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DOI: 10.1039/A902465D (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 3029-3034

Magnetic properties of dinuclear copper(II) complexes with simple pyrazolate bridges

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Evgenia Spodine, Ana María Atria, Jorge Valenzuela, Jerzy Jalocha, Jorge Manzur, Ana María García, María Teresa Garland, Octavio Peña and Jean-Yves Saillard

Abstract

Three new copper(II) complexes with simple pyrazolate bridges have been prepared, [Cu2(pz)2(dpa)2(H2O)Cl]Cl·H2O 1, [Cu2(pz)2(phen)2Cl2]·2C2H5OH 2 and [Cu2(pz)(phen)2Cl3]·2H2O 3 (Hpz = pyrazole, dpa = di(2-pyridyl)amine, phen = 1,10-phenanthroline) and their crystal and molecular structures determined. The copper centres in the binuclear cation in 1 have a square pyramidal geometry at Cu1 and a distorted octahedral geometry at Cu2. The neutral complexes 2 and 3 have the copper atoms in a distorted square pyramidal geometry. Complexes 1 and 2 are bibridged by pyrazolate while 3 is monobridged by this ligand. Variable temperature magnetic studies on all three complexes indicate the existence of antiferromagnetic exchange phenomena (–2J = 191, 169, 42 cm–1 for 1, 2 and 3 respectively). Extended Hückel calculations showed a HOMO/LUMO gap which is in agreement with the experimental data.

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