作者:Maggie C. C. Ng、Jason B. Harper、Anton P. J. Stampfl、Gordon J. Kearley、Stéphane Rols、John A. Stride
DOI:10.1002/chem.201202105
日期:2012.10.8
The Group XIV tetratolyl series X(C6H4‐CH3)4 (X=C, Si, Ge, Sn, Pb) were studied by using inelastic neutron scattering to measure the low‐energy phonon spectra to directly access the methyl‐group torsional modes. The effect of increased molecular radius as a function of the size of the central atom was shown to have direct influence on the methyl dynamics, reinforced with the findings of molecular dynamics
XIV族四甲苯基系列X(C 6 H 4 -CH 3)4(X = C,Si,Ge,Sn,Pb)是通过使用非弹性中子散射来测量低能声子谱来直接访问甲基扭转模态而研究的。结果表明,分子半径随中心原子大小变化的影响,对甲基动力学具有直接影响,而基于固态结构,分子动力学和接触面计算的发现进一步增强了这种影响。发现最轻的类似物的扭转模式主要是分子内的:Si和Ge类似物具有高度的分子间甲基-甲基相互作用,而最重的类似物(Sn和Pb)在整个声子浴中表现出明显的分子间甲基相互作用。晶格模式。