AN ORIENTATION OF 4-DIMETHYLAMINOPYRIDINE IN KAOLINITE INTERLAYERS

Abstract

A kaolinite-dimethylaminopyridine (DMAP) intercalation compound (Kaol-DMAP) was prepared for the first time by intercalation reaction of DMAP using an intermediate of methoxyl-modified kaolinite. The obtained intercalation compound displayed a 0.70-nm galley height based on its X-ray diffraction pattern and a band at 3637 cm⁻¹ in the Fourier-transform infrared spectrum demonstrating the presence of hydrogen-bonded hydroxyls. Additionally, solid-state ¹³C nuclear magnetic resonance with cross polarization and magic angle spinning techniques revealed that the methyl groups in DMAP were present in a single environment. A comparison of these results with those for kaolinite intercalation compounds with pyridine and its derivatives reported previously demonstrates that the orientation of intercalated DMAP was mostly perpendicular to the kaolinite layers.