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In the structure of the title compound, [Fe(C 5 H 5 )(C 6 H 12 N 4 )(CO) 2 ]BF 4 , the arrangement around the Fe II  atom corresponds to that of a three-legged piano stool. The cyclo­penta­dienyl ligand occupies three coordination sites of the apical position in a η 5  fashion, while two CO ligands and one N atom of the hexa­methyl­ene­tetra­mine ligand occupy the remaining coordination sites to complete a distorted octa­hedral geometry. The asymmetric unit consists of two sets of crystallographically independent cations and anions with the r.m.s. deviations of the overlay of non-H atoms of each pair being 0.081 and 0.120 Å, respectively. The Fe—N bond lengths are 2.0459 (15) and 2.0490 (14) Å, while the Fe—Cp(centroid) distances are 1.7257 (3) and 1.7246 (3) Å. One of the anions displays disorder, with the F atoms having occupancies of 0.58 (4) and 0.42 (4).

Dicarbonyl(η5-cyclopentadienyl)(hexamethylenetetramine-κN1)iron(II) tetrafluoridoborate

Dicarbonyl(η⁵-cyclopentadienyl)(hexamethylenetetramine-κN¹)iron(II) tetrafluoridoborate