Properties of one-dimensional sandwich-like organometallic wires, [TM 2 (Ant)] 1 , constructed with transition metals (TM ¼ Sc, Ti, V, Cr, Mn, and Fe) and anthracene (Ant ¼ C14H10) are systematically investigated by first-principles calculations. Our results show that the properties of [TM 2 (Ant)] 1 are mainly determined by charge transfer and the magnetic properties in [TM 2 (Ant)] 1 are much more diverse than those in [TM(Bz)] 1 due to the fact that HOMO-LUMO gap of Ant is much smaller than that of benzene (Bz ¼ C6H6). In particular, [V 2 (Ant)] 1 and [Cr 2 (Ant)] 1 are found to be half-metallic ferromagnets, indicating that they are better than [TM(Bz)] 1 for spintronic devices due to high conductivity and stability. Furthermore, because the HOMO-LUMO gap of graphene flakes decreases with increasing size, the charge transfer effect may also manifest in sandwich-like wires based on graphene flakes and TM, which are also proposed to be potential candidates for spin transport. V