Department of Oxide Nanocomposites, Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 Generala Naumova Street, Kyiv 03164, Ukraine.
J Mass Spectrom. 2010 Jul;45(7):750-61. doi: 10.1002/jms.1765.
The interactions between coumarins and the surface of fumed SiO(2), CeO(2)/SiO(2), TiO(2)/SiO(2) and Al(2)O(3)/SiO(2) were assessed by means of temperature-programmed desorption mass spectrometry. The different stages of the thermolysis of coumarin were identified and an analysis of the underlying reactions was performed. The kinetic parameters of the involved reactions were thus obtained. The decomposition of thiazolyl-substituted coumarins was found to proceed through a 'thiazole-thiazine' ring expansion in the adsorbed state. A linear correlation between the sigma constants (Sigma sigma) of the coumarin substituents and the activation energy of CO(2) formation was obtained.
采用程序升温脱附质谱法研究了香豆素与无定形二氧化硅、氧化铈/二氧化硅、二氧化钛/二氧化硅和氧化铝/二氧化硅表面之间的相互作用。鉴定了香豆素热解的不同阶段，并对其进行了反应分析。因此获得了所涉及反应的动力学参数。发现噻唑取代香豆素的分解是通过吸附态中环的“噻唑-噻嗪”扩张进行的。香豆素取代基的sigma 常数（Sigma sigma）与 CO2形成的活化能之间存在线性相关关系。
