊名：Chemistry of Materials
• 出版年：2017
• 出版时间：January 24, 2017
• 年：2017
• 卷：29
• 期：2
• 页码：735-741
• 全文大小：439K
• ISSN：1520-5002

文摘

The pentazolates, the last all-nitrogen members of the azole series, have been notoriously elusive for the last hundred years despite enormous efforts to make these compounds in either gas or condensed phases. Here, we report a successful synthesis of a solid state compound consisting of isolated pentazolate anions N₅^–, which is achieved by compressing and laser heating cesium azide (CsN₃) mixed with N₂ cryogenic liquid in a diamond anvil cell. The experiment was guided by theory, which predicted the transformation of the mixture at high pressures to a new compound, cesium pentazolate salt (CsN₅). Electron transfer from Cs atoms to N₅ rings enables both aromaticity in the pentazolates as well as ionic bonding in the CsN₅ crystal. This work provides critical insight into the role of extreme conditions in exploring unusual bonding routes that ultimately lead to the formation of novel high nitrogen content species.