设计了一种基于核磁共振氟核测定4-三氟甲基吡啶和全氟丁基磺酸钾的扩散排序谱(19 F DOSY NMR)实验。在实验中分别观察到两组扩散序数,在高场的4个峰处于同一水平位置,即具有相同的扩散系数,则证明这4个峰属于同一化合物;低场的一个峰...设计了一种基于核磁共振氟核测定4-三氟甲基吡啶和全氟丁基磺酸钾的扩散排序谱(19 F DOSY NMR)实验。在实验中分别观察到两组扩散序数,在高场的4个峰处于同一水平位置,即具有相同的扩散系数,则证明这4个峰属于同一化合物;低场的一个峰则属于另一化合物,确证了样品中存在两种成分。结果表明,19 F DOSY NMR技术可用于含氟化合物高效、快速的常规分析,亦可测定含氟分子在溶液中的扩散系数,根据扩散系数变化表征分子间是否存在相互作用。展开更多
Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occu...Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occupancy in clathrate hydrate cages,which is an important area of the microscopic structures.The characterizing method and features of different guest molecular,such as hydrocarbon,carbon dioxide,hydrogen and inhibitor/promoter,in different hydrate cages have been extensively reviewed.A comprehensive use of advanced technologies such as X-ray diffraction,Raman spectroscopy and nuclear magnetic resonance may provide better understanding on the compositions and microscopic mechanisms of clathrate hydrate.展开更多
文摘设计了一种基于核磁共振氟核测定4-三氟甲基吡啶和全氟丁基磺酸钾的扩散排序谱(19 F DOSY NMR)实验。在实验中分别观察到两组扩散序数,在高场的4个峰处于同一水平位置,即具有相同的扩散系数,则证明这4个峰属于同一化合物;低场的一个峰则属于另一化合物,确证了样品中存在两种成分。结果表明,19 F DOSY NMR技术可用于含氟化合物高效、快速的常规分析,亦可测定含氟分子在溶液中的扩散系数,根据扩散系数变化表征分子间是否存在相互作用。
基金Supported by the National Natural Science Foundation of China(51706248,51876222)National Key R&D Program of China(2017YFC0307304)
文摘Study on the microscopic structure of clathrate hydrate has made significant progress in the past decades.This review aims to summarize the state of the art of the experimental characterization of guest molecular occupancy in clathrate hydrate cages,which is an important area of the microscopic structures.The characterizing method and features of different guest molecular,such as hydrocarbon,carbon dioxide,hydrogen and inhibitor/promoter,in different hydrate cages have been extensively reviewed.A comprehensive use of advanced technologies such as X-ray diffraction,Raman spectroscopy and nuclear magnetic resonance may provide better understanding on the compositions and microscopic mechanisms of clathrate hydrate.
