The solid state disorder of two tetrahydronaphthalene derivatives, N-methyl-N-methoxy-5,6,7,8-tetrahydro-1-naphthamide and 5,6,7,8-tetrahydro-1-naphthoic acid, was studied by solid state NMR and single crystal X-ray diffraction. The X-ray crystal structure of N-methyl-N-methoxy-5,6,7,8-tetrahydro-1-naphthamide was obtained at 123 K. It indicated the presence of two distinct molecular conformations. Solid state 13C CP/MAS NMR data using the dipolar dephasing technique revealed that the two conformations of the molecule are dynamically disordered, while solid state 2H NMR data, collected on a specifically deuterated analog, were used to determine the populations of each conformation as well as an apparent activation energy. Solid state NMR experiments were also used to show that 5,6,7,8-tetrahydro-1-naphthoic acid possesses the same type of dynamic disorder. Key words: deuterium NMR, solid state NMR, dynamic disorder. X-ray, tetrahydronaphthalene derivatives
两个四氢
萘衍
生物,N-甲基-N-甲氧基-5,6,7,8-四氢-1-
萘酰胺和
5,6,7,8-四氢-1-萘甲酸的固态无序性通过固态NMR和单晶X射线衍射进行了研究。N-甲基-N-甲氧基-5,6,7,8-四氢-1-
萘酰胺的X射线晶体结构在123K时获得。它表明存在两种不同的分子构象。使用偶极耦合去相位技术的固态
13C CP/MAS NMR数据显示分子的两种构象是动态无序的,而在特定
氘代物上收集的固态
2H NMR数据用于确定每种构象的种群以及表观活化能。固态NMR实验还表明
5,6,7,8-四氢-1-萘甲酸具有相同类型的动态无序性。关键词:
氘NMR,固态NMR,动态无序。X射线,四氢
萘衍
生物