Adiabatic calorimetry of the metallomesogen purple cobalt stearate Co(O2CC17H35)2 |
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| Authors: | Gerald R. Van Hecke Corresponding author Tadahiro Nakamoto Todd G. Clements Michio Sorai |
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| Affiliation: | 1. Research Center for Molecular Thermodynamics, Graduate School of Science , Osaka University , Toyonaka, Osaka, 560-0043, Japan;2. Department of Chemistry , Harvey Mudd College , Claremont, CA 91711, USA;3. Research Center for Molecular Thermodynamics, Graduate School of Science , Osaka University , Toyonaka, Osaka, 560-0043, Japan;4. Department of Chemistry , Harvey Mudd College , Claremont, CA 91711, USA |
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| Abstract: | The heat capacity of the metallomesogen purple cobalt stearate Co(O2CC17H35)2 has been measured by adiabatic calorimetry at temperatures between 16 and 420?K. This compound exhibits two crystalline phases (low temperature Cr2 and high temperature Cr1 phases), mesophase (M phase), and isotropic liquid (I phase). A third crystalline phase Cr3, which is entirely metastable with respect to all the others, is suggested by DSC studies. The Cr2-to-Cr1, Cr1-to-M, and M-to-I phase transitions occurred at 362.1, 380.9, and 400.4?K, respectively. The enthalpy and entropy gains at these phase transitions were determined. The mesophase is either smectic A or nematic. |
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| Keywords: | azobenzene liquid crystal smectic: photoisomerisation |
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