Non-integral charge transfer in an organic metal: the structure and stability range of (TTF)Br_0.71-0.76

The organic metal (TTF)Br0.71-0.76 crystallizes in a monoclinic lattice comprised of mixed valence (0, +1) TTF molecules and Br- arranged in segregated stacks along the c-axis. Its structure can be viewed in terms of two separate, range of the salt was deduced from the composition dependence of the bromide sublattice parameters. The relationship of the unusual stoichiometry of (TTF)Br0.71-0.76 to the degree of charge transfer in 1 : 1 Π-donor/ TCNQ salts is examined and discussed. © 1975.