We report the structure-magnetic property relationship of layered metal(II)-based carboxylate compounds, which are shown to be suitable inorganic host lattices for the insertion of organic anions. Unprecedented ferromagnetic interactions are evidenced for distances as far as 40 Angstrom between metal layers. The properties of copper(II) n-alkyl carboxylates and cobalt(II)-iminonitroxide radical hybrid ferromagnets are discussed.