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采用13C魔角旋转核磁共振技术(MASNMR),对HDTMA+柱撑蒙脱石层间域内由于堆垛密度差异所致的具不同排列方式的有机离子的构形进行了研究。结果表明,长链烷基在层间并不是完全刚性的(All trans)状态,同时由不同构形离子组成的有机相之间的比例也不是不变的,而是随着有机离子在层间域内堆垛密度的增大,柱撑离子存在着一个从类似固体状态(Solid like)到类似液体状态(Liquid like)再到类似固体状态变化的宽范围的分子环境。其中平卧双层排列模式中有机分子所表现出的类似液体的性质最为明显,只有在较高堆垛密度的倾斜双层排列模式下层间离子才表现出较明显的类似固体状态。
The configurations of organic ions with different arrangement due to the difference of stacking density in the interlayer region of HDTMA + pillared montmorillonite were studied by using 13C magic angle rotating nuclear magnetic resonance (MASNMR) technique. The results show that the long-chain alkyl groups are not completely translocated between layers, and the proportion of organic phases composed of different conformational ions is not constant. With the increase of the stacking density in the domains, there exists a wide range of molecular environment of pillared ions from a solid-like state to a liquid-like state to a similar state of the solid. Among them, the liquid-like properties exhibited by organic molecules in the supine two-layer arrangement are the most obvious. Only in the oblique double-layer arrangement mode with higher stacking density, interlayer ions show a more obvious solid-like state.