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A TPD‐MS study of the interaction of coumarins and their heterocyclic derivatives with a surface of fumed silica and nanosized oxides CeO 2 /SiO 2 , TiO 2 /SiO 2 , Al 2 O 3 /SiO 2
Author(s) -
Kulyk Kostiantyn,
Ishchenko Valentyna,
Palyanytsya Borys,
Khylya Volodymyr,
Borysenko Mykola,
Kulyk Tetiana
Publication year - 2010
Publication title -
journal of mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 1076-5174
DOI - 10.1002/jms.1765
Subject(s) - chemistry , fumed silica , coumarin , desorption , decomposition , thermal decomposition , adsorption , activation energy , mass spectrometry , thiazole , organic chemistry , chromatography
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‐programed 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 (Σσ) of the coumarin substituents and the activation energy of CO 2 formation was obtained. Copyright © 2010 John Wiley & Sons, Ltd.