Molecular design of high spin polymers with ferromagnetic coupling among the electrons. Two types of 1-D π-conjugated polymers: Charge transfer and polaronic ferromagnets
Based on Anderson's general theory of magnetism, the sufficient con- ditions for the existence (arising) of high spin (HS) states with ferromagnetical coupling between the electrons within the half-filled band (HFB) in 1D infinite n-conjugated systems are described here. The structure and magnetic properties of two classes of HS systems are investigated. A). 1D polymers, in which charge transfer triplet biradicals are intrinsic parts of the polymer chain. B). The term dendralene is generalized for a large class of n-conjugated systems. In these systems the polaron (on a reductively or oxidatively doped n-fragment) is strictly localized in one elementary unit. This property, caused by the topology of the x- network, determines the good localization of the Wanniere states in a narrow HFB, and give rise to a HS ground state.