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应用高转速的1H魔角旋转核磁共振技术,区分高岭石结构中的内羟基和内表面羟基,研究高岭石/甲酰胺插层机理.内羟基质子的化学位移δ=-1.3～-0.9,内表面羟基δ=2.4～3.0.高岭石/甲酰胺插层复合物的1H核磁共振谱出现3个质子峰,内表面羟基与甲酰胺羰基形成氢键后质子峰向高场方向位移至δ=2.3～2.7;由于氨基质子在高岭石复三方孔洞的嵌入,在氨基质子与内羟基质子之间产生范德华效应,使内羟基质子峰向低场方向位移至δ=-0.3.插层作用产生的附加质子峰为δ=5.4～5.6,归属于与高岭石四面体氧原子形成氢键的氨基质子.
The high-speed 1H Magic Angle Rotation Nuclear Magnetic Resonance (NMR) technique was used to distinguish the hydroxyl groups on the inner and outer surfaces of the kaolinite structure and to study the mechanism of kaolinite / formamide intercalation. The chemical shift δ = -1.3 ~ -0.9 , The inner surface hydroxyl δ = 2.4 ~ 3.0. The 1H nuclear magnetic resonance spectrum of the kaolinite / formamide intercalation complex showed three proton peaks. The proton peak shifted to the high field direction after hydrogen bond between the inner surface hydroxyl group and formamide carbonyl δ = 2.3 ~ 2.7. Due to the intercalation of amino protons into the tripartite pores of kaolinite, a van der Waals effect was produced between the proton of the proton and the proton of the proton and the proton peak of the proton shifted to δ = -0.3. The additional proton peak generated by the action is δ = 5.4-5.6, attributable to the amino protons that form hydrogen bonds with the oxygen atoms of the kaolinite tetrahedra.