This thesis is based on the synthesis and characterization of transition metal dithiolates, as complexes and charge transfer salts, with a special relevance to their structural, magnetic and electrical characterization and the relationship between these properties. Following a general introduction, that will give a global perspective of some subjects in order to give a better understanding of the contents of this thesis, the synthesis and characterization of the compounds under study are described in detail. In chapter two and three is described the study of the family based on the ligand dicyanobenzene dithiolate and some transition metal M, general formula [M(dcbdt)2]-z, with a considerable large number of transition metal M = Au, Co, Cu, Fe, Ni, Pd, Pt e Zn. After the synthesis of the metal complexes, obtained as tetrabutyl ammonium salts in several oxidation states, Z = 2, 1 and 0.4, the characterization by several techniques as X-ray diffraction, cyclic voltammetry, EPR and magnetic susceptibility permitted a general view of the behavior of this family. A special attention to the electric transport proprieties was dedicated in the partial oxidized complexes, in chapter three. Chapter three is also dedicated to a series of charge transfer complexes with the organic donors TMTSF, BET-TTF, BMDT-TTF and BEDT-TTF and [M(dcbdt)2]- complexes. A detailed description of the general conditions in which they were obtained as well as their characterization by measurements of magnetic and electrical properties is done. Some charge transfer salts obtained with the same kind of donors and other metal transition dithiolates were also studied, with particular attention to their magnetic properties and its relation with molecular structure.