Neutron scattering study of the reorientational motions in Cr(CO)3(η6C6H6) and Mn(CO)3(η5C5H5) |
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Authors: | G Lucazeau K Chhor C Sourisseau AJ Dianoux |
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Institution: | Laboratoire Chimie-Physique du Solide, C.S.P., Université Paris-Nord, Avenue J.B. Clément, 93430 Villetaneuse, France;L.A.S.I.R., C.N.R.S., 94320 Thiais, France;Institut Laue—Langevin, 156X, 38042 Grenoble Cedex, France |
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Abstract: | Incoherent quasi-eleastic neutron scattering experiments: using different resolutions and a wide Q range, have been performed on polycrystalline samples of Cr(CO)3(η6C6H6) and Mn(CO)3(η5C5H5) in the 280–320 K temperature range. It is shown that aromatic rings are involved into a reorientational process characterized by an activation energy of ≈ 16 kJ mol?1 and by correlation times of the order of 2 × 10?11 s and 5 × 10?11 s at 300 K for C6H6 and C5H5 rings respectively. Experimental elastic incoherent structure factors are in agreement with the 2π/6 and 2π/5 jump models and the fitted spectra confirm these models. From a comparison with heat-capacity results we conclude that M(CO)3 groups are fixed during the reorientational process. Finally a comparison with literature data is presented. |
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