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• W2045587767 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." @default.
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• W2045587767 date "1997-01-01" @default.
• W2045587767 modified "2023-10-16" @default.
• W2045587767 title "Magnetic properties of dinuclear copper(II) complexes with a N6 pyridazine-derived ligand *" @default.
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• W2045587767 doi "https://doi.org/10.1039/a703716c" @default.
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