Molecular structures of three DABCO complexes of the half sandwich iron moiety [Cp(CO)2Fe] have been determined by single crystal X-ray crystallography. It has been shown that the dinuclear complex [{Cp(CO)2Fe}2(µ-DABCO)](BF4)2 crystallizes in different crystal systems with solvent molecules trapped in a crystalline lattice. The conformation of the coordinated DABCO in the mononuclear complex [Cp(CO)2Fe(DABCO)]BF4 differs significantly from that of the dinuclear complex.