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高压诱致的反式联苯乙烯酮结构相变与化学反应

DOI: 10.11858/gywlxb.2009.06.001, PP. 401-406

Keywords: 反式联苯乙烯酮,高压,拉曼,能量色散X射线衍射,相变

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Abstract:

利用金刚石对顶砧(DAC)高压装置在室温下对反式联苯乙烯酮(Trans,Trans-Dibenzylideneacetone)分子晶体进行了高压拉曼谱、荧光光谱和能量色散X射线衍射(EDXRD)研究。结果表明,在压力为1.0~1.3GPa时,反式联苯乙烯酮发生了晶体—晶体的结构相变,同时开始伴随有压力诱导的化学反应,反应完成的压力为6.5GPa。高压X射线研究表明,这次相变有新的共价键产生,可能的化学变化过程是,C=C双键打开再与相邻的分子结合生成新的共价键。在压力大约为11GPa时,反式联苯乙烯酮分子晶体再次发生了晶体的结构相变。新产生的物质在卸压后依然保持稳定。

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