Intercalation of stable organic radicals into layered copper hydroxides

We report the intercalation of a stable organic radical, 3-carboxy-2,2,5,5- tetramethyl-1-pyrrolidine-1-oxyl anion (PROXYL-) into the layered copper hy droxides, Cu-2(OH)(3)(CH3CO2).H2O, by means of the anion exchange. The powd er X-ray diffractions reveal the anion exchange, showing an increase in the interlayer distance. However, the elemental analyses indicate that the obt ained material is Cu-2(OH)(3.5)(PROXYL)(0.5).H2O. The temperature dependenc e of the magnetic susceptibilities for the intercalation compound indicates a dominant antiferromagnetic interaction in contrast to the intralayer fer romagnetic interaction in the parent compound. The EPR spectra of the inter calation compound consist of the absorption of the organic radical, whose t emperature-variable follows the Curie law. The observed antiferromagnetic p roperties can be ascribed to a transition in the magnetic properties of the [Cu-2(OH)3](+) layer from ferromagnetic to antiferromagnetic upon intercal ation. (C) 2001 Elsevier Science BN. All rights reserved.