The title compounds, propynylferrocene, [Fe(C5H5)(C8H7)], (I), and (phenylethynyl)ferrocene, [Fe(C5H5)(C13H9)], (II), are stabilized by weak C—H⋯π interactions. The C[triple‐bond]C bond distances in these molecules are in the range 1.182 (3)–1.192 (3) Å. In (II), the ferrocenyl and phenyl groups are perpendicular, making an angle of 89.06 (13)°, which is a rare occurrence.
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