[V 2 (Ant)] ∞ and [Cr 2 (Ant)] ∞ that are studied in this work, strong coupling between TMs and Ant within the energy range of -4 to 0 eV can be found [see Figs. 2(c) and 3(d)]. Furthermore, the wave functions at the Γ point of [V 2 (Ant)] ∞ and [Cr 2 (Ant)] ∞ near the Fermi level also confirm the strong TMs-Ant coupling. Therefore, by comparing CT and negative polarization effect, it can conclude that the DE may be mainly responsible for the ferromagnetism. Furthermore, Ant can be considered as a small piece of graphene (SPG) with multi-Bzs. SPG with more benzene rings, such as coronene and pentacene (Pe), can also be used for constructing this kind of sandwich like nanostructures and nanowires. As a matter of fact, the sandwich like TM-corroene polymers have already been synthesized.[21, 22] Such kind of polymers built with SPG and TMs may also be suitable materials for spintronic devices and information recording. Except for the properties of better stability and conductivity mentioned at the beginning, as shown in Figs. 4(a) and 4(b), TM-SPG polymers can be built into warped and branched strutures. In Fig. 4(a), the relaxed structure of Sc 4 V 4 (Ant) 5 cluster are shown. As the radius of Sc is larger than the that of V, Sc 4 V 4 (Ant) 5 cluster shows a warp structure. By co-doping and introducing TM defects, warped structure can be realized in this kind of sandwich polymers. Fig. 4(b) shows the schematic branched structure constructed with Pe, Bz and TMs. In fact, warped and branched structures already achieved in carbon nanotubes and nanowires[23, 24] are central to the design of nanodevices and nanocircuits. While the different shapes and versatile properties exhibited by the sandwich like TM-SPG nanostructures and nanowires may qualify them as promising building blocks for spintronics devices and information storage. As the HOMO-LUMO gap of SPG decrease with the size increase of SPG, the CT effects and magnetic behaviors in the [V 2 (Ant)] ∞ may also exists in TM-SPG. Thus, further experimental and theoretical investigations are highly suggested in this interesting field. In conclusion, the properties of [TM 2 (Ant)] ∞ are investigated by first principles calcula- tions. As the HOMO-LUMO gap of Ant is smaller than that of Bz, there is a large CT in [TM 2 (Ant)] ∞ , which results in different magnetic behaviors in [TM 2 (Ant)] ∞ from TM(Bz) ∞ . Especially, [V 2 (Ant)] ∞ and [Cr 2 (Ant)] ∞ exhibit 100% spin polarized DOS around Fermi level IV. CONCLUSION 6