INFRARED SPECTRA OF TRANSITION METAL ALKOXIDES.
Rept. for Feb 63-Feb 64,
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
Pagination or Media Count:
The infrared spectra of a number of transition metal isopropoxides and tetra tertiary butoxides were obtained from 5000 cm-1 to 285 cm-1 for the first time. The spectra were compared to existing infrared data on these classes of compounds. Characteristic absorptions for the isopropoxy group have been found at 1160 to 1175 cm-1 and at 1120 to 1140 cm-1. They are assigned to isobranching vibrations. The isopropoxides exhibit a doublet at about 1375 cm-1 and 1365 cm-1 characteristic of the gem-dimethyl structure. The major feature of the spectra is a very strong band in 1000 cm-1 region assigned as the C-O stretch vibration, which is shifted by the influence of the specific metal atom on the C-O vibration. The butoxides have four characteristic absorptions at about 785 cm-1, 900 cm-1, 1010 cm-1, and 1190 cm-1. The band in the 1000 cm-1 region appears to be the C stretch vibration, the other bands are attributed to skeletal vibrations of the tert-butyl group. The typical C-H deformation of the tert-butyl group is observed at about 1360 cm-1 with a weaker band at 1380 cm-1. In the medium infrared region to 285 cm-1 a small number of very strong absorption bands are found for the tert-butoxides. The results suggest the region would be very satisfactory for characterizing tert-butyl compounds. Author