Charge transfer salts of tetrathiafulvalene derivatives with magnetic iron(III) oxalate complexes: [TTF](7)[Fe(ox)(3)](2)center dot 4H(2)O, [TTF](5)[Fe-2(ox)(5)]center dot 2PhMe center dot 2H(2)O and [TMTTF](4)[Fe-2(ox)(5)]center dot PhCN center dot 4H(2)O (TMTTF = tetramethyltetrathiafulvalene)

Three novel TTF (tetrathiafulvalene) and TMTTF (tetramethyltetrathiafulvale ne) radical salts of monomeric and dimeric iron(III) oxalate magnetic compl exes, [TTF](7)[Fe(ox)(3)](2). 4H(2)O 1, [TTF](5)[Fe-2(ox)(5)]. 2PhMe . 2H(2 )O 2 and [TMTTF](4)[Fe-2(ox)(5)]. PhCN . 4H(2)O 3, have been synthesized, a nd their structures and physical properties investigated. The structures fo r these semiconducting salts feature monodimensional stackings of the radic al cations interleaved by the complexes [Fe(ox)(3)](3-) and [Fe-2(ox)(5)](4 -), and solvent molecules. For the novel dinuclear complex [Fe-2(ox)(5)](4- ) antiferromagnetic exchange between the two iron atoms through the oxalate bridge was found.