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|Section2= }} The pentazenium cation (also known as pentanitrogen) is a positively charged polynitrogen ion of the chemical formula . Together with dinitrogen and the azide anion, it is one of the only three polynitrogen species obtained in bulk quantities. ==History== Within the High Energy Density Matter research program, run by the U.S. Air Force since 1986, systematic attempts to approach polynitrogen compounds began in 1998, when Air Force Research Laboratory at Edwards AFB became interested in researching alternatives to the highly toxic hydrazine-based rocket fuel and simultaneously funded several such proposals. Karl O. Christe, then, a senior investigator at AFRL, chose to attempt building linear out of and , based on the proposed bond structure: : ()+ + HN=N=N → ()+ + HF The reaction succeeded, and was created in sufficient quantities to be fully characterized by NMR, IR and Raman spectroscopy in 1999. The salt was highly explosive, but when was replaced by , a stronger Lewis acid, much more stable was produced, shock-resistant and thermally stable up to 60–70 °C. This made bulk quantities, easy handling, and X-ray crystal structure analysis possible. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「pentazenium」の詳細全文を読む スポンサード リンク
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