Photo-Inuced multielectron transfer in organic crystals with mixed-stack architecture

摘要

We discuss the photo-induced multielectron transfer in organic mixed-stack charge-transfer crystals, close to the neutral-ionic interface. The quasi-one-dimensional architecture of the stacks stimulates intermolecular electron transfer and the energy gain due to Coulomb interaction creates highly cooperative electronic excitations, the charge-transfer strigns. At the neutral-ionic interface charge-transfer exciton is no longer elementary excitation and a pair of neutral-ionic domain walls plays such a role. Photo-generated strings proliferates as a motion of lattice-relaxed neutral-ionic domain walls plays such a role. Photo-generated strings proliferates as a motion of lattice-relaxed neutral-ionic domain walls such a role. Photo-generated strings proliferates as a motion of lattice-relaxed neutral-ionic domain walls, a domino effect caused by electron-phonon coupling. We show that the cooperative multielectron transfer in tetrathiafulvalene-chloranil (TTF-CA) crystal can be photo-induced as bidirectional transition between neutral and ionic phases. Apart from many application-oriented aspects, the discussed phenomena, photo-induced cooperative multielectron transfer, may serve as a model for he electron-transfer self-organization, the frontier problem in natural sciences.