Stability of Hydrogen-Bonded Supramolecular Architecture under High Pressure Conditions: Pressure-Induced Amorphization in Melamine−Boric Acid Adduct

• DOI: 10.1021/la804034y
• Publication Date: 2009-02-25T17:49:34Z
• Authors: Kai Wang; Defang Duan; Run Wang; Aolei Lin; Qiliang Cui; Bingbing Liu; Tian Cui; Bo Zou; Xi Zhang; Jingzhu Hu; Guangtian Zou; Ho-kwang Mao
• Keywords: 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

The effects of high pressure on the structural stability melamine−boric acid adduct (C3N6H6·2H3BO3, M·2B), a three-dimensional hydrogen-bonded supramolecular architecture, were studied by in situ synchrotron X-ray diffraction (XRD) and Raman spectroscopy. M·2B exhibited compressibility strong anisotropic compression, which can be explained layerlike crystal packing. Furthermore, evolution XRD patterns spectra indicated that undergoes reversible pressure-induced amorphization (PIA) at 18 GPa. mechanism for PIA was attributed to competition between close packing long-range order. Ab initio calculations also performed account behavior hydrogen bonding under pressure.