A novel one-dimensional dicyanamide bridged lead(II) complex containing nitronyl nitroxide radicals: Syntheses, crystal structures, and magnetic properties

Abstract

A novel one-dimensional dicyanamide bridged lead(II) complex containing nitronyl nitroxide radicals, [Pb(NIT-1′-MeBzIm)(Dca)2] n (Dca = dicyanamide anion, NIT-1′-MeBzIm = 2-{2′-[(l′-methyl)benzimidazolyl]}-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), has been prepared and characterized by magnetic and single-crystal X-ray diffraction studies. In the complex, Pb2+ ion shows seven-coordinate geometry. A chain structure with single, symmetrical, end-to-end Dca bridges is found in the compound. These units develop as 1D species, where dicyanamide ligands bridge Pb2+ ions. Otherwise, molecules are linked by π-π-piling interactions to form 2D network structure. Magnetic investigation indicates the existence of intramolecular interactions, wich are ferromagnetic with J = 23.6 cm−1, where the spin Hamitonian is defined as H = −2Σ i,j J i,j S i S within the complex.