Oxidation reaction of [{Cu(Hpz)2Cl}2](Hpz = pyrazole): synthesis of the trinuclear copper(II) hydroxo complexes [Cu3(OH)(pz)3(Hpz)2Cl2]·solv (solv = H2O or tetrahydrofuran). Formation, magnetic properties, and X-ray crystal structure of [Cu3(OH)(pz)3(py)2Cl2]·py (py = pyridine)

Abstract

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 Cu^II 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).