Abstract
Abstract The crystal structure of the oxygen-bridged dimer formed between copper(II) bromide and 4-methylpyridine-1-oxide has been determined and refined to a final R value of 0.027. The dinuclear units crystallize in the monoclinic space group P2 1/c with dimensions: a = 6.086(1), b = 15.064(3), c = 10.469(2) Å, β = 106.14(1)°. Each Cu(II) ion is five coordinate with two bridging oxygen atoms and two bromine atoms in the square base and a bromine atom from an adjacent molecule in the apical site (Cu[sbnd]0 = 1.983(3), Cu[sbnd]0′ = 2.007(3), Cu[sbnd]Br(1) = 2.337(1), Cu[sbnd]Br(2) = 2.346(1), Cu[sbnd]Br(2)′′ = 3.272(1) Å). The temperature dependence of the magnetic susceptibilities shows strong antiferromagnetic coupling. The data fitting procedure to the Bleaney-Bowers-equation gives the parameters g = 2.05(2), 2J = -927(20)cm−1, Nα = 64(5) 10−6 c.g.s.u. Structural and magnetic properties are discussed in relation to those of the 1:1 complex formed between copper(II) bromide and pyridine-1-oxide.
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