Tricarbonyl(η⁵-2,4-dimethylpentadienyl)iron Tetrafluoroborate

The title compound, [Fe(C₇H₁₁)(CO)₃]BF₄, has been found to exist in the expected piano-stool geometry, except that the unique carbonyl ligand is tilted towards the dienyl ligand by about 25° relative to the other carbonyl ligands. As in the case of the [Co(C₅H₅)(C₇H₁₁)]⁺ cation, a large difference appears to exist between the inter­nal C—C—C bond angles [129.1 (7) versus 122.1 (6)°] of the open dienyl ligand.

-1