The dynamics of ring rotation in ferrocene,nickelocene and ruthenocene by incoherent quadi-elastic neutron scattering |
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Authors: | AB Gardner S Howard TC Waddington RM Richardson J Tomkinson |
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Institution: | Chemistry Department, Science Laboratories, Durham University, South Road, Durham DH1 3LE, UK;Neutron division, Rutherford and Appleton Laboratories, Chilton, Didcot, Oxon OX11 0QX, UK |
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Abstract: | Incoherent quasi-elastic neutron scattering has been used to study the reorientational motions of the cyclopentadienyl rings in ferrocene, nickelocene and ruthenocene. The results for ferrocene show that the activation energy for ring rotation drops above the 164 K phase transition to 4.4 ± 0.5 kJ mol?1 (which is approximately half its low temperature value) but the rings still appear to jump between only five orientations on the observable time scale. At room temperature, the rings in nickelocene appear to behave the same as in ferrocene but in ruthenocene they reorientate much less frequently and resemble those in ferrocene below 164 K. |
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