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The crystal structure of tricarbonyl(cinnamaldehyde)iron, C6HsCH=CH-CHO.Fe(CO)3, has been determined using molybdenum K~ radiation and counter techniques. Crystals are monoclinic with a= 9.723+0.010, b--7.116 + 0-007, c= 18.938_+0.018 A; fl= 115.05+0.15°; Z=4; space group P21/c. The tricarbonyl(cinnamaldehyde)iron must be considered as a zr complex. The two oxygen lone pairs do not play a part in the bonding with the metal and the structure is similar to that found in tricarbonyl-(Ncinnamylideneaniline)iron.