A dimeric Cu(II) acetate complex containing axially coordinated p-pyridyl nitronyl nitroxide radicals: [CuII(CH3COO)2(NITpPy)]2

Abstract

The synthesis, X-ray crystal structure, and magnetic behaviour of a new dimeric copper(II) compound, [Cu^II(CH₃COO)₂(NITpPy)]₂ , is described. This compound presents a Cu₂(COO)₄ cage in which two copper atoms are linked by CH₃COO⁻ anions, yielding a short Cu–Cu distance of 2.6236(12) Å. p-Pyridyl nitronyl nitroxide radicals are localised in the apical positions. The magnetic study shows a strong antiferromagnetic Cu–Cu intradimer interaction and intermolecular antiferromagnetic interactions between the radical units at very low temperature. A Cu(II)–Cu(II) interaction parameter of J = − 321 ± 1 cm⁻¹ was found.