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The infrared spectra of GeH30COCH3 and (CH3)3GeOCOCH3 have been measured in the gas phase over the range 650-3800 cm-l. Assignments for the pri~lcipal bands have been made and their values compared with those of anaIogous alkyl, methylsilyl, methyltin, and methyllead acetates. Carbonyl absorption bands shift to lower frequencies and carbon-oxygen (skeletal) absorptions to higher frequencies as M changes from C to Si to Ge in the series of acetates represented by (CH3)3MOCOCH3. These results suggest that the Ge-0 bond is more polar than the Si-0 bond and that the order of electron release in acetate derivatives is (CH3)3Ge > (CH3)3Si > (CH3)3C, which is consistent with the electronegativity order: C > Si > Ge.
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