The cis-trans Isomerization of Azobenzene in the Molten State: A useful test reaction for the kinetic evaluation of DSC measurements |
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Authors: | N Eckardt H J Flammersheim H K Cammenga |
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Institution: | (1) FSU Jena, Inst. Phys. Chem., Lessingstr. 10, D-07743 Jena, Germany;(2) TU Braunschweig, Inst. Phys. u. Theoret. Chem., Hans-Sommer-Str. 10, D-38106 Braunschweig, Germany |
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Abstract: | Contrary to the situation in the field of temperature, heat and heat flow rate calibration, so far no generally accepted and easily practicable chemical reaction exists with regard to a kinetic evaluation. A possible reaction would be the well-known first-order cis-trans isomerization of subcooled liquid azobenzene. Surprisingly, the evaluation of measurements performed with a power compensated calorimeter yields activation parameters, which are dependent on the heating rate. The desmearing of the curves does not produce any improvements. However, constant activation parameters are obtained, if a small self-heating of the sample during the exothermic reaction is taken into account.This revised version was published online in November 2005 with corrections to the Cover Date. |
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Keywords: | azobenzene DSC kinetics |
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