Key indicators: single-crystal X-ray study; T = 100 K; mean (C-C) = 0.003 Å; R factor = 0.033; wR factor = 0.084; data-to-parameter ratio = 18.0.The asymmetric unit of the title compound, [Fe 2 (C 5 H 5 ) 2 -(C 2 H 8 N 2 )(CO) 4 ](BF 4 ) 2 , contains two half-cations, each located on a center of symmetry, and two tetrafluoridoborate anions. The iron atoms adopt a three-legged piano-stool geometry. All amine H atoms are involved in N-HÁ Á ÁF hydrogen bonds, which consolidate the crystal packing along with weak C-HÁ Á ÁO and C-HÁ Á ÁF interactions.
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