Vibrational spectra of solid tri-μ-carbonyl-(hexacarbonyl)di-iron(O), Fe2(CO)9

Laser Raman spectra of solid tri-μ-carbonyl(hexacarbonyl)di-iron(0), Fe₂,(CO)₉, have been recorded at 295, 100 and 15 K using a surface scanning technique to avoid sample decomposition. The data indicate that no phase change occurs throughout the temperature range studied. The room temperature IR spectrum of the solid was also investigated in the 700-350 cm^?1 region. The vibrational assignments proposed are in good agreement with the factor group predictions for the known P6_3/m (C_6h²) space group symmetry of the crystal.