Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 847, Issue -, Pages 173-183Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2017.05.044
Keywords
POSS; Silsesquioxane; Sandmeyer; Thermal degradation; Kissinger method; Activation energy
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Funding
- National Science Centre, Poland [UMO-2015/19/B/ST5/02917, UMO-2016/21/N/ST5/03293]
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Four new homosubstituted amido-functionalized polyoctahedral oligomeric silsesquioxanes 6-X (X - F, Cl, Br, I) have been synthesized using Sandmeyer approach with 37-52% yields from a new diazo POSS precursor 5-OTs. Compounds were characterized by spectroscopic methods including 29Si NMR spectroscopy, X-ray crystallography (for 6-Br), and mass spectrometry. They were extensively studied by TG and DTA techniques in flowing nitrogen and synthetic air atmospheres. Experiments were performed in the 30-1000 degrees C range and showed different behavior depending on the atmosphere. The residual masses obtained at different temperatures were analyzed using IR to get insight into the thermal degradation mechanism. Additionally, activation energies of the decomposition process using Kissinger method were calculated for 6-X and its non-halogenated analog 2. (C) 2017 Elsevier B. V. All rights reserved.
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