Structural properties of solid solutions of the non-dimerized, 3/4-filled conductors (o-DMTTF) sub(2)X (X=Cl, Br, I)

Halide salts of the unsymmetrically substituted o-DMTTF, formulated as (o-DMTTF) sub(2)X, X=Cl, Br, I, are organized into uniform chains in a tetragonal structure with space group I-42d, providing a rare example of non-dimerized 3/4 filled system. Solid solutions formulated as (o-DMTTF)(Br) sub(x)(Cl) sub(1-x) and (o-DMTTF) sub(2)(Br) sub(x)(I) sub(1-x) have been prepared and structurally characterized. A systematic preferential bromide insertion is observed together with a lateral expansion of the structure with increasing anion size. Tetragonal (space group I-42d) structure of the halide salts of o-DMTTF, in solid solutions (o-DMTTF) sub(2)(X) sub(x)(Y) sub(1-x).