Formation of chromium-containing complexes on a silica surface activated at 600 degrees C

Adsorption and thermal decomposition of arene chromium tricarbonyl compound s on an Aerosil surface activated at 600 degrees C are studied by means of IR spectroscopy. Dependence of the mechanism of the processes on the struct ure of the arene Ligand of organochromium compounds is analyzed. It is reli ably established that at 20 degrees C, the compounds in question interact w ith silanol terminal groups of Aerosil via the aromatic ligand and heteroat oms of a substituent in the aromatic ligand of arene chromium tricarbonyl c ompounds. The IR spectra in the spectral range of vibrations of CO, NH, C-R , and Si-OH groups and their variation in the course of thermal decompositi on suggest that adsorbed molecules undergo structural rearrangement, as the temperature increases, and interact with the surface via their carbonyl li gands to form chromium-containing surface complexes with higher bond energi es.