π-d interaction-based molecular magnets in TTF-type salts

Structure, transport properties and magnetism of the following π-d systems based on TTF-type salts with magnetic ions are investigated. i)C ₁TET-TTF-FeBr₄: The magnetic anions form zigzag chains, whose property is described in terms of triangular-based ladder systems accompanied with weak ferromagnetism. Its magnetic properties are affected by the sulfur-to-selenium or bromine-to-chlorine substitution, ii) (EDO-TTFI ₂)₂M(mnt)₂ (M = Ni, Pt): Both donor and anion molecules form segregated one-dimensional columns, which are connected via short -CM⋯I- contacts. These salts show the coexistence of metallic conductivity on the donors and ferromagnetic interaction between localized moments on the anions. iii) (DMET)₂FeBr₄: The donor molecules form one-dimensional column with metallic conductivity, whereas the magnetic anions form square-lattice layers and show antiferromagnetic transition. The coincidence of the anomalies on magnetization curves and magnetoresistance supports the presence of π-d interaction between these two layers.