New Assembly of Acetamidinium Nitrate Modulated by High Pressure

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• 作者：Shourui Li ; Qian Li ; Rui Li ; Jing Liu ; Ke Yang ; Bingbing Liu ; Bo Zou
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 16, 2014
• 年：2014
• 卷：118
• 期：41
• 页码：23443-23450
• 全文大小：524K
• ISSN：1932-7455

文摘

High pressure is an essential thermodynamic parameter in exploring the performance of condensed energetic materials. Combination of high-pressure techniques and supramolecular chemistry opens a new avenue for synthesis of high energy density materials. Herein, we fabricate a new high-pressure-assisted assembly of energetic material acetamidinium nitrate (C₂N₂H₇⁺路NO₃^{鈥?/sup>, AN) with P-1 symmetry after a 0鈥?2 GPa鈥? treatment at room temperature, which exhibits a density that is 9.8% higher than that of the initial P2₁/m phase. Evolution of intermolecular lattice modes in Raman spectra and synchrotron X-ray diffraction (XRD) patterns provide strong evidence for this transition in the 1.3鈥?.4 GPa range. The mechanism involves relative motions between ionic pairs in the hydrogen-bonded array and distortions of building blocks.}