Copper(II) complexes derived from tripodal tris[(2-ethyl-(1-pyrazolyl)]amine

The tripod tris[2-ethyl(1-pyrazolyl)]amine (tepza) forms two series of copper(II) complexes: mono-nuclear: [Cu(tepza)X]ClO4 (X = Cl, 1; X = NCS, 2; X = dca, 3) and dinuclear bridging complexes [Cu2(tepza)2(μ-C4O4)](ClO4)2·H2O (4) and [Cu2(tepza)2(μ-C5O5)](ClO4)2 (5). The CuII centers in the solid complexes display a wide variety of geometries. Magnetic measurements reveal the weak antiferromagnetic coupling in complexes 4 and 5.