Infrared study of alkyl ketones adsorbed on the interlamellar surface of montmorillonite

The adsorptions of acetone, methyl ethyl ketone, diethyl ketone, and methyl methacrylate (NIMA) on montmorillonite (Mont) containing various interlaye r cations have been studied by means of infrared spectroscopy and X-ray met hods. Several characteristic carbonyl bands adsorbed on montmorillonite app eared differently at the region of 1723-1554 cm(-1) depending on the specie s of cation and the evacuation temperature. The carbonyl stretching bands s hifted about 190 cm(-1) to lower frequencies have been observed only for th e interaction between polyvalent cations and methyl methacrylate, which has been attributed to >C=O ... Mn+ complex formation. However, metal-MMA comp lexes without Mont using homogeneous solution were not obtained. The bands that appeared at 1703-1640 cm(-1) are responsible for the hydrogen bonding between carbonyl oxygen and cationic water or cationic hydroxyl group, and the degree of shift indicates good correlation with the polarizing power of the interlayer cations except for the Al3+ ion. However, the bands that ap peared at 1723-1710 cm(-1) have not been correlated with the species of cat ion so that they were assigned to the carbonyl stretching due to the intera ction with surface hydroxyl. On the basis of interlamellar spacing, it is s uggested that the molecular plane of MMA molecule is parallel to silicate l ayers.