Abstract

The infrared and Raman spectra of solutions and solid samples of (π-maleic anhydride)iron tetracarbonyl have been studied. An assignment of the modes is suggested and the ligand vibrations in the complex are compared the data for maleic and succinic anhydrides. The CC stretching frequency maleic anhydride shifts from 1595 to 1352 cm −1 after coordination with the The essential decrease of the IR intensities of out-of-plane CH modes is for the complex and explained by the lowering of the effective charge on olefinic protons due to back-donation from metal to ligand.

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