Studies of molecular motions in the three phases of 1,1′,2,2′-tetrachloroferrocene by Mössbauer and1H-NMR spectroscopy |
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Authors: | F Y Uchimi Y Masuda K Iwai M Katada H Sano |
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Institution: | (1) Department of Chemistry, Faculty of Science, Tokyo Metropolitan University Fukasawa, Setagaya-ku, 158 Tokyo, Japan |
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Abstract: | The molecular motions in the three phases of 1,1′,2,2′-tetrachloroferrocene below m.p. were studied by using57Fe-Mossbauer and1H FT-NMR spectroscopy. In the plastic phase at the low temperature, a rotational mode around the pseudo C5 molecular axis was found to be activated with activation energy of 15 kJ/mol and in the higher temperature phase the rotational
mode of the pseudo C5 axis itself was found to be activated with activation energy of 23 kJ/mol in addition to the rotational mode around the pseudo
C5 axis. On the57Fe-Mossbauer spectra, a steep decrease of the areal intensity was observed above the first transition temperature. The areal
intensity in the lower plastic phase was estimated to be less than a few percent relative to that at 298 K. The results were
discussed in terms of different possibilities for the movement of the molecules. |
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