Charge transfer salts based on M(dcbdt)2 complexes (M=Au and Ni)

Abstract

BEDT-TTF [Au(dcbdt) 2 ] and TMTSF [Co(dcbdt) 2 ] (dcbdt = 4,5-dicyanobenzene-1,2-dithiolate) were obtained as small single crystals by electrocrystallisation. BEDT-TTF [Au(dcbdt) 2 ] is triclinic, space group P1, and its structure consists in alternated donor acceptor stacks, responsible for electrical insulating properties. TMTSF [Co(dcbdt) 2 ] presents semiconducting properties with a relatively high electrical conductivity (σ RT ∼10-150 S/cm, E a =78 meV) and its thermopower (S RT ∼ 9 μV/K) has a temperature dependence suggesting a two band conduction mechanism.