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

Abstract

Halide salts of the unsymmetrically substituted o-DMTTF, formulated as (o-DMTTF)2X, 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)x(Cl)1-x and (o-DMTTF)2(Br)x(I)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)2(X)x(Y)1-x. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.