Iron, carbonyl compounds infrared spectra

The photochemistry of the binuclear iron carbonyl [( -CsHslFe-(CO)2]a, VIII, provides another outstanding example of the interplay between time-resolved and alternative strategies (76). According to the infrared spectrum of this compound in a suitable matrix at low temperatures (83), ultraviolet photolysis results in the elimination of free CO, but the pronounced cage effect of the medium entirely sup-... 

The infrared spectrum (carbonyl region only) of the reaction product between triphenylcarbenium hexachloroantimonate and poly(1,3-octadienyliron tricarbonyl) is shown in Fig. 8. The spectrum shows four discrete peaks. The two at 2000 cm" and 2030 cm are from the unreactive trans diene iron tricarbonyl segments of the polymer and the two at 2085 cm" and 2120 cm" are due to the cationic pentadienyliron tricarbonyl segments in the polymer and correspond well with the peaks displayed by the model compound (Fig. 7). This then confirms the presence of cis/trans segments in poly(1,3-octadienyliron tricarbonyl). 

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