Abstract
Three kinds of imidazolate-bridged copper(II) complexes using pz3BH anion as a capping ligand, namely, [Cu4(μ-im)4(pz3BH)4][Cu(pz3BH)2]2 (1), polymorphic [Cu4(μ-im)4(pz3BH)4] (1t), and [Cu(μ-im)(pz3BH)]n (1p) were afforded (Him=imidazole; pz3BH=hydrotris(1-pyrazolyl)borate). Their crystal structures were determined to reveal that 1 and 1t involve a tetranuclear macrocycle while 1p consists of a polymeric chain. The im nitrogen atoms occupied the copper equatorial positions. The magnetic susceptibility measurements showed that the im bridges played the role of an antiferromagnetic coupler. The Bonner–Fisher model with the Heisenberg spin Hamiltonian as H=−Σ 2JSi·Si+1 gave 2J/kB=−115.5(6)K for 1p. The magnitude of the present interaction belongs to the largest class, when compared with those of the known im-bridged copper(II) complexes.
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