Synthesis, X-ray crystal structures and magnetic properties of Cu(II)(NITpPy) 2[N(CN) 2] 2·solv (NITpPy=nitronyl nitroxide radical, solv=H 2O or CH 3CN). From discrete molecules to 2-D polymeric coordination compounds

Abstract

The synthesis, X-ray crystal structures and magnetic properties of five new copper(II) complexes containing nitroxide radicals Cu(NITpPy) 2(NO 3) 2 ( 1), Cu(NITpPy) 2(CH 3COO) 2 ( 2), Cu(NITpPy) 2[N(CN) 2] 2·(H 2O) 2 ( 3), Cu(NITpPy) 2[N(CN) 2] 2·3CH 3CN ( 4) and Cu(NITpPy) 2[N(CN) 2] 2·2CH 3CN ( 5) are reported. Compounds 1– 3 consists of discrete molecules in the solid state, but in compounds 4 and 5 the Cu(NITpPy) 2 2+ units are connected through N(CN) 2 − bridging ligands in μ 2 coordination developing, respectively, into one-dimensional and two-dimensional polymeric networks. For all compounds, the magnetic properties have been investigated and antiferromagnetic interactions dominate at low temperature.