Oxidation reaction of [{Cu(Hpz) 2 Cl} 2 ](Hpz = pyrazole): synthesis of the trinuclear copper( II ) hydroxo complexes [Cu 3 (OH)(pz) 3 (Hpz) 2 Cl 2 ]·solv (solv = H 2 O or tetrahydrofuran). Formation, magnetic properties, and X-ray crystal structure of [Cu 3 (OH)(pz) 3 (py) 2 Cl 2 ]·py (py = pyridine)

The trinuclear copper(II) complexes [Cu3(OH)(pz)3(Hpz)2Cl2]·solv (Hpz = pyrazole, pz = pyrazolate anion, solv = H2O or tetrahydrofuran) have been obtained by oxidation reactions of [{Cu(Hpz)2Cl}2]. When treated with pyridine(py), both CuII derivatives gave the related compound [Cu3(OH)(pz)3-(py)2Cl2]·py, which has been characterized by a single-crystal X-ray structure analysis. Crystals are orthorhombic, space group Pnma(no. 62), a= 19.883(3), b= 15.063(3), c= 9.495(2)Å, Z= 4, R= 0.035 and R′= 0.041 for 1 472 absorption corrected reflections having I > 3σ(I).