Raman and infrared spectra of aluminium isopropoxide in some liquid and solid forms occurring at room temperature have been investigated. The depolarization ratio of Raman lines has been measured for the liquid. The vibrational spectra are consistent with the occurrence of two molecular forms. In the freshly heated liquid and in the solid melting at 29.5°, probably a trimer is present. The vibrational spectra of this form and of dimeric Al‐t‐butoxide differ distinctly in the range 0‐750 cm−1. In the aged liquid and in the solids melting at 118° or about 137° a partially six‐coordinated tetramer, as proposed by Bradley, is the more probable molecular species.
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Fieggen et al. (1971) studied this question.