The crystal structure of the title compound, [Fe(C(5)H(5))(CH(3)CN)(CO)(2)]BF(4), of which only the coordinates of the non-H atoms of the cation have previously been reported [Fadel et al. (1979 ▶). Z. Anorg. Allg. Chem.453, 98-106] has been redetermined. The Fe(II) atom in the complex cation is coordinated by a cyclo-penta-dienyl ring, two carbonyl ligands and an acetonitrile mol-ecule displaying a three-legged piano stool structure. Three of the four F atoms of the BF(4) (-) anion are disordered over two sets of sites, with a site-occupancy factor of 0.709 (10) for the major occupied site.
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