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Magnetic properties of dinuclear copper(II) complexes with a N6 pyridazine-derived ligand

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1997
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Spodine Spiridonova, Evgenia
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Magnetic properties of dinuclear copper(II) complexes with a N6 pyridazine-derived ligand
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Author
  • Spodine Spiridonova, Evgenia;
  • Atria Salas, Ana María;
  • Manzur Saffie, Jorge;
  • García, Ana;
  • Garland, María Teresa;
  • Hocquet, Alexandre;
  • Sanhueza, Eduardo;
  • Baggio, Ricardo;
  • Peña, Octavio;
  • Saillard, Jean;
Abstract
A new hexadentate ligand 3,6-bis[(6-methyl-2-pyridyl)(2-pyridyl)methyl]pyridazine (mbdpdz) was prepared by a condensation reaction of 3,6-dichloropyridazine and (6-methyl-2-pyridyl)(2-pyridyl)methyllithium, and the following binuclear copper(II) complexes were obtained: [Cu2(mbdpdz)Cl4] 1, [Cu2(mbdpdz)Br4] 2, [Cu2(mbdpdz)Cl2(OH)]Cl 3 and [Cu2(mbdpdz)Br2(OH)]Br 4. The crystal and molecular structures of the two isomorphous complexes 3 and 4 are reported. Both complexes crystallize in the monoclinic system, space group C2/c, with eight formula units per unit cell. Complex 3: a = 28.364(3), b = 13.511(1), c = 16.858(1) Å, β = 109.70(1)°. Complex 4: a = 28.528(5), b = 13.459(2), c = 17.348(3) Å, β = 109.35(1)°. The copper centres in the binuclear cation in 3 and 4 have a square-pyramidal geometry, with a bridging hydroxide angle of 115.1(3) and 116.2(5)° respectively. The Cu · · · Cu distance was 3.251(2) Å in both binuclear complexes. These hydroxo-bridged complexes were obtained by refluxing acetonitrile–water suspensions of 1 and 2, respectively. Variable-temperature magnetic studies on all complexes indicate the existence of antiferromagnetic exchange phenomena. Extended-Hückel calculations were performed on complexes 3 and 4 in order to identify the electronic origin of the spin coupling of these molecules.
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URI: https://repositorio.uchile.cl/handle/2250/158068
ISSN: 03009246
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