Parker S F, Herman H
ISIS Facility, Rutherford Appleton Laboratory, Didcot, Oxon, UK.
Spectrochim Acta A Mol Biomol Spectrosc. 2000 May;56(6):1123-9. doi: 10.1016/s1386-1425(99)00210-3.
The inelastic neutron scattering and high-resolution FT-Raman spectra of methyltrioxorhenium are reported. Literature assignments of the modes below 1600 cm(-1) are largely confirmed with the exceptions of the methyl torsion and the ReO3 bending modes. The methyl torsion is observed for the first time at 200 cm(-1), while the band at 230 cm(-1) assigned previously to the torsion is shown to be a component of the factor group splitting of the solid. In the FT-Raman spectrum, the bands that derive from the E modes in the isolated molecule are split by the Cs site symmetry of the crystal. This allows an unambiguous assignment of these modes to be made. On this basis, the assignment of the ReO3 bending modes is reversed with the asymmetric mode at 325 cm(-1) and the symmetric mode at 276 cm(-1).
报道了甲基三氧化铼的非弹性中子散射和高分辨率傅里叶变换拉曼光谱。1600 cm(-1)以下振动模式的文献归属在很大程度上得到了证实，但甲基扭转振动模式和ReO3弯曲振动模式除外。首次在200 cm(-1)处观测到甲基扭转振动，而之前归属于扭转振动的230 cm(-1)处的谱带被证明是固体因子群分裂的一个组分。在傅里叶变换拉曼光谱中，孤立分子中源于E模式的谱带被晶体的Cs位点对称性分裂。这使得这些模式能够得到明确的归属。在此基础上，ReO3弯曲振动模式的归属发生了反转，不对称模式位于325 cm(-1)，对称模式位于276 cm(-1)。
