Magnetic properties are discussed for several TTF-based molecular magnets f
rom the viewpoints of pi-electron-based low-dimensional magnets and pi-d in
teraction systems. These are summarized with a Mott-Hubbard system with an
interplay of magnetism and electron transport (BEDT-TTF)(2)Br . CH2(OH)CH2O
H, a triangular-lattice spin frustration system (C1TET-TTF)(2)Br, a pi-elec
tron-mediated superexchange magnet BMT-TTFI2. FeX4 (X=Cl,Br), a 2D pi-d int
eraction system (BEDT-TTF)(3)CuBr4, and a metallic magnet (DMET)(2)FeBr4.