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Magnetic properties of dinuclear copper(II) complexes with simple pyrazolate bridges
Three new copper(II) complexes with simple pyrazolate bridges have been prepared, [Cu2(pz)2(dpa)2(H 2O)-Cl]Cl¡¤H2O 1, [Cu2(pz)2(phen)2Cl2]¡¤2C 2H5OH 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 Hueckel calculations showed a HOMO/LUMO gap which is in agreement with the experimental data.
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Reference£º
Tetrahydropyran – Wikipedia,
Tetrahydropyran – an overview | ScienceDirect Topics