Organic Mixed‐Valence Systems: Toward Fundamental Understanding of Charge/Spin Transfer Materials

Several topics on purely organic MV systems are highlighted after brief explanation on the basic concepts that are essential to understand the details of organic MV chemistry. Charge localization and delocalization on π-conjugated organic molecular systems are discussed in terms of key parameters: electronic coupling, reorganization energy, and activation barrier. In particular, correlation between bridging units and electronic coupling, topology of bridging pattern, through-bond and through-space pathway, and control of spin states through MV states are described while citing intriguing examples of organic MV molecular systems.