Interplay between charge and structural ordering in mixed-valence biferrocenium salts

A model of charge and structural ordering in mixed-valence biferrocenium sa lts is proposed. The model involves electron transfer, the interaction of e ach cluster ion with full symmetric and nonsymmetric vibrations of the near est surrounding as well as intercluster dipole-dipole interaction. Differen t types of charge and structural ordering are shown to be possible. The int errelation between structural distortions and electron localization is reve aled. The role of local nonsymmetric vibrations in electron localization is considered. [S0163-1829(99)08025-X].