Characterizing the thermal degradation mechanism of two bisphosphoramidates by TGA, DSC, mass spectrometry and first-principle theoretical protocols
作者:José Luis Castrejón-Flores、Julieta Reyna-Luna、Yazmin M. Flores-Martinez、María Isabel García-Ventura、Angel Zamudio-Medina、Marco Franco-Pérez
DOI:10.1016/j.molstruc.2020.128781
日期:2020.12
decomposition through differential scan calorimetric (DSC) and thermogravimetric (TGA) experiments was evaluated. Then, their molecular degradation path was followed by analysing recorded data from mass spectrometry measurements performed at different temperature conditions. Their corresponding thermal degradation mechanism was then established by searching plausible transition states interconnecting
摘要 本研究描述了一种组合实验-理论策略来评估两种对称双氨基磷酸酯、四苯基乙烷-1,2-二基双(氨基磷酸酯)1 和四苯基丙烷-1,3-二基双(氨基磷酸酯)5 的耐热特性。因此,通过差示扫描量热法 (DSC) 和热重法 (TGA) 实验评估了它们对热分解的结构阻力。然后,通过分析在不同温度条件下进行的质谱测量记录的数据,跟踪它们的分子降解路径。然后,通过使用基于耦合簇计算的量子理论协议,搜索将我们质谱记录中发现的中间体相互连接的似是而非的过渡态,建立了它们相应的热降解机制。通过这种策略,确定了在其分子降解机制中研究的两种双磷酰胺的关键中间体,尽管化合物 5 显示出最高的耐热分解性。