DT-TTF Salts with [Cu(dcdmp)2]−: The Richness of Different Stoichiometries

Abstract

(DT-TTF)[Cu(dcdmp)2] (1), (DT-TTF)2[Cu(dcdmp)2] (2), and (DT-TTF)3[Cu(dcdmp)2]2 (3) are three new charge transfer salts obtained by electrocrystallization of the donor DT-TTF (dithiophene-tetrathiafulvalene) with the diamagnetic copper complex [Cu(dcdmp)2]− (dcdmp = 2,3-dicyano-5,6-dimercaptopyrazine). Compounds 1 and 3 crystallize in the triclinic system and consist of out-of-registry layers of mixed stacks of donor and acceptor molecules. (DT-TTF)2[Cu(dcdmp)2] presents a structure similar to the parent spin-ladder systems with donor stacks arranged in pairs; however, a magnetic spin-ladder behavior is not observed probably due to strong interactions between pairs. Compound 3, despite the mixed nature of the stacks, displays relatively high conductivity (7 S/cm) due to a one-dimensional network of interactions between donors.