Thermogravimetric analysis reversibility

McCoy, B. Polymer thermogravimetric analysis Effects of chain-end and reversible random scission. Chemical Engineering Science 2001 56 1525. 

Thermogravimetric analysis (TGA) of the co-crystals was carried out over the temperature range 25 °C to 200 °C by employing a Mettler Toledo instrument. These curves showed mass loss due to the removal of the aromatic guest molecules. The apo-hosts thus obtained did not dissolve in benzene and other aromatic solvents. The apo-hosts were immersed in the respective aromatic liquid for several hours. The crystals were then taken out, and the TGA repeated. This procedure was repeated more than once to find out whether the inclusion of the guest molecule was reversible and also whether there was any change in the temperature of decomposition or the proportion of the aromatic compound in the co-crystal, with such cycling. 

An important property of an ionic liquid in terms of its applications in biomass processing is its thermal stability, which is usually measured by thermogravimetric analysis. Nucleophilicity of the anion has been found to have an effect on the thermal stability of many ionic liquids due the role of the anion in the degradation of the cation [76], Quaternary ammonium, imidazolium, phosphonium and pyrrolidinium cations degrade at lower temperatures in the presence of highly nucleophilic anions such as halides due to Hoffman elimination and reverse Menschutkin reactions [76-79],... 

Minli, X., Ziemba, M. T. and Maurin, M. Sublimation characterization and vapor pressure of an FnV nonnucleoisde reverse transcriptase inhibitor using thermogravimetric analysis. AAPS PharmSciTech. 4(23) l-9, 2003.www.pharscitech.org, 2003. 

The presence of the co-ordinated hydroxy-groups was confirmed from i.r. and thermogravimetric data. Oxidative addition of iodine to [Pt(acac)2], either in the solid state or in carbon tetrachloride solution, has yielded the black complex [Pt(acac)2l2]- U.v.-visible and mass spectral measurements show the reaction to be reversible in solution or in the gas phase, and a singlecrystal X-ray analysis (Table 8) indicates trans octahedral geometry for the product. 

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