The guest ordering and dynamics in urea inclusion compounds studied by solid-state 1H and 13C MAS NMR spectroscopy
作者:Xiaorong Yang、Klaus Müller
DOI:10.1016/j.molstruc.2011.08.056
日期:2011.12
inclusion compounds with n-alkane or decanoic acid show that the 13C T1 and 13C T1ρ values exhibit the position dependence towards the center of the chain, indicating internal chain mobility. The analysis of variable-temperature 13C T1ρ experiments on urea inclusion compounds with hexadecane and pentadecane, for the first time, suggests that chain fluctuations and lateral motion of n-alkane guests may contribute
通过 13C CP MAS 和 1H MAS NMR 光谱研究了具有不同客体种类的尿素包合物。可以以三种不同的方式排列不对称的客体物种:头-头、头-尾和尾-尾。13C CP MAS NMR 研究表明优先排列由末端官能团的相互作用强度决定。13C弛豫实验用于研究尿素包合物的动态特性。对含有正烷烃或癸酸的尿素包合物的 13C 弛豫研究表明,13C T1 和 13C T1ρ 值表现出朝向链中心的位置依赖性,表明内部链的流动性。尿素包合物与十六烷和十五烷的变温13C T1ρ实验分析,首次,